Topological phase transitions driven by non-Abelian gauge potentials in optical square lattices
| Autor: | Luca Lepori, Emilio Alba, Michele Burrello, Andrea Trombettoni, Ion Cosma Fulga |
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| Přispěvatelé: | Burrello, M, Fulga, Ic, Alba, E, Lepori, L, Trombettoni, A |
| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: |
Quantum phase transition
Physics Phase transition Quantum Physics Statistical Mechanics (cond-mat.stat-mech) FOS: Physical sciences Quantum entanglement Fermion Topology Square lattice Conserved quantity Atomic and Molecular Physics and Optics Quantum Gases (cond-mat.quant-gas) Lattice (order) Topological order Quantum Physics (quant-ph) Condensed Matter - Quantum Gases Condensed Matter - Statistical Mechanics |
| Zdroj: | Physical review. A 88 (2013). doi:10.1103/PhysRevA.88.053619 info:cnr-pdr/source/autori:Burrello, M.; Fulga, I. C.; Alba, E.; Lepori, L.; Trombettoni, A./titolo:Topological phase transitions driven by non-Abelian gauge potentials in optical square lattices/doi:10.1103%2FPhysRevA.88.053619/rivista:Physical review. A/anno:2013/pagina_da:/pagina_a:/intervallo_pagine:/volume:88 Physical Review A, 88, 053619 Digital.CSIC. Repositorio Institucional del CSIC instname Physical Review A |
| ISSN: | 2009-1761 |
| DOI: | 10.1103/PhysRevA.88.053619 |
| Popis: | 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 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. This work was supported by the Dutch Science Foundation NWO/FOM and by an ERC Advanced Investigator Grant. A.T. acknowledges support from the STREP MatterWave. E.A. acknowledges funding from FPU 2009-1761. L.L. also acknowledges a grant from Banco de Santander and nancial support from ERDF. |
| Databáze: | OpenAIRE |
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