We have not implemented that yet. The workaround is to combine two sites into one, with more states. Then the 3-site term becomes a 2-site term
Best regards
Matthias
On Aug 29, 2018, at 10:13 AM, Julien DESPRES julien.despres@institutoptique.fr wrote:
Dear ALPS community,
I was wondering if it is possible to define an interaction involving three different lattice sites (for a 1D lattice model to perform dmrg calculations). To clarify, an example would be to construct the term \sum_i n_i n_{i+1} n_{i-1}. I checked in the doc if anyone had already the same kind of problem but it seems not. I guess that the solution is to build a bond term in the definition of the Hamiltonian by specifying the source and targets and to modify accordingly the lattice. Or is there a trick to specify one source (i) and two targets (i+1, i-1) ?
Thanks in advance, Julien
Ps : Just realized that I forgot to modify the subject (short vacations ...)
-- __________________________________
DESPRES Julien Ph.D. student
Center for Theoretical Physics Quantum Matter Theory team Ecole Polytechnique 91128 Palaiseau Cedex France, EU Office : 00.10.06 (ground floor) Phone : +33 1 69 33 42 81
Laboratoire Charles Fabry Atom Optics group Institut d'Optique Graduate School 2 Avenue Augustin Fresnel 91127 Palaiseau Cedex France, EU Office : R2.29 (1st floor) Phone: +33 1 64 53 33 49 __________________________________
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