Absence of damping of low energy excitations in a quasi-2D dipolar Bose gas

Abstract

We develop a theory of damping of low energy, collective excitations in a quasi-2D, homogenous, dipolar Bose gas at zero temperature, via processes whereby an excitation decays into two excitations with lower energy. We find that owing to the nature of the low energy spectrum of a quasi-2D dipolar gas, such processes cannot occur unless the momentum of the incoming quasi-particle exceeds a critical value k_{crit}. We find that as the dipolar interaction strength is increased, this critical value shifts to larger momenta. Our predictions can be directly verified in current experiments on dipolar Bose condensates using Bragg spectroscopy, and provide valuable insight into the quantum many-body physics of dipolar gases.

4 pages, 2 figures

References in corpus (6)

• Bose-Einstein Condensation of Erbium
• Quantum degenerate dipolar Fermi gas
• Stabilizing a purely dipolar quantum gas against collapse
• d-wave collapse and explosion of a dipolar Bose-Einstein condensate
• Spontaneous Magnon Decays
• Stability of quasi-two-dimensional Bose-Einstein condensates with dominant dipole-dipole interactions

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• Dynamics of correlations in a quasi-2D dipolar Bose gas following a quantum quench
• Higher-order effective interactions for bosons near a two-body zero crossing
• Beliaev Damping in Spin-$\frac{1}{2}$ Interacting Bosons with Spin-Orbit Coupling
• Damping of long wavelength collective modes in spinor Bose-Fermi mixtures
• Phonon decay in 1D atomic Bose quasicondensates via Beliaev-Landau damping
• Landau Damping in a Mixture of Bose and Fermi Superfluids
• Beliaev damping in quasi-2D dipolar condensates
• Electronic properties and polaronic dynamics of semi-Dirac system within ladder approximation
• 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