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arXiv · 1508.04480

Geometrical pumping with a Bose-Einstein condensate

Hsin-I Lu·Max Schemmer·Lauren M. Aycock·Dina Genkina·Seiji Sugawa·Ian B. Spielman
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Abstract

We realized a quantum geometric "charge" pump for a Bose-Einstein condensate (BEC) in the lowest Bloch band of a novel bipartite magnetic lattice. Topological charge pumps in filled bands yield quantized pumping set by the global -- topological -- properties of the bands. In contrast, our geometric charge pump for a BEC occupying just a single crystal momentum state exhibits non-quantized charge pumping set by local -- geometrical -- properties of the band structure. Like topological charge pumps, for each pump cycle we observed an overall displacement (here, not quantized) and a temporal modulation of the atomic wavepacket's position in each unit cell, i.e., the polarization.

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Hsin-I Lu, Max Schemmer, Lauren M. Aycock, Dina Genkina, Seiji Sugawa, Ian B. Spielman. 2016-04-29. Geometrical pumping with a Bose-Einstein condensate. https://doi.org/10.1103/physrevlett.116.200402

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