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Title: Quantum phase transitions for two coupled cavities with dipole-interaction atoms

Abstract

We investigate the quantum phase transitions for two weakly coupled atom-cavity sites. The interatomic dipole-dipole interaction is considered. Our numerical results show that the dipole-dipole interaction is a crucial parameter for the quantum phase transition. For small atom-cavity detuning, the ''superfluid'' becomes more and more obvious with the increase of the dipole-dipole interaction. In addition, the strong dipole-dipole interaction can lead the atomic excitation to be suppressed completely, and only the photonic excitation exists for the ground states. When the atom-cavity detuning is comparable with the dipole-dipole interaction, the dipole-dipole interaction enlarges the positive detunings, which is in favor of exhibiting superfluid photonic states. While for the negative detuning, the dipole-dipole interaction will reduce it, and contribute to the formation of the polaritonic insulator states. The cases for extended models have also been briefly analyzed. We also discuss how to find these novel phenomena in future experiments.

Authors:
 [1];  [1];  [2]
  1. Institute of Theoretical Physics, Lanzhou University, Lanzhou 730000 (China)
  2. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190 (China)
Publication Date:
OSTI Identifier:
22095706
Resource Type:
Journal Article
Journal Name:
Physical Review. A
Additional Journal Information:
Journal Volume: 84; Journal Issue: 6; Other Information: (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1050-2947
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 74 ATOMIC AND MOLECULAR PHYSICS; ATOMS; CAVITY RESONATORS; DIPOLES; EXCITATION; GROUND STATES; PHASE TRANSFORMATIONS; QUANTUM MECHANICS; SUPERFLUIDITY

Citation Formats

Lei, Tan, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, Yuqing, Zhang, and Wuming, Liu. Quantum phase transitions for two coupled cavities with dipole-interaction atoms. United States: N. p., 2011. Web. doi:10.1103/PHYSREVA.84.063816.
Lei, Tan, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, Yuqing, Zhang, & Wuming, Liu. Quantum phase transitions for two coupled cavities with dipole-interaction atoms. United States. https://doi.org/10.1103/PHYSREVA.84.063816
Lei, Tan, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, Yuqing, Zhang, and Wuming, Liu. 2011. "Quantum phase transitions for two coupled cavities with dipole-interaction atoms". United States. https://doi.org/10.1103/PHYSREVA.84.063816.
@article{osti_22095706,
title = {Quantum phase transitions for two coupled cavities with dipole-interaction atoms},
author = {Lei, Tan and Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190 and Yuqing, Zhang and Wuming, Liu},
abstractNote = {We investigate the quantum phase transitions for two weakly coupled atom-cavity sites. The interatomic dipole-dipole interaction is considered. Our numerical results show that the dipole-dipole interaction is a crucial parameter for the quantum phase transition. For small atom-cavity detuning, the ''superfluid'' becomes more and more obvious with the increase of the dipole-dipole interaction. In addition, the strong dipole-dipole interaction can lead the atomic excitation to be suppressed completely, and only the photonic excitation exists for the ground states. When the atom-cavity detuning is comparable with the dipole-dipole interaction, the dipole-dipole interaction enlarges the positive detunings, which is in favor of exhibiting superfluid photonic states. While for the negative detuning, the dipole-dipole interaction will reduce it, and contribute to the formation of the polaritonic insulator states. The cases for extended models have also been briefly analyzed. We also discuss how to find these novel phenomena in future experiments.},
doi = {10.1103/PHYSREVA.84.063816},
url = {https://www.osti.gov/biblio/22095706}, journal = {Physical Review. A},
issn = {1050-2947},
number = 6,
volume = 84,
place = {United States},
year = {Thu Dec 15 00:00:00 EST 2011},
month = {Thu Dec 15 00:00:00 EST 2011}
}