mirror of https://gitlab.com/QEF/q-e.git
153 lines
5.3 KiB
Modula-2
153 lines
5.3 KiB
Modula-2
input_description -distribution {Quantum ESPRESSO} -package PHonon -program q2r.x {
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toc {}
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intro {
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@b {Purpose of q2r.x:}
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It reads force constant matrices C(q) produced by the @b ph.x code
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for a grid of q-points and calculates the corresponding set
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of interatomic force constants (IFC), C(R)
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@b {Input data format:} [ ] = it depends
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@b {Structure of the input data:}
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========================================================================
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@b &INPUT
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...specs of namelist variables...
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@b /
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[ nr1 nr2 nr3
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nfile
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file(1)
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file(2)
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...
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file(nfile) ]
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}
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namelist INPUT {
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var fildyn -type CHARACTER {
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status { REQUIRED }
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info {
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Input file name (must be specified).
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@b "fildyn"0 contains information on the q-point grid
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@b "fildyn"1-N contain force constants C_n = C(q_n),
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where @b {n = 1,...N}, where N is the number of
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q-points in the irreducible brillouin zone.
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Normally this should be the same as specified on input
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to the phonon code.
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In the non collinear/spin-orbit case the files
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produced by @b ph.x are in .xml format. In this case
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@ref fildyn is the same as in the phonon code + the
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.xml extension.
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}
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}
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var flfrc -type CHARACTER {
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status { REQUIRED }
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info {
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Output file containing the IFC in real space (must be specified)
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}
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}
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var zasr -type CHARACTER {
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default { 'no' }
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options {
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info {
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Indicates the type of Acoustic Sum Rules used for the Born
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effective charges.
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Allowed values:
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}
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opt -val 'no' {
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no Acoustic Sum Rules imposed (default)
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}
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opt -val 'simple' {
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previous implementation of the asr used
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(3 translational asr imposed by correction of
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the diagonal elements of the force-constants matrix)
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}
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opt -val 'crystal' {
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3 translational asr imposed by optimized
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correction of the IFC (projection)
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}
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opt -val 'one-dim' {
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3 translational asr + 1 rotational asr
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imposed by optimized correction of the IFC (the
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rotation axis is the direction of periodicity; it
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will work only if this axis considered is one of
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the cartesian axis).
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}
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opt -val 'zero-dim' {
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3 translational asr + 3 rotational asr
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imposed by optimized correction of the IFC.
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}
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info {
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Note that in certain cases, not all the rotational asr
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can be applied (e.g. if there are only 2 atoms in a
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molecule or if all the atoms are aligned, etc.).
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In these cases the supplementary asr are cancelled
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during the orthonormalization procedure (see below).
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}
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}
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}
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var loto_2d -type LOGICAL {
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info {
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set to @b .true. to activate two-dimensional treatment
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of LO-TO splitting.
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}
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}
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}
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choose {
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when -test {file {fildyn}0 does not exist} {
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message {
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If a file @b "fildyn"0 is not found, the code will ignore variable
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@ref fildyn and will try to read from the following cards the missing
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information on the q-point grid and file names:
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}
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linecard {
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vargroup -type INTEGER {
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var nr1
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var nr2
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var nr3
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info {
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dimensions of the FFT grid formed by the q-point grid
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}
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}
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}
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card fileSpecs -nameless 1 {
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syntax {
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line {
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var nfile -type INTEGER {
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info {
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number of files containing C(q_n), n=1,@ref nfile
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}
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}
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}
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table file_n {
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rows -start 1 -end nfile {
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col file -type CHARACTER {
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info {
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names of the files containing C(q_n), n=1,@ref nfile
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Note that the name and order of files is not important as
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long as @b {q=0 is the first}.
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}
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}
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}
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}
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}
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}
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}
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}
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}
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