Quantum fluctuations in dipolar Bose gases

We investigate the influence of quantum fluctuations upon dipolar Bose gases by means of the Bogoliubov-de Gennes theory. Thereby, we make use of the local density approximation to evaluate the dipolar exchange interaction between the condensate and the excited particles. This allows to obtain the B...

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Bibliographic Details
Published in:Physical review. A, Atomic, molecular, and optical physics Atomic, molecular, and optical physics, 2011-10, Vol.84 (4), Article 041604
Main Authors: Lima, Aristeu R. P., Pelster, Axel
Format: Article
Language:English
Subjects:
APPROXIMATIONS
BOSE-EINSTEIN GAS
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
EQUATIONS OF MOTION
EXCHANGE INTERACTIONS
FLUCTUATIONS
GROUND STATES
HYDRODYNAMICS
OSCILLATIONS
QUANTUM MECHANICS
SPECTRA
TIME-OF-FLIGHT METHOD
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Summary:We investigate the influence of quantum fluctuations upon dipolar Bose gases by means of the Bogoliubov-de Gennes theory. Thereby, we make use of the local density approximation to evaluate the dipolar exchange interaction between the condensate and the excited particles. This allows to obtain the Bogoliubov spectrum analytically in the limit of large particle numbers. After discussing the condensate depletion and the ground-state energy correction, we derive quantum-corrected equations of motion for harmonically trapped dipolar Bose gases by using superfluid hydrodynamics. These equations are subsequently applied to analyze the equilibrium configuration, the low-lying oscillation frequencies, and the time-of-flight dynamics. We find that both atomic magnetic and molecular electric dipolar systems offer promising scenarios for detecting beyond mean-field effects.
ISSN:1050-2947
1094-1622
DOI:10.1103/PhysRevA.84.041604