Geometrical pumping with a Bose-Einstein condensate
Quantum Gases
2016-05-25 v2
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.
Keywords
Cite
@article{arxiv.1508.04480,
title = {Geometrical pumping with a Bose-Einstein condensate},
author = {Hsin-I Lu and Max Schemmer and Lauren M. Aycock and Dina Genkina and Seiji Sugawa and Ian B. Spielman},
journal= {arXiv preprint arXiv:1508.04480},
year = {2016}
}
Comments
5 pages, 4 figures for the main text + supplementary material