def plot_band(alpha,Vz,Delta,t=1.,mu=0.,nsite=100): ''' show the meanfield band. ''' model=RashbaModel(U=0.,alpha=alpha,Vz=Vz,Delta=Delta,t=t,mu=mu,nsite=nsite,periodic=True,kspace=True) hgen=model.hgen kl=hgen.kspace.kmesh-pi hkmesh=hgen.gethkmesh(kl) hmesh=Hmesh(hkmesh) print hmesh.check_hermicity() ekmesh=hmesh.getemesh() LABELSIZE=14 ion() fig=figure(figsize=(7,5)) plot(kl[:,0],ekmesh) if True:#hgen.spaceconfig.nnambu==1: axhline(y=0,ls='--',color='k') text(1.8,-0.1,'$\mu=0$',ha='center',va='center',fontsize=14) if Vz==0 and alpha!=0: dy=alpha**2/2 annotate('',xy=(-alpha,-2*dy),xycoords='data',xytext=(alpha,-2*dy),\ arrowprops=dict(arrowstyle='<->',shrinkA=0,shrinkB=0)) plot([-alpha,-alpha],[-dy-0.1,-dy+0.1],color='k',ls='-') plot([alpha,alpha],[-dy-0.1,-dy+0.1],color='k',ls='-') text(0,-2*dy-0.1,r'$2\alpha$',va='center',ha='center',fontsize=14) xlabel(r'$k$',fontsize=LABELSIZE) ylabel('Energy($t$)') xlim(-pi,pi) xticks([-pi,0,pi],[r'$-\pi/a$','0',r'$-\pi/a$'],fontsize=14) tight_layout() pdb.set_trace() savefig('data/band_%s.png'%model.get_str())
def plot_band(delta=0.1,t=1.,mu=0.,nsite=100): ''' show the meanfield band. ''' model=SSHModel(t=t,mu=mu,delta=delta,nsite=nsite,periodic=True,kspace=True) hgen=model.hgen kl=hgen.kspace.kmesh-pi hkmesh=hgen.gethkmesh(kl) hmesh=Hmesh(hkmesh) print hmesh.check_hermicity() ekmesh=hmesh.getemesh() ion() plot(kl[:,0],ekmesh) pdb.set_trace()