A New Class of Resonances at the Edge of the Two Dimensional Electron Gas

Дата и время публикации : 1996-01-31T19:56:00Z

Авторы публикации и институты :
N. B. Zhitenev (MIT)
M. Brodsky (MIT)
R. C. Ashoori (MIT)
M. R. Melloch (Purdue University)

Ссылка на журнал-издание: Phys. Rev. Lett. 77, 1833-1836 (1996)
Коментарии к cтатье: 13 pages (revtex) including 4 figures
Первичная категория: cond-mat

Все категории : cond-mat

Краткий обзор статьи: We measure the frequency dependent capacitance of a gate covering the edge and part of a two-dimensional electron gas in the quantum Hall regime. In applying a positive gate bias, we create a metallic puddle under the gate surrounded by an insulating region. Charging of the puddle occurs via electron tunneling from a metallic edge channel. Analysis of the data allows direct extraction of this tunneling conductance. Novel conductance resonances appear as a function of gate bias. Samples with gates ranging from 1-170~$mu$m along the edge display strikingly similar resonance spectra. The data suggest the existence of unexpected structure, homogeneous over long length scales, at the sample edge.

Category: Physics