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Intrinsic self-rotation of BEC Bloch wave packets

Roberto B. Diener·Artem M. Dudarev·Ganesh Sundaram·Qian Niu
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Abstract

The semiclassical theory of Bloch wave packet dynamics predicts a self-rotation angular momentum in asymmetric periodic potentials, which has never been observed. We show how this is manifested in Bose-Einstein condensed atoms in optical lattices. Displacing the wave packet to a corner of the Brillouin zone we obtain a current distribution with a non-quantized angular momentum, independent of the size of the distribution. A weak interatomic interaction does not modify the results, affecting only the rate of spreading in the lattice. A strong repulsive interaction results in a collapse of the wavefunction into matter-wave lattice solitons.

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Roberto B. Diener, Artem M. Dudarev, Ganesh Sundaram, Qian Niu. 2003-06-06. Intrinsic self-rotation of BEC Bloch wave packets. https://arxiv.org/abs/cond-mat/0306184

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