Quantum Hall effect in momentum space

Research output: Contribution to journalArticlepeer-review

Authors

Colleges, School and Institutes

External organisations

  • CNR-INFM BEC Center

Abstract

We theoretically discuss a momentum-space analog of the quantum Hall effect, which could be observed in topologically nontrivial lattice models subject to an external harmonic trapping potential. In our proposal, the Niu-Thouless-Wu formulation of the quantum Hall effect on a torus is realized in the toroidally shaped Brillouin zone. In this analogy, the position of the trap center in real space controls the magnetic fluxes that are inserted through the holes of the torus in momentum space. We illustrate the momentum-space quantum Hall effect with the noninteracting trapped Harper-Hofstadter model, for which we numerically demonstrate how this effect manifests itself in experimental observables. Extension to the interacting trapped Harper-Hofstadter model is also briefly considered. We finally discuss possible experimental platforms where our proposal for the momentum-space quantum Hall effect could be realized.

Details

Original languageEnglish
Article number195201
JournalPhysical Review B
Volume93
Issue number19
Publication statusPublished - 4 May 2016

ASJC Scopus subject areas