CHARGE OSCILLATIONS IN EDGE STATES AND DOUBLE-FREQUENCY AHARONOV-BOHM EFFECTS AROUND A TUNABLE OBSTACLE

被引：25

作者：

SIMPSON, PJ ^{[1
]}

FORD, CJB ^{[1
]}

MACE, DR ^{[1
]}

ZAILER, I ^{[1
]}

YOSEFIN, M ^{[1
]}

PEPPER, M ^{[1
]}

NICHOLLS, JT ^{[1
]}

RITCHIE, DA ^{[1
]}

FROST, JEF ^{[1
]}

GRIMSHAW, MP ^{[1
]}

JONES, GAC ^{[1
]}

机构：

[1] TOSHIBA CAMBRIDGE RES CTR,CAMBRIDGE CB4 4WE,ENGLAND

来源：

SURFACE SCIENCE | 1994年 / 305卷 / 1-3期

关键词：

D O I：

10.1016/0039-6028(94)90935-0

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We have observed a new phenomenon of charge oscillations in small isolated edge states in the quantum Hall regime. We have developed a unique method of contacting an isolated metal dot independently of the other gates, using a patterned layer of insulator. Using this technique we have made two individually tunable ballistic channels in parallel. In a perpendicular magnetic field edge states form a ring around the dot, with a variable constriction on either side across which they can communicate. Electrons orbiting around the ring interfere with themselves, and a series of single particle (SP) states forms. By fine-tuning the individual constriction widths we can generate huge Aharonov-Bohm (AB) oscillations, and extremely well defined oscillations. In addition, in certain field ranges, we observe a very clear double AB frequency, at times completely losing a distinguishable fundamental frequency. We propose that the discreteness of the SP states gives rise to a charging effect, which modifies the tunnelling of the outermost edge state through the device, and also acts to evenly intersperse the energy levels of all the edge states encircling the dot.

引用

页码：453 / 459

页数：7

共 9 条

[1] INFLUENCE OF ADIABATICALLY TRANSMITTED EDGE CHANNELS ON SINGLE-ELECTRON TUNNELING THROUGH A QUANTUM DOT [J].