CAJ | 학술논문

电子的隧穿时间是描述量子器件动态工作范围的重要指标.本文考虑k3 Dresselhaus自旋轨道耦合效应对系统哈密顿量的修正,结合转移矩阵方法和龙格-库塔法来解含时薛定谔方程,进而讨论了电子在非磁半导体对称双势垒结构中的透射系数及隧穿寿命等问题.研究结果发现:由于k3 Dresselhaus自旋轨道耦合效应使自旋简并消除,并在时间域内得到了表达,导致自旋向上和自旋向下电子的透射峰发生了自旋劈裂;不同自旋取向的电子构建时间和隧穿寿命不同,这是导致自旋极化的原因之一;电子的自旋极化在时间上趋于稳定.
전자적수천시간시묘술양자기건동태공작범위적중요지표.본문고필k3 Dresselhaus자선궤도우합효응대계통합밀돈량적수정,결합전이구진방법화룡격-고탑법래해함시설정악방정,진이토론료전자재비자반도체대칭쌍세루결구중적투사계수급수천수명등문제.연구결과발현:유우k3 Dresselhaus자선궤도우합효응사자선간병소제,병재시간역내득도료표체,도치자선향상화자선향하전자적투사봉발생료자선벽렬;불동자선취향적전자구건시간화수천수명불동,저시도치자선겁화적원인지일;전자적자선겁화재시간상추우은정.
@@@@Tunneling time is an important factor to describe quantum electronic device. In this paper, the dynamic problem of spin-dependent tunneling is investigated by solving the time-dependent Schr¨odinger equation. The transmission coefficient and tunneling lifetime are discussed by use of mixing transfer-matrix and Runge-Kutta method. The k3 Dresselhaus term is considered to correct the effective Hamiltonian of the system in our calculation. The results show that the transmission peak of the electrons with different spin orien-tations split obviously. The building time and the tunneling lifetime through the double-barrier structure of AlxGa1?xSb material are different for the spin-down electron and spin-up electron. These time-dependent properties depend on the electronic spin orientation. It can be considered as one of reasons for spin polarization to appear. Additionally, the steady spin-polarization emerges in the well due to the k3 Dresselhaus spin-orbit coupling.