Spontaneous rotation in one-dimensional systems of cold atoms

Details Spontaneous rotation in one-dimensional systems of cold atoms Spontaneous rotation in one-dimensional systems of cold atoms

2007-12-04

arxiv.org/abs/0712.0431v2

Phys. Rev. A 78, 013623 (2008)

Physics

Condensed Matter

Other Condensed Matter

6 pages, 3 figures, final version

Scientific paper

10.1103/PhysRevA.78.013623

We theoretically study harmonically trapped one-dimensional Bose gases (e.g., Li, Na, K, Rb, etc.) with multibands occupied, focusing on effects of higher-energy bands. Combining the Ginzburg-Landau theory with the bosonization techniques, we predict that the repulsive interaction between higher-band bosons and the quantum fluctuation can induce the ground state with a finite angular momentum around the trapped axis. In this state, the Z_2 reflection symmetry (clockwise or anticlockwise rotations) is spontaneously broken.

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