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Article overview
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Chern numbers hiding in time-of-flight images | Erhai Zhao
; Noah Bray-Ali
; Carl J. Williams
; I. B. Spielman
; Indubala I. Satija
; | Date: |
16 May 2011 | Abstract: | We present a novel technique for detecting topological invariants -- Chern
numbers -- from time-of-flight images of ultra-cold neutral atoms. The Chern
number of fermions in a lattice potential depends on magnetic field (for
neutral atoms, generated by an artificial magnetic field) and the chemical
potential; we find that the Chern numbers leave their fingerprints as
oscillations in the atoms’ momentum distribution. The signature is strikingly
enhanced for anisotropic hopping, where we show the momentum distribution
assumes a sinusoidal form with period determined by the Chern number. | Source: | arXiv, 1105.3100 | Services: | Forum | Review | PDF | Favorites |
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