دورية أكاديمية
Quantum dynamics of a harmonic oscillator in a non-equilibrium bath without the rotating wave approximation
| العنوان: | Quantum dynamics of a harmonic oscillator in a non-equilibrium bath without the rotating wave approximation |
|---|---|
| المؤلفون: | Mohsen Daeimohammad |
| المصدر: | Iranian Journal of Physics Research, Vol 22, Iss 1, Pp 195-211 (2022) |
| بيانات النشر: | Isfahan University of Technology, 2022. |
| سنة النشر: | 2022 |
| المجموعة: | LCC:Physics |
| مصطلحات موضوعية: | the rotating wave approximation, counter-rotating terms, virtual-photon, wigner-weisskopf approximation, langevin equation, diffusion coefficient, Physics, QC1-999 |
| الوصف: | The aim of this paper is to investigate dynamical properties of a harmonic oscillator coupled to a non-equilibrium bath without the rotating wave approximation. At first, we investigate the theory of this model and obtain the Heisenberg equations of motion for the oscillator and bath annihilation operators in the absence and in the presence of a rotating wave approximation. Then, we obtain the fluctuation and fluctuation-dissipation relations in the absence and in the presence of a rotating wave approximation for the non-equilibrium bath annihilation operator, respectively. After that, we study the decay of system modes using the Wigner-Weisskopf approximation. Finally, we calculate the time-dependent spectrum of a cavity field mode coupled to a non-equilibrium reservoir. We show that even under the condition in which the RWA is considered to be valid (weak interaction), there are significant effects of virtual-photon field on the diffusion coefficient, the energy density, line width and the shift frequency. |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English Persian |
| تدمد: | 1682-6957 2345-3664 |
| Relation: | https://ijpr.iut.ac.ir/article_1777_70384b3f2e6061f7a18636d03c2aca43.pdf; https://doaj.org/toc/1682-6957; https://doaj.org/toc/2345-3664 |
| DOI: | 10.47176/ijpr.22.1.81300 |
| URL الوصول: | https://doaj.org/article/f7ca70ae74f84feeb626fa813440b4b5 |
| رقم الأكسشن: | edsdoj.f7ca70ae74f84feeb626fa813440b4b5 |
| قاعدة البيانات: | Directory of Open Access Journals |
Full Text Finder | تدمد: | 16826957 23453664 |
|---|---|
| DOI: | 10.47176/ijpr.22.1.81300 |