Nonequilibrium free energy and information flow of a double quantum-dot system with Coulomb coupling  

作　　者：Zhiyuan Lin Tong Fu Juying Xiao Shanhe Su Jincan Chen Yanchao Zhang 林智远;付彤;肖菊英;苏山河;陈金灿;张艳超(Department of Physics,Xiamen University,Xiamen 361005,China;School of Science,Guangxi University of Science and Technology,Liuzhou 545006,China)

机构地区：[1]Department of Physics,Xiamen University,Xiamen 361005,China [2]School of Science,Guangxi University of Science and Technology,Liuzhou 545006,China

出　　处：《Chinese Physics B》2021年第8期231-239,共9页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation(Grant No.11805159);the First Batch of National First-class Undergraduate Courses of China(2020);the Natural Science Foundation of Fujian Province,China(Grant No.2019J05003);Teaching Research Program of Thermodynamics and Statistical Physics in the Institution of Higher Education of China(2019).

摘　　要：We build a double quantum-dot system with Coulomb coupling and aim at studying connections among the entropy production,free energy,and information flow.By utilizing concepts in stochastic thermodynamics and graph theory analysis,Clausius and nonequilibrium free energy inequalities are built to interpret local second law of thermodynamics for subsystems.A fundamental set of cycle fluxes and affinities is identified to decompose two inequalities by using Schnakenberg's network theory.Results show that the thermodynamic irreversibility has energy-related and information-related contributions.A global cycle associated with the feedback-induced information flow would pump electrons against the bias voltage,which implements a Maxwell demon.

关 键 词：quantum dot nonequilibrium free energy information graph theory analysis 

分 类 号：O471.1[理学—半导体物理]