Indexed by:
Abstract:
We design a four InAs quantum dot system in which two leads are irradiated by terahertz light fields. The average current through the system is obtained by means of non-equilibrium Green's function theory. Typical photonassisted tunneling is observed in the current energy spectrum. 100% polarization can be achieved by adjusting the intensity of Zeeman magnetic field or the amplitude of terahertz light field. As the frequency of terahertz light field is invariant, a zero current can be obtained by adjusting the amplitude of the terahertz light field, indicating an optically controlled quantum switch device. The spin polarization can be converted between 0 and 1 by tuning the energy level of quantum dots, suggesting a physical scheme of a polarization pulse device. Moreover, the system can be constructed as a terahertz detector due to the oscillation properties of spin polarization. The present work sheds lights onto the design of quantum computing and spin-dependent quantum devices.
Keyword:
Reprint 's Address:
Email:
Version:
Source :
PHYSICA B-CONDENSED MATTER
ISSN: 0921-4526
Year: 2022
Volume: 641
2 . 8
JCR@2022
2 . 8 0 0
JCR@2023
ESI Discipline: PHYSICS;
ESI HC Threshold:55
JCR Journal Grade:2
CAS Journal Grade:3
Affiliated Colleges:
查看更多>>操作日志
管理员 2024-12-25 19:02:06 更新被引
管理员 2024-09-06 00:36:57 更新被引
管理员 2024-07-01 04:30:14 更新被引
管理员 2024-03-29 04:47:29 更新被引