Interface dynamics of a two-component Bose-Einstein condensate driven by an external force
- Department of Physics, Umeaa University, S-901 87 Umeaa (Sweden)
- Department of Mechanical and Aerospace Engineering, Princeton University, Princeton New Jersey, 08544-5263 (United States)
The dynamics of an interface in a two-component Bose-Einstein condensate driven by a spatially uniform time-dependent force is studied. Starting from the Gross-Pitaevskii Lagrangian, the dispersion relation for linear waves and instabilities at the interface is derived by means of a variational approach. A number of diverse dynamical effects for different types of driving force is demonstrated, which includes the Rayleigh-Taylor instability for a constant force, the Richtmyer-Meshkov instability for a pulse force, dynamic stabilization of the Rayleigh-Taylor instability and onset of the parametric instability for an oscillating force. Gaussian Markovian and non-Markovian stochastic forces are also considered. It is found that the Markovian stochastic force does not produce any average effect on the dynamics of the interface, while the non-Markovian force leads to exponential perturbation growth.
- OSTI ID:
- 21544684
- Journal Information:
- Physical Review. A, Vol. 83, Issue 4; Other Information: DOI: 10.1103/PhysRevA.83.043623; (c) 2011 American Institute of Physics; ISSN 1050-2947
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
GENERAL PHYSICS
74 ATOMIC AND MOLECULAR PHYSICS
BOSE-EINSTEIN CONDENSATION
DISPERSION RELATIONS
DISTURBANCES
INTERFACES
LAGRANGIAN FUNCTION
MARKOV PROCESS
PARAMETRIC INSTABILITIES
PULSES
RAYLEIGH-TAYLOR INSTABILITY
STABILIZATION
TIME DEPENDENCE
VARIATIONAL METHODS
CALCULATION METHODS
FUNCTIONS
INSTABILITY
PLASMA INSTABILITY
PLASMA MACROINSTABILITIES
STOCHASTIC PROCESSES