Inflationary quasiparticle creation and thermalization dynamics in coupled Bose-Einstein condensates
| Autor: | Mauricio Trujillo-Martinez, Anna Posazhennikova, Johann Kroha |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Cosmology and Nongalactic Astrophysics (astro-ph.CO)
Bose gas General Physics and Astronomy FOS: Physical sciences 02 engineering and technology 01 natural sciences law.invention law Quantum mechanics 0103 physical sciences 010306 general physics Condensed Matter - Statistical Mechanics Physics Condensed Matter::Quantum Gases Quantum Physics Statistical Mechanics (cond-mat.stat-mech) Condensed Matter::Other Decoupling (cosmology) 021001 nanoscience & nanotechnology Thermalisation Quantum Gases (cond-mat.quant-gas) Quantum electrodynamics Quasiparticle Relaxation (physics) Parametric oscillator 0210 nano-technology Ground state Quantum Physics (quant-ph) Condensed Matter - Quantum Gases Bose–Einstein condensate Astrophysics - Cosmology and Nongalactic Astrophysics |
| Popis: | A Bose gas in a double-well potential, exhibiting a true Bose-Einstein condensate (BEC) amplitude and initially performing Josephson oscillations, is a prototype of an isolated, non-equilibrium many-body system. We investigate the quasiparticle (QP) creation and thermalization dynamics of this system by solving the time-dependent Keldysh-Bogoliubov equations. We find avalanche-like QP creation due to a parametric resonance between BEC and QP oscillations, followed by slow, exponential relaxation to a thermal state at an elevated temperature, controlled by the initial excitation energy of the oscillating BEC above its ground state. The crossover between the two regimes occurs because of an effective decoupling of the QP and BEC oscillations. This dynamics is analogous to elementary particle creation in models of the early universe. The thermalization in our set-up occurs because the BEC acts as a grand canonical reservoir for the quasiparticle system. 5 pages, 4 Figures, final version accepted for publication in Phys. Rev. Lett |
| Databáze: | OpenAIRE |
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