Dear ALPS users and developers,
I am a beginner of ALPS and English writing. I am studying Kondo lattice
model with alps dmrg application for python. I tried to calculate
correlation functions <S(i)S(j)> between local spins using 'Kondo
lattice' model and '2 band open chain lattice' ,which are in alps lib
and I didn't change anything. And I used the following parameter file:
parms = [ {
'LATTICE' : '2 band open chain
lattice',
'MODEL' : 'Kondo lattice',
'local_S' :0.5,
't' : 1,
'J' : 1,
'SWEEPS' : 4,
'NUMBER_EIGENVALUES' : 1,
'L' : 32,
'MAXSTATES' : 300,
'MEASURE_CORRELATIONS[Momentumup]' :'cdag_up:c_up',
'MEASURE_CORRELATIONS[Momentumdown]' :'cdag_down:c_down',
'MEASURE_AVERAGE[Magnetization]' : 'Sz',
'MEASURE_AVERAGE[Exchange]' : 'exchange',
'MEASURE_LOCAL[Local magnetization]' : 'Sz',
'MEASURE_CORRELATIONS[Diagonal spin correlations]' : 'Sz',
'MEASURE_CORRELATIONS[Offdiagonal spin correlations]' : 'Splus:
Sminus'
} ]
However, dmrg doesn't run and returned the error "Cannot evaluate
expression c_down(j)". This might be a foolish question, but I have no
idea. So, could you give me some advice? Any advice will help me.
Best regards,
Riku Masui