Dear Hamid,

You can use complex numbers in the ALPS applications.

Usually you need to set the parameter: COMPLEX=1
Then you can use “I” (capitol “i”) to define an imaginary number, e.g. J=1+2*I

The evaluation of observable should also work fine.


Best regards,
Michele

--
ETH Zurich
Michele Dolfi
Institute for Theoretical Physics
HIT G 32.4
Wolfgang-Pauli-Str. 27
8093 Zurich
Switzerland


+41 44 633 78 56 phone
+41 44 633 11 15 fax 





On Sep 3, 2015, at 3:32 PM, hamid mosadegh <hamid.mosadegh@gmail.com> wrote:

Dear All,

Is it possible to add imaginary term to Hamiltonian in DMRG calculations
or evaluate the expectation value of a  operator with imaginary part.

Thanks

--
H. Mosadeq
Shahr-e-Kord University (SKU),
Shahr-e-Kord , Iran