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Titolo:
High frequency conductivity in the quantum Hall effect
Autore:
Hohls, F; Zeitler, U; Haug, RJ; Pierz, K;
Indirizzi:
Univ Hannover, Inst Festkorperforsch, D-30167 Hannover, Germany Univ Hannover Hannover Germany D-30167 forsch, D-30167 Hannover, Germany Phys Tech Bundesanstalt, D-38116 Braunschweig, Germany Phys Tech Bundesanstalt Braunschweig Germany D-38116 aunschweig, Germany
Titolo Testata:
PHYSICA B
fascicolo: 1-4, volume: 298, anno: 2001,
pagine: 88 - 92
SICI:
0921-4526(200104)298:1-4<88:HFCITQ>2.0.ZU;2-X
Fonte:
ISI
Lingua:
ENG
Soggetto:
INTEGER;
Keywords:
quantum Hall effect; high frequency conductivity; scaling theory;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
9
Recensione:
Indirizzi per estratti:
Indirizzo: Hohls, F Univ Hannover, Inst Festkorperforsch, Appelstr 2, D-30167 Hannover, Germany Univ Hannover Appelstr 2 Hannover Germany D-30167 nover, Germany
Citazione:
F. Hohls et al., "High frequency conductivity in the quantum Hall effect", PHYSICA B, 298(1-4), 2001, pp. 88-92

Abstract

We present high frequency measurements of the diagonal conductivity sigma (xx) of a two-dimensional electron system in the integer quantum Hall regime. The width of the sigma (xx) peaks between QHE minima is analyzed within the framework of scaling theory using both temperature(T = 100-700 mK) and frequency (f less than or equal to 6 GHz) in a two parameter scaling ansatz. For the plateau transition width Deltav we iind scaling behaviour for both its temperature dependence as well as its frequency dependence. However, the corresponding scaling exponent for temperature (kappa = 0.42) significantly differs from the one deduced for frequency scaling (c = 0.6). Additionally, we use the high frequency experiments to suppress the contact resistances that strongly influences DC measurements. We find an intrinsic critical conductivity sigma (c) = 0.17e(2)/h, virtually independent of temperatureand tilling factor, and deviating significantly from the proposed universal value 0.5e(2)/h. (C) 2001 Elsevier Science B.V. All rights reserved.

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Documento generato il 02/06/20 alle ore 02:07:25