Matrix Product Toolkit | Tools / MpLocalCorrelation

This tool calculates efficiently a two-point correlation function.

Matrix Product Toolkit version HEAD-0.7.4.0 (subversion tree rev 802)
Compiled on Dec 10 2007 at 11:46:53
usage: mp-localcorrelation <lattice> <psi> <operator1> <first> <operator2> <last>

This program works similarly to MpCorrelation, except that it works directly with local operators. That is, the operators must be defined in the SiteBlock of the model. In addition, unlike MpCorrelation the site labels here are raw indices of the n^th A-matrix, NOT the coordinates that are defined by the lattice. For 1D models where the coordinates are simply 1,2,..., this makes no difference.

MpLocalCorrelation calculates all correlators < operator1(i) * operator2(j) > for all indices first <= i < j <= last. It does this rather efficiently, in just a single sweep. NOTE: Unlike mp-correlation, this program does not take fermion signs into account. It will give the wrong results for fermionic operators.

MpLocalCorrelation

See also