Landau damping in a collisionless dipolar Bose gas

Abstract

We present a theory for the Landau damping of low energy quasi-particles in a collisionless, quasi-2D dipolar Bose gas and produce expressions for the damping rate in uniform and non-uniform systems. Using simple energy-momentum conservation arguments, we show that in the homogeneous system, the nature of the low energy dispersion in a dipolar Bose gas severely inhibits Landau damping of long wave-length excitations. For a gas with contact and dipolar interactions, the damping rate for phonons tends to decrease with increasing dipolar interactions; for strong dipole-dipole interactions, phonons are virtually undamped over a broad range of temperature. The damping rate for maxon-roton excitations is found to be significantly larger than the damping rate for phonons.

11 pages, 4 figures

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• Beliaev Damping in Spin-$\frac{1}{2}$ Interacting Bosons with Spin-Orbit Coupling
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• A Universal Self-Amplification Channel for Surface Plasma Waves
• Possible self-amplification channel for surface plasma waves
• Quantum Landau damping in dipolar Bose-Einstein condensates
• Stoner-Wohlfarth switching of the condensate magnetization in a dipolar spinor gas and the metrology of excitation damping
• Beliaev damping in quasi-2D dipolar condensates
• Damping of elementary excitations in one-dimensional dipolar Bose gases
• Damping of Confined Excitations Modes of 1D Condensates in an Optical Lattice
• Rotons and their damping in elongated dipolar Bose-Einstein condensates
• Absence of Landau damping in driven three-component Bose-Einstein condensate in optical lattices
• Damping-free collective oscillations of a driven two-component Bose gas in optical lattices
• Collective modes of trapped spinor Bose condensates