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Topological phase transitions driven by non-Abelian gauge potentials in optical square lattices | | M. Burrello
; I.C. Fulga
; E. Alba
; L. Lepori
; A. Trombettoni
; | | Date: |
3 Aug 2013 | | Abstract: | We 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 translational invariant SU(2) term. We
consider in particular the effect of broken time-reversal symmetry and its role
in driving non-trivial 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 a different number
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 diagnostics for the characterization
of the topological phases through the partial entanglement between spin and
lattice degrees of freedom. | | Source: | arXiv, 1308.0750 | | Services: | Forum | Review | PDF | Favorites | |
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