CAJ | 학술논문

研究半导体量子点中温度差和电压趋近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调整低维半导体器件中的热电效应及器件的工作条件.
연구반도체양자점중온도차화전압추근령조건하적선성열전효응,용비평형격림함수방법계산료계통적전도솔、열도솔、새패극상수화품질자.발현재양자점여철자인선우합적기건중,류과계통적전자장변득자선겁화,종이대이상물리양산생비상현저적영향.표명전자적자선자유도가이용조정저유반도체기건중적열전효응급기건적공작조건.
Linear thermoelectric effect in a system composed of semiconductor quantum dot under the condi -tions of infinite small electric bias and temperature difference is studied .The thermoelectrical quantities inclu-ding electric conductance, thermal conductance, Seebeck coefficient and the figure of merit are calculated with the help of the non-equilibrium Green's 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 a-bove physical quantities.This indicates a way of adjusting thermoelectrical devices and the working conditions based on the electron spin degree of freedom .