Quantum Hall effect in momentum space

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.

12 pages, 5 figures

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Cited by in corpus (5)

• Topological Photonics
• Topological quantum matter in synthetic dimensions
• Topological fractional pumping with alkaline-earth(-like) ultracold atoms
• Band geometry from position-momentum duality at topological band crossings
• Berry-electrodynamics - Anomalous drift and pumping from time-dependent Berry connection