Two-dimensional Bose gas under extreme rotation

Details Two-dimensional Bose gas under extreme rotation Two-dimensional Bose gas under extreme rotation

2004-12-06

arxiv.org/abs/cond-mat/0412139v2

Physics

Condensed Matter

Statistical Mechanics

typos corrected, ref. added, minor changes in the paper

Scientific paper

10.1103/PhysRevLett.94.150401

We show that a Bose-condensed gas under extreme rotation in a 2D anisotropic trap, forms a novel elongated quantum fluid which has a roton-maxon excitation spectrum. For a sufficiently large interaction strength, the roton energy reaches zero and the system undergoes a second order quantum transition to the state with a periodic structure - rows of vortices. The number of rows increases with the interaction, and the vortices eventually form a triangular Abrikosov lattice.

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