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FMcoeff.cpp
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FMcoeff.cpp
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#include<cmath>
#include<complex>
using namespace std;
complex<double> im = complex<double>(0.0,1.0);
double Hgfac = -2.00231930436;
double Hmu = 5.7883818066e-5 * 1000; // meV T^-1
//Sx_Q|GS>
complex<double> ax(double Jy, double Jx, double Jz, int j, double C[])
{
return 0.5*( exp(im*C[j]) - ( 1.0 + exp(im*2.0*C[j]) )*( (Jy - Jx)/(4.0*Jz) ) );
}
complex<double> bx(double Jz, double B, int j, double C[])
{
return -0.5 * ((Hgfac*Hmu*B)/(2.0*Jz)) * ( exp(im*C[j]) + exp(im*2.0*C[j]) );
}
complex<double> cx(double Jy, double Jx, double Jz, int j, double C[])
{
return -0.5 * ( (Jy - Jx)/(4.0*Jz) ) * ( exp(im*C[j]) + exp(im*3.0*C[j]) );
}
//Sy_Q|GS>
complex<double> ay(double Jy, double Jx, double Jz, int j, double C[])
{
return -0.5*im*( -exp(im*C[j]) + ( -(Jy - Jx)/(4.0*Jz) ) * ( 1.0 + exp(im*2.0*C[j]) ) );
}
complex<double> by( double Jz, double B, int j, double C[])
{
return -0.5*im*( (-Hgfac*Hmu*B)/(2.0*Jz) )*(-1.0)*( exp(im*C[j]) + exp(im*2.0*C[j]) );
}
complex<double> cy(double Jy, double Jx, double Jz, int j, double C[])
{
return -0.5*im*( -(Jy - Jx)/(4.0*Jz) ) * (-1.0) * ( exp(im*C[j]) + exp(im*3.0*C[j]) );
}
//Sz_Q|GS>
complex<double> az( double Jz, double B, int j, double C[])
{
return -( (-Hgfac*Hmu*B)/(2.0*Jz) ) * exp(im*C[j]);
}
complex<double> bz(double Jy, double Jx, double Jz, int j, double C[])
{
return ( -(Jy - Jx)/(4.0*Jz) ) * (-1.0) * ( exp(im*C[j]) + exp(im*2.0*C[j]) );
}