Closely separated one-dimensional wires: coupled ballistic conduction, wave function hybridization and compressibility investigations

被引：41

作者：

Castleton, IM ^{[1
]}

Davies, AG ^{[1
]}

Hamilton, AR ^{[1
]}

Frost, JEF ^{[1
]}

Simmons, MY ^{[1
]}

Ritchie, DA ^{[1
]}

Pepper, M ^{[1
]}

机构：

[1] Univ Cambridge, Cavendish Lab, Cambridge CB3 0HE, England

来源：

PHYSICA B-CONDENSED MATTER | 1998年 / 249卷

关键词：

one-dimensional; coupled quantum wires;

D O I：

10.1016/S0921-4526(98)00089-1

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We report the experimental study of a system comprising two parallel quasi-one-dimensional (1D) ballistic wires formed in a GaAs-AlxGa1-xAs double quantum well structure. A unique surface gate geometry allows the device to be tuned smoothly from a configuration comprising a pair of vertically aligned 1D ballistic wires, to a single 1D ballistic wire in either the upper or lower 2DES. We investigate coupled ballistic conduction in two samples with contrasting wire separations (35 and 300 Angstrom). The strongly coupled sample exhibits a cross-over from double to single wire conduction as the number of occupied 1D subbands is reduced. The weakly coupled sample is used to observe directly variations in the compressibility of a single ballistic channel arising from the discrete 1D density of states. (C) 1998 Elsevier Science B.V. All rights reserved.

引用

页码：157 / 161

页数：5

共 14 条

[1] Hybridization of single- and double-layer behavior in a double-quantum-well structure [J].

Davies, AG ;

Barnes, CHW ;

Zolleis, KR ;

Nicholls, JT ;

Simmons, MY ;

Ritchie, DA .

PHYSICAL REVIEW B, 1996, 54 (24) :17331-17334

[2] COMPRESSIBILITY OF THE 2-DIMENSIONAL ELECTRON-GAS - MEASUREMENTS OF THE ZERO-FIELD EXCHANGE ENERGY AND FRACTIONAL QUANTUM HALL GAP [J].

EISENSTEIN, JP ;

PFEIFFER, LN ;

WEST, KW .

PHYSICAL REVIEW B, 1994, 50 (03) :1760-1778

[3]

HEIMAN D, 1995, HIGH MAGNETIC FIELDS, P78

[4] CONDUCTIVITY OF AN INTERACTING 2-CHANNEL TOMONAGA-LUTTINGER MODEL [J].

KIMURA, T ;

KUROKI, K ;

AOKI, H ;

ETO, M .

PHYSICAL REVIEW B, 1994, 49 (23) :16852-16855

[5] TRANSPORT-PROPERTIES OF COUPLED ONE-DIMENSIONAL INTERACTING ELECTRON-SYSTEMS WITH IMPURITIES [J].

KIMURA, T ;

KUROKI, K ;

AOKI, H .

PHYSICAL REVIEW B, 1995, 51 (19) :13860-13863

[6] ELECTROSTATICALLY CONTROLLED DOUBLE-QUANTUM-WIRE ELECTRON INTERFEROMETERS [J].

OKUDA, M .

JOURNAL OF APPLIED PHYSICS, 1995, 78 (02) :1039-1049

[7]

SIMPSON PJ, 1993, APPL PHYS LETT, V63, P3193

[8] 1-DIMENSIONAL QUANTIZED BALLISTIC RESISTORS IN PARALLEL CONFIGURATION [J].

SMITH, CG ;

PEPPER, M ;

NEWBURY, R ;

AHMED, H ;

HASKO, DG ;

PEACOCK, DC ;

FROST, JEF ;

RITCHIE, DA ;

JONES, GAC ;

HILL, G .

JOURNAL OF PHYSICS-CONDENSED MATTER, 1989, 1 (37) :6763-6770

[9] CAPACITANCE OSCILLATIONS IN ONE-DIMENSIONAL ELECTRON-SYSTEMS [J].

SMITH, TP ;

ARNOT, H ;

HONG, JM ;

KNOEDLER, CM ;

LAUX, SE ;

SCHMID, H .

PHYSICAL REVIEW LETTERS, 1987, 59 (24) :2802-2805

[10] ENERGY-LEVEL LOCKING IN QUANTUM CONDUCTORS [J].

SUN, YL ;

KIRCZENOW, G .

PHYSICAL REVIEW LETTERS, 1994, 72 (15) :2450-2453

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