On 29 April 2011 13:41, Matthias Troyer troyer@phys.ethz.ch wrote:
On Apr 29, 2011, at 11:29 AM, Oles Zaburannyi wrote:
Hello,
I have question about multi-site terms support in hamiltonian definition. I found some mention about that in ALPS workshop (2006) In recent wiki announced that `Extensions to more complex terms, such as 3- and 4-site terms are in preparation and will be included here as soon as the ALPS libraries support such terms.`
There is possibility to include now such terms?
Not yet - we need to find someone to code it. This will not be hard but someone needs to do it.
Ok, thanks. I have downloaded sources, but estimate my chances as rather
small.
Will arise huge problems in DMRG methods after including such milti-site
terms?
No, why should there be huge problems?
I don't know, just asking.
I take a look at lattice and hamiltonian definition. Why we can't define lattice unit with two quantum numbers s1z and s2z and define s_i s_{i+1} s_{i+2} as follows for odd $i$ by acting on quantum numbers in single unit cell (siteterm) and for even $i$ by acting on quantum numbers for two unit cells (bondterm)
Oles
Matthias