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

Preprint

9 April 2002

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.cond-mat/0203066

Abstract

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.

Keywords

QUANTUM CRITICAL
MACROSCOPIC SPIN
SPIN TUNNELING
WELL POTENTIAL
FERROMAGNETIC
DOUBLE WELL
CONDENSATE
TUNNELING
BEHAVIOR

All Related Versions

Version 1, 2002-03-04, ArXiv
Version 2, 2002-04-09, ArXiv
Published version: Physical Review Letters, 89 (9), 090401.

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