Decay of Bogoliubov quasiparticles in a nonideal one-dimensional Bose gas - Archive ouverte HAL
Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2014

Decay of Bogoliubov quasiparticles in a nonideal one-dimensional Bose gas

Résumé

We study the relaxation of excitations in a system of one-dimensional weakly interacting bosons. Due to residual weak interactions, Bogoliubov quasiparticles in this system have finite lifetimes. As a result of the conservation laws in one dimension, at zero temperature the leading mechanism of decay of a quasiparticle is disintegration into three others. We focus on phonon quasiparticles and find that their decay rate is proportional to the seventh power of momentum. In the integrable case of contact interaction between the bosons, the decay rate vanishes.

Dates et versions

hal-01062754 , version 1 (10-09-2014)

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Zoran Ristivojevic, K. A. Matveev. Decay of Bogoliubov quasiparticles in a nonideal one-dimensional Bose gas. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2014, 89, pp.180507(R). ⟨10.1103/PhysRevB.89.180507⟩. ⟨hal-01062754⟩
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