Terahertz photoconductivity in GaAs/AlGaAs and HgTe/HgCdTe quantum Hall devices

被引：5

作者：

Stellmach, C. ^{[1
]}

Bonk, R. ^{[1
]}

Vasilyev, Y. B. ^{[1
,2
]}

Hirsch, A. ^{[1
]}

Hein, G. ^{[3
]}

Becker, C. R. ^{[4
]}

Nachtwei, G. ^{[1
]}

机构：

[1] TU Braunschweig, Inst Angew Phys, Mendelssohnstr 2, D-38106 Braunschweig, Germany

[2] AF Ioffe Phys Tech Inst, St Petersburg 194021, Russia

[3] Physik Tech Bundesanstalt, D-38116 Braunschweig, Germany

[4] Physik Inst Univ Wurzbur, D-97074 Wurzburg, Germany

来源：

PHYSICA STATUS SOLIDI C - CURRENT TOPICS IN SOLID STATE PHYSICS, VOL 3, NO 7 | 2006年 / 3卷 / 07期

关键词：

D O I：

10.1002/pssc.200668096

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We present measurements of the THz photoconductivity on different quantum Hall systems. GaAs/AlGaAs and HgTe/HgCdTe (MCT) heterostructures with Hall-bar and Corbino geometry are investigated. A recipe for the preparation of metallic Corbino contacts on MCT is shown. The system is excited by the radiation of a p-Ge laser (tunable from 1.7 to 2.5 THz) and the photoresponse (PR) is measured versus the magnetic field B. We observe enhanced PR around integer filling factors (bolometric PR) and cyclotron resonance (CR) effects. Because of the lower effective mass in MCT, the CR in this system appears at a relatively low magnetic field (approximate to 2T). This is appropriate for possible applications. Finally we present time resolved measurements of the PR on the GaAs system. We find relaxation times from about 10 to over 200 ns, which depend on the geometry, the applied source-drain voltage and the on mobility of the sample. (c) 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

引用

页码：2510 / +

页数：2

共 9 条

[1]

BONK R, 2006, THESIS TU BRAUNSCHWE

[2]

GORNIK E, 1991, OPT QUANT ELECTRON, V23, P111

[3]

GOSCHENHOFER F, 1998, THESIS U WURZBURG GE

[4] Dynamics of the far-infrared photoresponse in quantum Hall systems [J].

Kalugin, NG ;

Vasilyev, YB ;

Suchalkin, SD ;

Nachtwei, G ;

Sagol, BE ;

Eberl, K .

PHYSICAL REVIEW B, 2002, 66 (08) :853081-853087

[5] Performance of high-sensitivity quantum Hall far infrared photodetectors [J].

Kawaguchi, Y ;

Hirakawa, K ;

Saeki, M ;

Yamanaka, K ;

Komiyama, S .

APPLIED PHYSICS LETTERS, 2002, 80 (01) :136-138

[6] OBSERVATION OF CYCLOTRON-RESONANCE IN THE PHOTOCONDUCTIVITY OF TWO-DIMENSIONAL ELECTRONS [J].

MAAN, JC ;

ENGLERT, T ;

TSUI, DC ;

GOSSARD, AC .

APPLIED PHYSICS LETTERS, 1982, 40 (07) :609-610

[7] PHOTOCONDUCTIVITY ON GAAS-ALXGA1-XAS HETEROSTRUCTURES [J].

STEIN, D ;

EBERT, G ;

VONKLITZING, K ;

WEIMANN, G .

SURFACE SCIENCE, 1984, 142 (1-3) :406-411

[8] Fast terahertz detectors with spectral tunability based on quantum Hall Corbino devices [J].

Stellmach, C ;

Hirsch, A ;

Nachtwei, G ;

Vasilyev, YB ;

Kalugin, NG ;

Hein, G .

APPLIED PHYSICS LETTERS, 2005, 87 (13) :1-3

[9] THE QUANTIZED HALL-EFFECT [J].

VONKLITZING, K .

REVIEWS OF MODERN PHYSICS, 1986, 58 (03) :519-531

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