中国物理B ›› 2017, Vol. 26 ›› Issue (2): 27301-027301.doi: 10.1088/1674-1056/26/2/027301
• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇 下一篇
Chun-Lei Li(李春雷), Yong Guo(郭永), Xiao-Ming Wang(王小明), Yuan Lv(律原)
Chun-Lei Li(李春雷)1, Yong Guo(郭永)2,3, Xiao-Ming Wang(王小明)4, Yuan Lv(律原)1
摘要: We have investigated the photon-assisted shot noise properties in the magnetic field tunable heterostructures.} Transport properties of the model structure are strongly dependent on the oscillatory field and the magnetic field. In this structure, electrons can absorb or emit one or multi-photons to reach the quasi-bound state. As a result, the transmission properties are affected considerably by photon-assisted tunneling and these features cause the nontrivial variations in the shot noise and Fano factor. It is found that the shot noise becomes spin-dependent and can be modulated not only by the magnetic field, but also by the oscillatory field. Both the spin-up and spin-down components of the shot noise can be greatly suppressed by the magnetic field, and can also be drastically enhanced by the harmonically driven field. Furthermore, with increasing external magnetic field, it is important to note that the enhanced intensity is decreased, even suppressed. These results suggest another method to suppress the shot noise via modulating the oscillatory field at a diluted-magnetic-semiconductors/semiconductor structure.
中图分类号: (Multilayers)