Dear Héctor,
Currently the only way is to define a new model where more sites are fused into one. As you may guess this is not very efficient, and I think is does not scale very well in case of 2d lattices.
We will soon release a new code where such Hamiltonians will be available.
Best regards, Michele
-- ETH Zurich Michele Dolfi Institute for Theoretical Physics HIT G 32.4 Wolfgang-Pauli-Str. 27 8093 Zurich Switzerland
dolfim@phys.ethz.ch www.itp.phys.ethz.ch
+41 44 633 78 56 phone +41 44 633 11 15 fax
On 26-feb-2014, at 20:36, Hector Diego Rosales rosales@fisica.unlp.edu.ar wrote:
Dear ALPS users,
I have two questions related with the DMRG method: (i) Does anybody know whether three and four body interactions terms can be readily implemented in the DMRG code ? If so, (ii) is that algorithm suitable for such type of couplings ?
Thanks in advance
-- Dr. Héctor Diego Rosales
CONICET IFLP - Dto. de Física UNLP, Casilla de Correos 67 Calle 49 y 115 s/n, 1900 La Plata, Argentina Tel +54 221 4246062 Fax +54 221 4236335 e-Mail: rosales@fisica.unlp.edu.ar