Symmetry in the insulator-quantum-Hall-insulator transitions observed in a Ge/SiGe quantum well

被引：26

作者：

Hilke, M ^{[1
]}

Shahar, D

Song, SH

Tsui, DC

Xie, YH

Monroe, D

机构：

[1] Princeton Univ, Dept Elect Engn, Princeton, NJ 08544 USA

[2] AT&T Bell Labs, Lucent Technol, Murray Hill, NJ 07974 USA

来源：

PHYSICAL REVIEW B | 1997年 / 56卷 / 24期

关键词：

D O I：

10.1103/PhysRevB.56.R15545

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We examine the magnetic-field-driven insulator-quantum-Hall-insulator transitions of the two-dimensional hole gas in a Ge/SiGe quantum well. We observe direct transitions between low and high magnetic-field insulators and the nu=1 quantum Hall state. With increasing magnetic field, the transitions from insulating to quantum Hall and quantum Hall to insulating are very similar with respect to their transport properties. We address the temperature dependence around the transitions and show that the characteristic energy scale for the high-field transition is larger.

引用

页码：R15545 / R15548

页数：4

共 20 条

[1] SCALING THEORY OF LOCALIZATION - ABSENCE OF QUANTUM DIFFUSION IN 2 DIMENSIONS [J].

ABRAHAMS, E ;

ANDERSON, PW ;

LICCIARDELLO, DC ;

RAMAKRISHNAN, TV .

PHYSICAL REVIEW LETTERS, 1979, 42 (10) :673-676

[2] Landau level mixing and levitation of extended states in two dimensions [J].

Haldane, FDM ;

Yang, K .

PHYSICAL REVIEW LETTERS, 1997, 78 (02) :298-301

[3] MAGNETIC-FIELD-INDUCED INSULATOR-QUANTUM HALL-INSULATOR TRANSITION IN A DISORDERED 2-DIMENSIONAL ELECTRON-GAS [J].

HUGHES, RJF ;

NICHOLLS, JT ;

FROST, JEF ;

LINFIELD, EH ;

PEPPER, M ;

FORD, CJB ;

RITCHIE, DA ;

JONES, GAC ;

KOGAN, E ;

KAVEH, M .

JOURNAL OF PHYSICS-CONDENSED MATTER, 1994, 6 (25) :4763-4770

[4]

Janssen M., 1994, INTRO THEORY INTEGER

[5] QUANTUM LIQUID VERSUS ELECTRON SOLID AROUND V=1/5 LANDAU-LEVEL FILLING [J].

JIANG, HW ;

WILLETT, RL ;

STORMER, HL ;

TSUI, DC ;

PFEIFFER, LN ;

WEST, KW .

PHYSICAL REVIEW LETTERS, 1990, 65 (05) :633-636

[6] OBSERVATION OF MAGNETIC-FIELD-INDUCED DELOCALIZATION - TRANSITION FROM ANDERSON INSULATOR TO QUANTUM HALL CONDUCTOR [J].

JIANG, HW ;

JOHNSON, CE ;

WANG, KL ;

HANNAHS, ST .

PHYSICAL REVIEW LETTERS, 1993, 71 (09) :1439-1442

[7]

KHMELNITSKII DE, 1983, JETP LETT+, V38, P552

[8] GLOBAL PHASE-DIAGRAM IN THE QUANTUM HALL-EFFECT [J].

KIVELSON, S ;

LEE, DH ;

ZHANG, SC .

PHYSICAL REVIEW B, 1992, 46 (04) :2223-2238

[9] POSSIBLE METAL-INSULATOR-TRANSITION AT B=0 IN 2 DIMENSIONS [J].

KRAVCHENKO, SV ;

KRAVCHENKO, GV ;

FURNEAUX, JE ;

PUDALOV, VM ;

DIORIO, M .

PHYSICAL REVIEW B, 1994, 50 (11) :8039-8042

[10] LEVITATION OF EXTENDED-STATE BANDS IN A STRONG MAGNETIC-FIELD [J].

LAUGHLIN, RB .

PHYSICAL REVIEW LETTERS, 1984, 52 (25) :2304-2304

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