物理学报Issue(8)：1-7,7.DOI:10.7498/aps.62.087303
对称双势垒量子阱中自旋极化输运的时间特性
Time of spin-polarized tunneling through a symmetric double-barrier quantum well structure∗
摘要
Abstract
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.关键词
自旋极化输运/透射系数/隧穿寿命/自旋极化率Key words
spin-dependent transport/transmission coefficient/tunneling lifetime/polarization efficiency引用本文复制引用
王瑞琴,宫箭†,武建英,陈军..对称双势垒量子阱中自旋极化输运的时间特性[J].物理学报,2013,(8):1-7,7.基金项目
国家自然科学基金(批准号:50972118,50977071,51177121)资助的课题.*Project supported by the National Natural Science Foundation of China (Grant Nos.50972118,50977071,51177121) （批准号:50972118,50977071,51177121）
