| Quantum Tricritical Point in the Spin-Boson Model with an Ohmic Bath |
| |
| 引用本文： | 陈文 陈芝得. Quantum Tricritical Point in the Spin-Boson Model with an Ohmic Bath[J]. 中国物理快报, 2007, 24(5): 1140-1143 |
| |
| 作者姓名： | 陈文 陈芝得 |
| |
| 作者单位： | Department of Physics, Jinan University, Guangzhou 510632 |
| |
| 基金项目： | Supported by the National Natural Science Foundation of China under Grant No 10575045. |
| |
| 摘 要： | ![]()
The dynamics of the spin-boson model with an Ohmic bath at finite temperature is studied by a variational calculation. Numerical solution of the self-consistent equation derived from the variational method shows that the transition from incoherent to coherent phases is discontinuous. It indicates that （T = 0, s = 1） is a tricritical point, i.e. the transition changes from continuous to discontinuous by tuning from T = 0 to T≠ 0. The discontinuous transition at finite temperature is analysed by Landau theory and the relation to the experimental observation on the coherent state is also discussed.
|
| 关 键 词： | 自旋玻色子模型 量子 温度 自调和方程 |
| 收稿时间： | 2006-10-18 |
| 修稿时间： | 2006-10-18 |
Quantum Tricritical Point in the Spin-Boson Model with an Ohmic Bath |
| |
| CHEN Wen,CHEN Zhi-De. Quantum Tricritical Point in the Spin-Boson Model with an Ohmic Bath[J]. Chinese Physics Letters, 2007, 24(5): 1140-1143 |
| |
| Authors: | CHEN Wen CHEN Zhi-De |
| |
| Affiliation: | Department of Physics, Jinan University, Guangzhou 510632 |
| |
| Abstract: | ![]()
|
| |
| Keywords: | 03.65.Yz 03.65.Xp 73.40.Gk |
| 本文献已被 维普 等数据库收录！ |
| 点击此处可从《中国物理快报》浏览原始摘要信息 |
|
点击此处可从《中国物理快报》下载免费的PDF全文 |
