All Questions
3
questions
3
votes
1
answer
336
views
Conserved charge in Density Matrix Renormalization Group (DMRG)
Currently I am facing a problem which relates to the conserved quantities in DMRG. I use old-fashioned DMRG (Steven White approach) to compute the ground state of certain models. However, the ground ...
0
votes
0
answers
120
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Quantum Monte Carlo Loop Algorithm for quantum spin: why is the freezing graph present in ferromagnetic Ising model?
I study the loop algorithm (Evertz et al).
I cannot understand, why the freezing graph type where we have to flip all 4 spins together is not present for the quantum-XY model and the anti-/...
0
votes
0
answers
57
views
Antiferromagnetic-like interaction, but preferring 120/240 angles instead of 180?
Antiferromagnetic interaction energetically prefers opposite spins for neighbors: rotated by 180 degrees.
But imagine there is $S_3$ symmetry: 3 possibilities rotated by 120 degrees and ...