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<title>pair_style eff/cut command — LAMMPS 15 May 2015 version documentation</title>
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<li>pair_style eff/cut command</li>
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<div class="section" id="pair-style-eff-cut-command">
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<span id="index-0"></span><h1>pair_style eff/cut command<a class="headerlink" href="#pair-style-eff-cut-command" title="Permalink to this headline">¶</a></h1>
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<div class="section" id="syntax">
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<h2>Syntax<a class="headerlink" href="#syntax" title="Permalink to this headline">¶</a></h2>
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<div class="highlight-python"><div class="highlight"><pre>pair_style eff/cut cutoff keyword args ...
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</pre></div>
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</div>
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<ul class="simple">
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<li>cutoff = global cutoff for Coulombic interactions</li>
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<li>zero or more keyword/value pairs may be appended</li>
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</ul>
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<pre class="literal-block">
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keyword = <em>limit/eradius</em> or <em>pressure/evirials</em> or <em>ecp</em>
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<em>limit/eradius</em> args = none
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<em>pressure/evirials</em> args = none
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<em>ecp</em> args = type element type element ...
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type = LAMMPS atom type (1 to Ntypes)
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element = element symbol (e.g. H, Si)
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</pre>
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</div>
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<div class="section" id="examples">
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<h2>Examples<a class="headerlink" href="#examples" title="Permalink to this headline">¶</a></h2>
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<div class="highlight-python"><div class="highlight"><pre>pair_style eff/cut 39.7
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pair_style eff/cut 40.0 limit/eradius
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pair_style eff/cut 40.0 limit/eradius pressure/evirials
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pair_style eff/cut 40.0 ecp 1 Si 3 C
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pair_coeff * *
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pair_coeff 2 2 20.0
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pair_coeff 1 s 0.320852 2.283269 0.814857
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pair_coeff 3 p 22.721015 0.728733 1.103199 17.695345 6.693621
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</pre></div>
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</div>
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</div>
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<div class="section" id="description">
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<h2>Description<a class="headerlink" href="#description" title="Permalink to this headline">¶</a></h2>
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<p>This pair style contains a LAMMPS implementation of the electron Force
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Field (eFF) potential currently under development at Caltech, as
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described in <a class="reference internal" href="#jaramillo-botero"><span>(Jaramillo-Botero)</span></a>. The eFF for Z<6
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was first introduced by <a class="reference internal" href="#su"><span>(Su)</span></a> in 2007. It has been extended to
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higher Zs by using effective core potentials (ECPs) that now cover up
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to 2nd and 3rd row p-block elements of the periodic table.</p>
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<p>eFF can be viewed as an approximation to QM wave packet dynamics and
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Fermionic molecular dynamics, combining the ability of electronic
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structure methods to describe atomic structure, bonding, and chemistry
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in materials, and of plasma methods to describe nonequilibrium
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dynamics of large systems with a large number of highly excited
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electrons. Yet, eFF relies on a simplification of the electronic
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wavefunction in which electrons are described as floating Gaussian
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wave packets whose position and size respond to the various dynamic
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forces between interacting classical nuclear particles and spherical
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Gaussian electron wavepackets. The wavefunction is taken to be a
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Hartree product of the wave packets. To compensate for the lack of
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explicit antisymmetry in the resulting wavefunction, a spin-dependent
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Pauli potential is included in the Hamiltonian. Substituting this
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wavefunction into the time-dependent Schrodinger equation produces
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equations of motion that correspond - to second order - to classical
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Hamiltonian relations between electron position and size, and their
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conjugate momenta. The N-electron wavefunction is described as a
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product of one-electron Gaussian functions, whose size is a dynamical
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variable and whose position is not constrained to a nuclear
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center. This form allows for straightforward propagation of the
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wavefunction, with time, using a simple formulation from which the
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equations of motion are then integrated with conventional MD
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algorithms. In addition to this spin-dependent Pauli repulsion
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potential term between Gaussians, eFF includes the electron kinetic
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energy from the Gaussians. These two terms are based on
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first-principles quantum mechanics. On the other hand, nuclei are
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described as point charges, which interact with other nuclei and
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electrons through standard electrostatic potential forms.</p>
