Beliaev Damping in Bose Gas

According to the Bogoliubov theory the low energy behaviour of the Bose gas at zero temperature can be described by non-interacting bosonic quasiparticles called phonons. In this work the damping rate of phonons at low momenta, the so-called Beliaev damping, is explained and computed with simple arg...

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Veröffentlicht in:	Journal of statistical physics 2024-08, Vol.191 (9), Article 110
Hauptverfasser:	Dereziński, Jan, Li, Ben, Napiórkowski, Marcin
Format:	Artikel
Sprache:	eng
Schlagworte:	Bogoliubov theory Damping Elementary excitations Mathematical and Computational Physics Phonons Physical Chemistry Physics Physics and Astronomy Quantum Physics Statistical Physics and Dynamical Systems Theoretical
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Zusammenfassung:	According to the Bogoliubov theory the low energy behaviour of the Bose gas at zero temperature can be described by non-interacting bosonic quasiparticles called phonons. In this work the damping rate of phonons at low momenta, the so-called Beliaev damping, is explained and computed with simple arguments involving the Fermi Golden Rule and Bogoliubov’s quasiparticles.
ISSN:	1572-9613 0022-4715 1572-9613
DOI:	10.1007/s10955-024-03328-2