Dear All,
I'm using DMRG (bose-hubbard) with complex tunneling amplitudes, the hamiltonian being hermitian, of course. The results in simple situation is reasonable, i.e. the energy and local density are invariant by local U(1) transformation. In addition, I am measuring the ODLRO, i.e. I have the following line in the input file:
'MEASURE_CORRELATIONS[ODLRO]' : "bdag:b",
However, the results are always real numbers, whereas I would expect complex numbers. Do they correspond to the real part of the correlation function? Is there a way to get the imaginary part? thank you for you help.
my version of alps is: alps-2.1.1-r6176
regards,
Benoît Grémaud