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Título

Topological phase transitions driven by non-Abelian gauge potentials in optical square lattices

Autor Burrello, M.; Fulga, I.C.; Alba, Emilio ; Lepori, L.; Trombettoni, A
Fecha de publicación 2013
EditorAmerican Physical Society
Citación Physical review A 88 : 053619 (2013)
ResumenWe analyze a tight-binding model of ultracold fermions loaded in an optical square lattice and subjected to a synthetic non-Abelian gauge potential featuring both a magnetic field and a translationally invariant SU(2) term. We consider in particular the effect of broken time-reversal symmetry and its role in driving nontrivial topological phase transitions. By varying the spin-orbit coupling parameters, we find both a semimetal-insulator phase transition and a topological phase transition between insulating phases with different numbers of edge states. The spin is not a conserved quantity of the system, and the topological phase transitions can be detected by analyzing its polarization in time-of-flight images, providing a clear diagnostic for the characterization of the topological phases through the partial entanglement between spin and lattice degrees of freedom. © 2013 American Physical Society.
URI http://hdl.handle.net/10261/89591
DOI10.1103/PhysRevA.88.053619
Identificadoresdoi: 10.1103/PhysRevA.88.053619
issn: 1050-2947
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