Hi dear Alps users. I wonder is there any possibility to setup different hopping parameters for each site in the Hubbard chain and evaluate such a system using TEBD technic. Thank you for help.
Dear Nina,
The TEBD code in ALPS is not set up for site-dependent Hubbard parameters. Some of the other ALPS developers may be able to answer better whether such functionality will be added in near-term ALPS MPS codes. If not, Open Source MPS http://sourceforge.net/projects/openmps/ can perform the sorts of calculations you want to do, and eventually will become part of ALPS.
-Michael
On Fri, May 23, 2014 at 2:02 AM, bondnina bondnina@gmail.com wrote:
Dear Nina,
In the latest release of ALPS 2.2.0b3 we introduced a new set of codes based on MPS. These codes use the ALPS model and lattice library, therefore there is not no problem running this kind of simulations.
To do so: 1. you need to create a custom lattice with a different type for each bond. https://alps.comp-phys.org/mediawiki/index.php/Tutorials:LatticeHOWTO
2. the model “fermion Hubbard” is already able to handle different hopping amplitudes, just specify all values with the parameters t0=…, t1=…, … where the number correspond to the bond type you specified in the lattice
3. finally you can setup a simulation using the new mps_evolve code. the easiest is to look at the mps-05 and mps-06 tutorials to have an idea on how to run the code.
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 27 May 2014, at 18:30, Michael Wall mwall.physics@gmail.com wrote:
comp-phys-alps-users@lists.phys.ethz.ch