Do you really consider a t-J model? A t-J model with two electrons on two sites is just a Heisenberg model.

Matthias Troyer

On 30 Dec 2013, at 17:16, Elton Nascimento emn@fis.ufal.br wrote:

Dear Matthias Troyer

Thanks for you attention. You are right on your first option, that is exactly I have: a complex lattice with two sites per unit cell and I must ensure exactly two particles per unit cell.

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Today's Topics:

1. Re: Constraints for a unit cell (Matthias Troyer)

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Message: 1 Date: Sun, 29 Dec 2013 15:37:02 +0100 From: Matthias Troyer troyer@phys.ethz.ch To: ALPS user list comp-phys-alps-users@lists.phys.ethz.ch Subject: Re: [ALPS-users] Constraints for a unit cell Message-ID: 1FC5704D-82EB-4A08-A16F-08376885EA58@phys.ethz.ch Content-Type: text/plain; charset=iso-8859-1

Hi,

what do you mean by 2-site unit cell? Do you have a complex lattice with two sites per unit cell and you want to have exactly two particles per unit cell, or do you want to have two particles in total on the whole lattice?

On 28 Dec 2013, at 16:59, Elton Nascimento emn@fis.ufal.br wrote:

...

Dear All

How can I constrain the particle numbers of a 2-sites unit cell for a constant N=2? I am trying to obtain local magnetization using DMRG application and t-J model.

Thanks everybody.

Elton M. Nascimento Instituto de F?sica - UFAL-Brazil

End of Comp-phys-alps-users Digest, Vol 93, Issue 11

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