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激光驱动下腔与玻色-爱因斯坦凝聚中的量子相变
  • ISSN号：1000-3290
  • 期刊名称：《物理学报》
  • 时间：0
  • 分类：O469[理学—凝聚态物理;理学—电子物理学;理学—物理]
  • 作者机构：[1]山西大学物理电子工程学院理论物理研究所,太原030006
  • 相关基金：国家自然科学基金（批准号：11075099,11047167,11105087）资助的课题.
作者： 刘妮[1]
关键词： DICKE模型, 量子相变, Holstein.Primafoff变换, Dicke model, quantum phase transition, Holstein-Primafoff transformation
中文摘要：

Dicke模型中的量子相变在三十多年前已被预言，该模型描述的是N个二能级原子与单模腔场集体耦合的系统．在标准Dicke模型的基础上加入原子光的非线性相互作用和含时外场驱动，使用含时幺正变换和Holstein-Primafoff变换方法从理论上推导出基态能量表达式．并且给出了丰富的相图，而且这些性质最近已有文献从实验上验证．本文主要呈现了非线性相互作用和外场驱动对量子相变的影响．

英文摘要：

When an atomic ensemble is coupled with a cavity field governed by the well-known Dicke model, an important quantum phase transition （QPT） from the normal phase to the superradiant phase occurs, which was predicted more than 30 years ago. In this paper, both the atom-photon nonlinear interaction and the driving field are added to the Dicke＇s Hamiltonian. With the method of Holstein- Primafoff transformation, the ground state energy is given by the theoretical calculation, and the rich phase figures are presented. Meanwhile, these properties are observed experimentally. We mainly dicuss the effects of the atom-photon nonlinear interaction and the driving field on QPT.

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期刊信息
  • 《物理学报》
  • 北大核心期刊（2011版）
  • 主管单位:中国科学院
  • 主办单位:中国物理学会 中国科学院物理研究所
  • 主编：欧阳钟灿
  • 地址：北京603信箱(中国科学院物理研究所)
  • 邮编：100190
  • 邮箱：apsoffice@iphy.ac.cn
  • 电话：010-82649026
  • 国际标准刊号：ISSN：1000-3290
  • 国内统一刊号：ISSN：11-1958/O4
  • 邮发代号:2-425
  • 获奖情况:
  • 1999年首届国家期刊奖,2000年中科院优秀期刊特等奖,2001年科技期刊最高方阵队双高期刊居中国期刊第12位
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  • 被引量:49876