RECTIFICATION OF CURRENT IN QUANTUM POINT CONTACTS MADE FROM ALGAAS-GAAS HETEROSTRUCTURES

Rafael J. Taboryski; A. K. Geim; Poul Erik Lindelof

RECTIFICATION OF CURRENT IN QUANTUM POINT CONTACTS MADE FROM ALGAAS-GAAS HETEROSTRUCTURES

Rafael J. Taboryski, A. K. Geim, Poul Erik Lindelof

Research output: Contribution to journal › Conference article › Research › peer-review

Abstract

We report a conductance asymmetry of quantum point contacts (QPC) at near-zero applied current biases. The asymmetry is measured at low temperatures as a rectified dc voltage response to an applied small amplitude ac current. When measured as a function of negative gate-voltage, the rectified signal oscillates. For some of the samples this oscillatory behavior scales linearly with the applied ac current amplitude, which indicates only one step-like non-linearity in differential resistance vs. current. The value of the step is of the order of a few tens of Ohms on a background of several kOhms, and embedded in intrinsic random telegraph signal (RTS) noise. The step could be verified also by a direct measurement of differential resistance vs. dc current. We believe a two-level impurity configuration near the constriction is responsible for the step-like differential resistance.

Original language	English
Journal	Physica B: Condensed Matter
Volume	194
Pages (from-to)	1131-1132
ISSN	0921-4526
Publication status	Published - 1994
Externally published	Yes
Event	20th International Conference on Low Temperature Physics - Eugne, OR, United States Duration: 4 Aug 1993 → 11 Aug 1993 Conference number: 20

Conference

Conference	20th International Conference on Low Temperature Physics
Number	20
Country	United States
City	Eugne, OR
Period	04/08/1993 → 11/08/1993

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Cite this

@inproceedings{de245f4f4354489391ce07eec65edfb5,

title = "RECTIFICATION OF CURRENT IN QUANTUM POINT CONTACTS MADE FROM ALGAAS-GAAS HETEROSTRUCTURES",

abstract = "We report a conductance asymmetry of quantum point contacts (QPC) at near-zero applied current biases. The asymmetry is measured at low temperatures as a rectified dc voltage response to an applied small amplitude ac current. When measured as a function of negative gate-voltage, the rectified signal oscillates. For some of the samples this oscillatory behavior scales linearly with the applied ac current amplitude, which indicates only one step-like non-linearity in differential resistance vs. current. The value of the step is of the order of a few tens of Ohms on a background of several kOhms, and embedded in intrinsic random telegraph signal (RTS) noise. The step could be verified also by a direct measurement of differential resistance vs. dc current. We believe a two-level impurity configuration near the constriction is responsible for the step-like differential resistance.",

author = "Taboryski, {Rafael J.} and Geim, {A. K.} and Lindelof, {Poul Erik}",

year = "1994",

language = "English",

volume = "194",

pages = "1131--1132",

journal = "Physica B: Condensed Matter",

issn = "0921-4526",

publisher = "Elsevier",

note = "20th International Conference on Low Temperature Physics ; Conference date: 04-08-1993 Through 11-08-1993",

}

TY - GEN

T1 - RECTIFICATION OF CURRENT IN QUANTUM POINT CONTACTS MADE FROM ALGAAS-GAAS HETEROSTRUCTURES

AU - Taboryski, Rafael J.

AU - Geim, A. K.

AU - Lindelof, Poul Erik

N1 - Conference code: 20

PY - 1994

Y1 - 1994

N2 - We report a conductance asymmetry of quantum point contacts (QPC) at near-zero applied current biases. The asymmetry is measured at low temperatures as a rectified dc voltage response to an applied small amplitude ac current. When measured as a function of negative gate-voltage, the rectified signal oscillates. For some of the samples this oscillatory behavior scales linearly with the applied ac current amplitude, which indicates only one step-like non-linearity in differential resistance vs. current. The value of the step is of the order of a few tens of Ohms on a background of several kOhms, and embedded in intrinsic random telegraph signal (RTS) noise. The step could be verified also by a direct measurement of differential resistance vs. dc current. We believe a two-level impurity configuration near the constriction is responsible for the step-like differential resistance.

AB - We report a conductance asymmetry of quantum point contacts (QPC) at near-zero applied current biases. The asymmetry is measured at low temperatures as a rectified dc voltage response to an applied small amplitude ac current. When measured as a function of negative gate-voltage, the rectified signal oscillates. For some of the samples this oscillatory behavior scales linearly with the applied ac current amplitude, which indicates only one step-like non-linearity in differential resistance vs. current. The value of the step is of the order of a few tens of Ohms on a background of several kOhms, and embedded in intrinsic random telegraph signal (RTS) noise. The step could be verified also by a direct measurement of differential resistance vs. dc current. We believe a two-level impurity configuration near the constriction is responsible for the step-like differential resistance.

M3 - Conference article

VL - 194

SP - 1131

EP - 1132

JO - Physica B: Condensed Matter

JF - Physica B: Condensed Matter

SN - 0921-4526

T2 - 20th International Conference on Low Temperature Physics

Y2 - 4 August 1993 through 11 August 1993

ER -