LATTICE="ch4x4";
MODEL="fHPRB";
LATTICE_LIBRARY="latt.xml";
MODEL_LIBRARY="models.xml";
COMPLEX=1;
t=1.0;
phi=3.141592654/4.0;
mu0=0.0;
mu1=0.0;
U0=0.0;
U1=0.0;
tl0=t*exp(I*phi);
tr0=t*exp(-I*phi);
tl1=1.0/(2.0+sqrt(2.0));
tr1=tl1;
tl2=-tl1;
tr2=-tr1;
tl3=1.0/(2.0+2.0*sqrt(2.0));
tr3=tl3;
CONSERVED_QUANTUMNUMBERS="N,Sz";
{N_total=1; Sz_total=1/2;}