Quantum kinetic theory. III. Quantum kinetic master equation for strongly condensed trapped systems
| Autor: | Peter Zoller, Crispin W. Gardiner |
|---|---|
| Rok vydání: | 1998 |
| Předmět: |
Condensed Matter::Quantum Gases
Physics Statistical Mechanics (cond-mat.stat-mech) Condensed Matter::Other Thermodynamic equilibrium Quantum superposition FOS: Physical sciences Atomic and Molecular Physics and Optics Quantum mechanics Master equation Kinetic theory of gases Quasiparticle Quantum statistical mechanics Quantum Condensed Matter - Statistical Mechanics Stationary state |
| Zdroj: | Physical Review A. 58:536-556 |
| ISSN: | 1094-1622 1050-2947 |
| DOI: | 10.1103/physreva.58.536 |
| Popis: | We extend quantum kinetic theory to deal with a strongly Bose-condensed atomic vapor in a trap. The method assumes that the majority of the vapor is not condensed, and acts as a bath of heat and atoms for the condensate. The condensate is described by the particle number conserving Bogoliubov method developed by one of the authors. We derive equations which describe the fluctuations of particle number and phase, and the growth of the Bose-Einstein condensate. The equilibrium state of the condensate is a mixture of states with different numbers of particles and quasiparticles. It is not a quantum superposition of states with different numbers of particles---nevertheless, the stationary state exhibits the property of off-diagonal long range order, to the extent that this concept makes sense in a tightly trapped condensate. 3 figures submitted to Physical Review A |
| Databáze: | OpenAIRE |
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