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<p>The full Hamiltonian (shown below), contains then a standard
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description for electrostatic interactions between a set of
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delocalized point and Gaussian charges which include, nuclei-nuclei
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(NN), electron-electron (ee), and nuclei-electron (Ne). Thus, eFF is a
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mixed QM-classical mechanics method rather than a conventional force
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field method (in which electron motions are averaged out into ground
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state nuclear motions, i.e a single electronic state, and particle
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interactions are described via empirically parameterized interatomic
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potential functions). This makes eFF uniquely suited to simulate
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materials over a wide range of temperatures and pressures where
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electronically excited and ionized states of matter can occur and
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coexist. Furthermore, the interactions between particles -nuclei and
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electrons- reduce to the sum of a set of effective pairwise potentials
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in the eFF formulation. The <em>eff/cut</em> style computes the pairwise
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Coulomb interactions between nuclei and electrons (E_NN,E_Ne,E_ee),
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and the quantum-derived Pauli (E_PR) and Kinetic energy interactions
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potentials between electrons (E_KE) for a total energy expression
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given as,</p>
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<img alt="_images/eff_energy_expression.jpg" class="align-center" src="_images/eff_energy_expression.jpg" />
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<p>The individual terms are defined as follows:</p>
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<img alt="_images/eff_KE.jpg" class="align-center" src="_images/eff_KE.jpg" />
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<img alt="_images/eff_NN.jpg" class="align-center" src="_images/eff_NN.jpg" />
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<img alt="_images/eff_Ne.jpg" class="align-center" src="_images/eff_Ne.jpg" />
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<img alt="_images/eff_ee.jpg" class="align-center" src="_images/eff_ee.jpg" />
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<img alt="_images/eff_Pauli.jpg" class="align-center" src="_images/eff_Pauli.jpg" />
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<p>where, s_i correspond to the electron sizes, the sigmas i’s to the
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fixed spins of the electrons, Z_i to the charges on the nuclei, R_ij
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to the distances between the nuclei or the nuclei and electrons, and
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r_ij to the distances between electrons. For additional details see
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<a class="reference internal" href="#jaramillo-botero"><span>(Jaramillo-Botero)</span></a>.</p>
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<p>The overall electrostatics energy is given in Hartree units of energy
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by default and can be modified by an energy-conversion constant,
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according to the units chosen (see <a class="reference internal" href="units.html"><em>electron_units</em></a>). The
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cutoff Rc, given in Bohrs (by default), truncates the interaction
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distance. The recommended cutoff for this pair style should follow
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the minimum image criterion, i.e. half of the minimum unit cell
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length.</p>
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<p>Style <em>eff/long</em> (not yet available) computes the same interactions as
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style <em>eff/cut</em> except that an additional damping factor is applied so
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it can be used in conjunction with the
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<a class="reference internal" href="kspace_style.html"><em>kspace_style</em></a> command and its <em>ewald</em> or <em>pppm</em>
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option. The Coulombic cutoff specified for this style means that
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pairwise interactions within this distance are computed directly;
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interactions outside that distance are computed in reciprocal space.</p>
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<p>This potential is designed to be used with <a class="reference internal" href="atom_style.html"><em>atom_style electron</em></a> definitions, in order to handle the
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description of systems with interacting nuclei and explicit electrons.</p>
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<p>The following coefficients must be defined for each pair of atoms
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types via the <a class="reference internal" href="pair_coeff.html"><em>pair_coeff</em></a> command as in the examples
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above, or in the data file or restart files read by the
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<a class="reference internal" href="read_data.html"><em>read_data</em></a> or <a class="reference internal" href="read_restart.html"><em>read_restart</em></a>
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commands, or by mixing as described below:</p>
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<ul class="simple">
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<li>cutoff (distance units)</li>
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</ul>
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<p>For <em>eff/cut</em>, the cutoff coefficient is optional. If it is not used
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(as in some of the examples above), the default global value specified
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in the pair_style command is used.</p>
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<p>For <em>eff/long</em> (not yet available) no cutoff will be specified for an
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individual I,J type pair via the <a class="reference internal" href="pair_coeff.html"><em>pair_coeff</em></a> command.
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All type pairs use the same global cutoff specified in the pair_style
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command.</p>
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<hr class="docutils" />
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<p>The <em>limit/eradius</em> and <em>pressure/evirials</em> keywrods are optional.
