Exact density matrix of an oscillator-bath system: Alternative derivation

被引：1
|
作者：
Kheirandish, Fardin [1 ]
机构：
[1] Univ Kurdistan, Dept Phys, Fac Sci, POB 66177-15175, Sanandaj, Iran
来源：
PHYSICS LETTERS A | 2018年 / 382卷 / 46期
关键词：
Density matrix; Oscillator-bath; Propagator; Generating function; QUANTUM BROWNIAN-MOTION; ENVIRONMENT; EQUATION; MODEL;
D O I：
10.1016/j.physleta.2018.09.030
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Starting from a total Lagrangian describing an oscillator-bath system, an alternative derivation of exact quantum propagator is presented. Having the quantum propagator, the exact density matrix, reduced density matrix of the main oscillator and thermal equilibrium fixed point are obtained. The modified quantum propagator is obtained in the generalised case where the main oscillator is under the influence of a classical external force. By introducing auxiliary classical external fields, the generalised quantum propagator or generating functional of position correlation functions is obtained. (C) 2018 Elsevier B.V. All rights reserved.
引用
收藏
页码：3339 / 3346
页数：8
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