Macroscopic spin tunneling and quantum critical behavior of a condensate in double-well potential

Details Macroscopic spin tunneling and quantum critical behavior of a condensate in double-well potential Macroscopic spin tunneling and quantum critical behavior of a condensate in double-well potential

2002-03-04

arxiv.org/abs/cond-mat/0203066v2

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.89.090401

In a previous work (PRL 87, 140405), we have shown that a spinor condensate confined in a periodic or double-well potential exhibits ferromagnetic behavior due to the magnetic dipole-dipole interactions between different wells, and in the absence of external magnetic field, the ground state has a two-fold degeneracy. In this work, we demonstrate the possibility of observing macroscopic quantum spin tunneling between these two degenerate states and show how the tunneling rate critically depends on the strength of the transverse field.

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