INTERIOR CONTACTS FOR PROBING THE EQUILIBRIUM BETWEEN MAGNETIC EDGE CHANNELS IN THE QUANTUM HALL-EFFECT

被引:18
作者
FAIST, J
GUERET, P
MEIER, HP
机构
[1] IBM Research Division, Zurich Research Laboratory
来源
PHYSICAL REVIEW B | 1991年 / 43卷 / 11期
关键词
D O I
10.1103/PhysRevB.43.9332
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We demonstrate that interior voltage probes may be used as a class of partially coupled contacts, able to feed or preferentially detect the innermost edge channel, as opposed to quantum point contacts or gated structures, which are simultaneously coupled to the N outermost edge channels. This unique feature of interior contacts has allowed us to measure the potential of the innermost edge channel directly. We find that a significant potential drop occurs between Hall plateaus due to the backscattering in the bulk of the sample, as predicted in a previous report. The temperature dependence of this effect is discussed. The data confirm the low interchannel scattering rate between the innermost and the N-1 other spin-degenerate edge channels. Finally, it is found that interior contacts used as current injectors preferentially populate the innermost channel, thus enhancing the Shubnikov-de Haas oscillations.
引用
收藏
页码:9332 / 9335
页数:4
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