The files PIMC_* contains the density along the x-direction obtained from PIMC calculations for different q/A combinations where the 3rd column contains the PIMC error bar.
qx1_qy0_qz0_A0.1 means, for example, q=2*pi/L*(1,0,0) -> q=0.84q_F, with A=0.1 (in Hartree).
The density is in units of n0=N/V and can plotted using the following python commands:
n_bin = 40.0 ### the number of points in a file
my_rs = 2.0 ### rs values
N = 14 ### the numebr of electrons in the main box
def n(rs):
return 1.0 / ( 4.0/3.0 *np.pi * pow(rs,3) )
def qf(rs):
return pow(9.0*0.25*np.pi,1.0/3.0) / rs
V = 1.0 / ( n(my_rs)/N )
fac = n_bin**2 /(V/n_bin) / n(my_rs)
path_qmc='qx2_qy0_qz0_A0.1/fermion_density_strip_14.res'
x_qmc, y_qmc, z_qmc = np.loadtxt(path_qmc, unpack=True)
x_qmc=(0.5+x_qmc)/n_bin
y_qmc=y_qmc*fac
z_qmc=z_qmc*fac
ax2.errorbar(x_qmc, y_qmc, z_qmc, fmt='s', mfc='white',mec='forestgreen', ecolor= 'forestgreen', ms=3, label='QMC data')