半导体量子点中的线性热电效应:电子自旋的作用  

Linear thermoelectric effect in semiconductor quantum dot: influence of the electron spin

作　　者：李九达[1] 刘小嵩[1] 迟锋[2] 

机构地区：[1]渤海大学数理学院,辽宁锦州121013 [2]渤海大学工学院,辽宁锦州121013

出　　处：《渤海大学学报（自然科学版）》2013年第1期25-29,共5页Journal of Bohai University:Natural Science Edition

基　　金：国家自然科学基金资助项目(No:61274101)

摘　　要：研究半导体量子点中温度差和电压趋近于零条件下的线性热电效应,用非平衡格林函数方法计算了系统的电导率、热导率、塞贝克常数和品质因子.发现在量子点与铁磁引线耦合的器件中,流过系统的电子将变得自旋极化,从而对以上物理量产生非常显著的影响.表明电子的自旋自由度可以用于调整低维半导体器件中的热电效应及器件的工作条件.Linear thermoelectric effect in a system composed of semiconductor quantum dot under the conditions of infinite small electric bias and temperature difference is studied. The thermoelectrical quantities including electric conductance, thermal conductance, Seebeck coefficient and the figure of merit are calculated with the help of the non - equilibrium Greens function method. It is found that when the quantum dot is coupled to external ferromagnetic leads, moving electrons will become spin - polarized, imposing distinct influence on the above physical quantities. This indicates a way of adjusting thermoelectrical devices and the working conditions based on the electron soin dettree of freedom.

关 键 词：量子点 热电效应 电子自旋 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术] TN702[自动化与计算机技术—计算机科学与技术]