Momentum-space Harper-Hofstadter model
Anno: 2015
Autori: Ozawa T., Price HM., Carusotto I.
Affiliazione autori: Univ Trento, INO CNR BEC Ctr, I-38123 Povo, Italy; Univ Trento, Dipartimento Fis, I-38123 Povo, Italy
Abstract: We show how the weakly trapped Harper-Hofstadter model can be mapped onto a Harper-Hofstadter model in momentum space. In this momentum-space model, the band dispersion plays the role of the periodic potential, the Berry curvature plays the role of an effective magnetic field, the real-space harmonic trap provides the momentum-space kinetic energy responsible for the hopping, and the trap position sets the boundary conditions around the magnetic Brillouin zone. Spatially local interactions translate into nonlocal interactions in momentum space: within a mean-field approximation, we show that increasing interparticle interactions leads to a structural change of the ground state, from a single rotationally symmetric ground state to degenerate ground states that spontaneously break rotational symmetry.
Giornale/Rivista: PHYSICAL REVIEW A
Volume: 92 (2) Da Pagina: 023609-1 A: 023609-10
Parole chiavi: TOPOLOGICAL INSULATORS; HALL CONDUCTANCE; MAGNETIC-FIELD; GAUGE-FIELDS; PHASE; LATTICE; STATES; SUPERLATTICES; ELECTRONS; BANDSDOI: 10.1103/PhysRevA.92.023609Citazioni: 11dati da “WEB OF SCIENCE” (of Thomson Reuters) aggiornati al: 2024-03-24Riferimenti tratti da Isi Web of Knowledge: (solo abbonati) Link per visualizzare la scheda su IsiWeb: Clicca quiLink per visualizzare la citazioni su IsiWeb: Clicca qui