[Wannier] hopping parameters

[danilo Puggioni]

Dear Wannier90 users, I am beginner in using Wannier90 code.
I have a question about the hopping parameters that I can extract from the
Hamiltonian.
These parameters in my hamiltonian are complex. Is it correct? In PRB 56,
12847 Marzari and Vanderbilt conjecture that optimally localized Wannier
functions are alway real then I suppose that the hopping parameter must be
real.
Thanks

Danilo
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Danilo Puggioni - e-mail: puggioni at dsf.unica.it
Dipartimento Scienze Fisiche -  Universita' di Cagliari
Phone:   +39-0706754840
Complesso Universitario di Monserrato - S.P. Monserrato-Sestu Km 0.700
I-09042 Monserrato (CA) - Italy
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