Dear Michele, it is very helpful and I FINALLY got some nice results. [?] good day!
2015-06-01 21:33 GMT+02:00 Michele Dolfi dolfim@phys.ethz.ch:
Dear Cathy,
I’m not sure I fully get what if your goal. Here is anyway what I would do.
Usually for inhomogeneous models we define lattice sites with different type and set different values of the model parameters for each type.
Quick example: In mylattice.xml you define the graph
<LATTICES> <GRAPH name="my great lattice" dimension="1" vertices=“3" edges="2"> <VERTEX id="1" type="0"><COORDINATE>0</COORDINATE></VERTEX> <VERTEX id="2" type="1"><COORDINATE>1</COORDINATE></VERTEX> <VERTEX id="3" type=“2"><COORDINATE>2</COORDINATE></VERTEX> <EDGE source="1" target="2" id="1" type="0" vector="1"/> <EDGE source="2" target="3" id="2" type="0" vector="1"/> </GRAPH> </LATTICES>
In the parameter file: LATTICE_LIBRARY="mylattice.xml" LATTICE="my great lattice" MODEL=“fermion Hubbard” t=1 U=8 mu0=0 mu1=10 mu2=5
This will have a different chemical potential for each of the three sites.
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
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On 01 Jun 2015, at 18:31, Cathy Wu cathy.em2013@gmail.com wrote:
Dear everyone, Does anyone know how to use the "coordinate " parameter in the models.xml file. I am trying to defining a quasi-periodic potential. But the "sparsediag" function does not recognize site "i". best regards!
