Details
| Original language | English |
|---|---|
| Pages (from-to) | 88-92 |
| Number of pages | 5 |
| Journal | Physica B: Condensed Matter |
| Volume | 298 |
| Issue number | 1-4 |
| Publication status | Published - 1 Apr 2001 |
Abstract
We present high frequency measurements of the diagonal conductivity σxx of a two-dimensional electron system in the integer quantum Hall regime. The width of the σxx peaks between QHE minima is analyzed within the framework of scaling theory using both temperature (T = 100-700 mK) and frequency (f ≤ 6 GHz) in a two parameter scaling ansatz. For the plateau transition width Δν we find scaling behaviour for both its temperature dependence as well as its frequency dependence. However, the corresponding scaling exponent for temperature (κ = 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 σc = 0.17e2/h, virtually independent of temperature and filling factor, and deviating significantly from the proposed universal value 0.5e2/h.
Keywords
- High frequency conductivity, Quantum Hall effect, Scaling theory
ASJC Scopus subject areas
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Physics and Astronomy(all)
- Condensed Matter Physics
- Engineering(all)
- Electrical and Electronic Engineering
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In: Physica B: Condensed Matter, Vol. 298, No. 1-4, 01.04.2001, p. 88-92.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - High frequency conductivity in the quantum Hall effect
AU - Hohls, F.
AU - Zeitler, U.
AU - Haug, R. J.
AU - Pierz, K.
PY - 2001/4/1
Y1 - 2001/4/1
N2 - We present high frequency measurements of the diagonal conductivity σxx of a two-dimensional electron system in the integer quantum Hall regime. The width of the σxx peaks between QHE minima is analyzed within the framework of scaling theory using both temperature (T = 100-700 mK) and frequency (f ≤ 6 GHz) in a two parameter scaling ansatz. For the plateau transition width Δν we find scaling behaviour for both its temperature dependence as well as its frequency dependence. However, the corresponding scaling exponent for temperature (κ = 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 σc = 0.17e2/h, virtually independent of temperature and filling factor, and deviating significantly from the proposed universal value 0.5e2/h.
AB - We present high frequency measurements of the diagonal conductivity σxx of a two-dimensional electron system in the integer quantum Hall regime. The width of the σxx peaks between QHE minima is analyzed within the framework of scaling theory using both temperature (T = 100-700 mK) and frequency (f ≤ 6 GHz) in a two parameter scaling ansatz. For the plateau transition width Δν we find scaling behaviour for both its temperature dependence as well as its frequency dependence. However, the corresponding scaling exponent for temperature (κ = 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 σc = 0.17e2/h, virtually independent of temperature and filling factor, and deviating significantly from the proposed universal value 0.5e2/h.
KW - High frequency conductivity
KW - Quantum Hall effect
KW - Scaling theory
UR - http://www.scopus.com/inward/record.url?scp=0035304733&partnerID=8YFLogxK
U2 - 10.1016/S0921-4526(01)00266-6
DO - 10.1016/S0921-4526(01)00266-6
M3 - Article
AN - SCOPUS:0035304733
VL - 298
SP - 88
EP - 92
JO - Physica B: Condensed Matter
JF - Physica B: Condensed Matter
SN - 0921-4526
IS - 1-4
ER -