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Neither or both must be specified. If not specified they are unset.</p>
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<p>The <em>limit/eradius</em> keyword is used to restrain electron size from
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becoming excessively diffuse at very high temperatures were the
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Gaussian wave packet representation breaks down, and from expanding as
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free particles to infinite size. If unset, electron radius is free to
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increase without bounds. If set, a restraining harmonic potential of
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the form E = 1/2k_ss^2 for s > L_box/2, where k_s = 1 Hartrees/Bohr^2,
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is applied on the electron radius.</p>
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<p>The <em>pressure/evirials</em> keyword is used to control between two types
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of pressure computation: if unset, the computed pressure does not
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include the electronic radial virials contributions to the total
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pressure (scalar or tensor). If set, the computed pressure will
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include the electronic radial virial contributions to the total
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pressure (scalar and tensor).</p>
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<p>The <em>ecp</em> keyword is used to associate an ECP representation for a
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particular atom type. The ECP captures the orbital overlap between a
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core pseudo particle and valence electrons within the Pauli repulsion.
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A list of type:element-symbol pairs may be provided for all ECP
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representations, after the “ecp” keyword.</p>
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<div class="admonition warning">
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<p class="first admonition-title">Warning</p>
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<p class="last">Default ECP parameters are provided for C, N, O, Al,
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and Si. Users can modify these using the pair_coeff command as
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exemplified above. For this, the User must distinguish between two
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different functional forms supported, one that captures the orbital
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overlap assuming the s-type core interacts with an s-like valence
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electron (s-s) and another that assumes the interaction is s-p. For
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systems that exhibit significant p-character (e.g. C, N, O) the s-p
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form is recommended. The “s” ECP form requires 3 parameters and the
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“p” 5 parameters.</p>
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</div>
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<div class="admonition warning">
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<p class="first admonition-title">Warning</p>
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<p class="last">there are two different pressures that can be reported
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for eFF when defining this pair_style, one (default) that considers
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electrons do not contribute radial virial components (i.e. electrons
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treated as incompressible ‘rigid’ spheres) and one that does. The
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radial electronic contributions to the virials are only tallied if the
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flexible pressure option is set, and this will affect both global and
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per-atom quantities. In principle, the true pressure of a system is
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somewhere in between the rigid and the flexible eFF pressures, but,
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for most cases, the difference between these two pressures will not be
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significant over long-term averaged runs (i.e. even though the energy
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partitioning changes, the total energy remains similar).</p>
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</div>
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<hr class="docutils" />
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<div class="admonition warning">
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<p class="first admonition-title">Warning</p>
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<p class="last">This implemention of eFF gives a reasonably accurate
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description for systems containing nuclei from Z = 1-6 in “all
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electron” representations. For systems with increasingly
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non-spherical electrons, Users should use the ECP representations.
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ECPs are now supported and validated for most of the 2nd and 3rd row
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elements of the p-block. Predefined parameters are provided for C, N,
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O, Al, and Si. The ECP captures the orbital overlap between the core
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and valence electrons (i.e. Pauli repulsion) with one of the
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functional forms:</p>
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</div>
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<img alt="_images/eff_ECP1.jpg" class="align-center" src="_images/eff_ECP1.jpg" />
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<img alt="_images/eff_ECP2.jpg" class="align-center" src="_images/eff_ECP2.jpg" />
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<p>Where the 1st form correspond to core interactions with s-type valence
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electrons and the 2nd to core interactions with p-type valence
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electrons.</p>
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<p>The current version adds full support for models with fixed-core and
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ECP definitions. to enable larger timesteps (i.e. by avoiding the
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high frequency vibrational modes -translational and radial- of the 2 s
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electrons), and in the ECP case to reduce the increased orbital
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complexity in higher Z elements (up to Z<18). A fixed-core should be
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defined with a mass that includes the corresponding nuclear mass plus
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the 2 s electrons in atomic mass units (2x5.4857990943e-4), and a
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radius equivalent to that of minimized 1s electrons (see examples
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under /examples/USER/eff/fixed-core). An pseudo-core should be
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described with a mass that includes the corresponding nuclear mass,
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plus all the core electrons (i.e no outer shell electrons), and a
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radius equivalent to that of a corresponding minimized full-electron
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system. The charge for a pseudo-core atom should be given by the
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number of outer shell electrons.</p>
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<p>In general, eFF excels at computing the properties of materials in
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extreme conditions and tracing the system dynamics over multi-picosend
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timescales; this is particularly relevant where electron excitations
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can change significantly the nature of bonding in the system. It can
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capture with surprising accuracy the behavior of such systems because
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it describes consistently and in an unbiased manner many different
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kinds of bonds, including covalent, ionic, multicenter, ionic, and
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plasma, and how they interconvert and/or change when they become
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excited. eFF also excels in computing the relative thermochemistry of
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isodemic reactions and conformational changes, where the bonds of the
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reactants are of the same type as the bonds of the products. eFF
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assumes that kinetic energy differences dominate the overall exchange
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energy, which is true when the electrons present are nearly spherical
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and nodeless and valid for covalent compounds such as dense hydrogen,
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hydrocarbons, and diamond; alkali metals (e.g. lithium), alkali earth
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metals (e.g. beryllium) and semimetals such as boron; and various
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compounds containing ionic and/or multicenter bonds, such as boron
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dihydride.</p>
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<hr class="docutils" />
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<p><strong>Mixing, shift, table, tail correction, restart, rRESPA info</strong>:</p>
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<p>For atom type pairs I,J and I != J, the cutoff distance for the
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<em>eff/cut</em> style can be mixed. The default mix value is <em>geometric</em>.
