Why do you expect it to be 4.5? You have 20 bonds on which there is a coupling J1.
Matthias
On Mar 24, 2015, at 15:23, Valentin Sinitsyn valentin.sinitsyn@urfu.ru wrote:
Hi Matthias,
On 25.03.2015 01:38, Matthias Troyer wrote: Can you please tell me which energy you would expect for that lattice based on other means? I will then look into it
For L=6, as in params below, I'd expect ground state energy around 4.5*J1. However, sparsediag yields -10.1*J1.
Thanks, Valentine