Sum rules, dipole oscillation and spin polarizability of a spin-orbit coupled quantum gas

Year: 2012

Authors: Li Y., Martone G.I., Stringari S.

Autors Affiliation: Univ Trent, Dipartimento Fis, I-38123 Povo, Italy; INO CNR BEC Ctr, I-38123 Povo, Italy.

Abstract: Using a sum rule approach we investigate the dipole oscillation of a spin-orbit coupled Bose-Einstein condensate confined in a harmonic trap. The crucial role played by the spin polarizability of the gas is pointed out. We show that the lowest dipole frequency exhibits a characteristic jump at the transition between the stripe and spin-polarized phase. Near the second-order transition between the spin-polarized and the single minimum phase the lowest frequency is vanishingly small for large condensates, reflecting the divergent behavior of the spin polarizability. We compare our results with recent experimental measurements as well as with the predictions of effective mass approximation.

Journal/Review: EUROPHYSICS LETTERS

Volume: 99 (5)      Pages from: 56008-1  to: 56008-5

More Information: Stimulating discussions with LEV PITAEVSKII, HUI ZHAI and SHUAI CHEN are acknowledged. This work has been supported by ERC through the QGBE grant.
KeyWords: Neutral Atoms; Quantum phase transitions; Dynamic properties of condensates
DOI: 10.1209/0295-5075/99/56008

Citations: 61
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