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See the “pair_modify” command for details.</p>
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<p>The <a class="reference internal" href="pair_modify.html"><em>pair_modify</em></a> shift option is not relevant for
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these pair styles.</p>
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<p>The <em>eff/long</em> (not yet available) style supports the
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<a class="reference internal" href="pair_modify.html"><em>pair_modify</em></a> table option for tabulation of the
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short-range portion of the long-range Coulombic interaction.</p>
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<p>These pair styles do not support the <a class="reference internal" href="pair_modify.html"><em>pair_modify</em></a>
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tail option for adding long-range tail corrections to energy and
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pressure.</p>
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<p>These pair styles write their information to <a class="reference internal" href="restart.html"><em>binary restart files</em></a>, so pair_style and pair_coeff commands do not need
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to be specified in an input script that reads a restart file.</p>
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<p>These pair styles can only be used via the <em>pair</em> keyword of the
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<a class="reference internal" href="run_style.html"><em>run_style respa</em></a> command. They do not support the
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<em>inner</em>, <em>middle</em>, <em>outer</em> keywords.</p>
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</div>
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<hr class="docutils" />
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<div class="section" id="restrictions">
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<h2>Restrictions<a class="headerlink" href="#restrictions" title="Permalink to this headline">¶</a></h2>
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<p>These pair styles will only be enabled if LAMMPS is built with the
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USER-EFF package. It will only be enabled if LAMMPS was built with
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that package. See the <a class="reference internal" href="Section_start.html#start-3"><span>Making LAMMPS</span></a>
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section for more info.</p>
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<p>These pair styles require that particles store electron attributes
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such as radius, radial velocity, and radital force, as defined by the
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<a class="reference internal" href="atom_style.html"><em>atom_style</em></a>. The <em>electron</em> atom style does all of
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this.</p>
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<p>Thes pair styles require you to use the <a class="reference internal" href="comm_modify.html"><em>comm_modify vel yes</em></a> command so that velocites are stored by ghost
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atoms.</p>
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</div>
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<div class="section" id="related-commands">
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<h2>Related commands<a class="headerlink" href="#related-commands" title="Permalink to this headline">¶</a></h2>
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<p><a class="reference internal" href="pair_coeff.html"><em>pair_coeff</em></a></p>
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</div>
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<div class="section" id="default">
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<h2>Default<a class="headerlink" href="#default" title="Permalink to this headline">¶</a></h2>
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<p>If not specified, limit_eradius = 0 and pressure_with_evirials = 0.</p>
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<hr class="docutils" />
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<p id="su"><strong>(Su)</strong> Su and Goddard, Excited Electron Dynamics Modeling of Warm
|
|
Dense Matter, Phys Rev Lett, 99:185003 (2007).</p>
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|
<p id="jaramillo-botero"><strong>(Jaramillo-Botero)</strong> Jaramillo-Botero, Su, Qi, Goddard, Large-scale,
|
|
Long-term Non-adiabatic Electron Molecular Dynamics for Describing
|
|
Material Properties and Phenomena in Extreme Environments, J Comp
|
|
Chem, 32, 497-512 (2011).</p>
|
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