toolbox/makechi
Introduction
The makechi code is often used to deal with the spin-spin correlation function (in imaginary time). It can output the magnetic susceptibility and effective magnetic moment. So far only the GARDENIA and NARCISSUS codes can build the spin-spin correlation function in imaginary time space. If the spin-spin correlation function is in frequency space, this code can not be used directly.
Spin-spin correlation function $\chi_{\text{spin}}(\tau)$:
\[\chi_{\text{spin}}(\tau) = \langle S_z(0) S_z(\tau)\rangle\]
Magnetic susceptibility $\chi_{\text{loc}}$:
\[\chi_{\text{loc}} = \int^{\beta}_0 d\tau \chi_{\text{spin}}(\tau)\]
Effective local magnetic moment $M_e$:
\[M_e = \sqrt{T\chi_{\text{loc}}}\]
Usage
$ ./mchi
Input
- See the terminal prompt
- solver.schi.dat (necessary)
Output
See the terminal output.
Comment
N/A