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      Visualizing edge states with an atomic Bose gas in the quantum Hall regime

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          Abstract

          We engineered a two-dimensional magnetic lattice in an elongated strip geometry, with effective per-plaquette flux ~4/3 times the flux quanta. We imaged the localized edge and bulk states of atomic Bose-Einstein condensates in this strip, with single lattice-site resolution along the narrow direction. Further, we observed both the skipping orbits of excited atoms traveling down our system's edges, analogues to edge magnetoplasmons in 2-D electron systems, and a dynamical Hall effect for bulk excitations. Our lattice's long direction consisted of the sites of an optical lattice and its narrow direction consisted of the internal atomic spin states. Our technique has minimal heating, a feature that will be important for spectroscopic measurements of the Hofstadter butterfly and realizations of Laughlin's charge pump.

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          Journal
          09 February 2015
          Article
          10.1126/science.aaa8515
          26404830
          1502.02496
          e6315efd-23d6-4403-a7d8-9900f9cb3ed1

          http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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          Science 349, 1514-1518 (2015)
          14 pages, 4 figures
          cond-mat.quant-gas physics.atom-ph quant-ph

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