Details
| Original language | English |
|---|---|
| Pages (from-to) | 164-168 |
| Number of pages | 5 |
| Journal | Physica B: Condensed Matter |
| Volume | 298 |
| Issue number | 1-4 |
| Publication status | Published - 1 Apr 2001 |
Abstract
We investigate the time dependent thermal relaxation of a two-dimensional electron system (2DES) in the fractional quantum Hall regime, where ballistic phonons are used to heat up the system to a non-equilibrium temperature. The thermal relaxation of a 2DES at ν = 1/2 can be described in terms of a broad band emission of phonons, with a temperature dependence proportional to T4. In contrast, the relaxation at fractional filling ν = 2/3 is characterized by phonon emission around a single energy, the magneto-roton gap. This leads to a strongly reduced energy relaxation rate compared to ν = 1/2 with only a weak temperature dependence for temperatures 150 mK < T < 400 mK.
Keywords
- Energy relaxation, Fractional quantum Hall effect, Magneto-roton gap, Phonons
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. 164-168.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Phonon emission and absorption in the fractional quantum Hall effect
AU - Schulze-Wischeler, F.
AU - Zeitler, U.
AU - Monka, M.
AU - Hohls, F.
AU - Haug, R. J.
AU - Eberl, K.
N1 - Funding information: This work is supported by the Deutsche Forschungsgemeinschaf, Project no. ZE 463/3-1.
PY - 2001/4/1
Y1 - 2001/4/1
N2 - We investigate the time dependent thermal relaxation of a two-dimensional electron system (2DES) in the fractional quantum Hall regime, where ballistic phonons are used to heat up the system to a non-equilibrium temperature. The thermal relaxation of a 2DES at ν = 1/2 can be described in terms of a broad band emission of phonons, with a temperature dependence proportional to T4. In contrast, the relaxation at fractional filling ν = 2/3 is characterized by phonon emission around a single energy, the magneto-roton gap. This leads to a strongly reduced energy relaxation rate compared to ν = 1/2 with only a weak temperature dependence for temperatures 150 mK < T < 400 mK.
AB - We investigate the time dependent thermal relaxation of a two-dimensional electron system (2DES) in the fractional quantum Hall regime, where ballistic phonons are used to heat up the system to a non-equilibrium temperature. The thermal relaxation of a 2DES at ν = 1/2 can be described in terms of a broad band emission of phonons, with a temperature dependence proportional to T4. In contrast, the relaxation at fractional filling ν = 2/3 is characterized by phonon emission around a single energy, the magneto-roton gap. This leads to a strongly reduced energy relaxation rate compared to ν = 1/2 with only a weak temperature dependence for temperatures 150 mK < T < 400 mK.
KW - Energy relaxation
KW - Fractional quantum Hall effect
KW - Magneto-roton gap
KW - Phonons
UR - http://www.scopus.com/inward/record.url?scp=0035303727&partnerID=8YFLogxK
U2 - 10.1016/S0921-4526(01)00293-9
DO - 10.1016/S0921-4526(01)00293-9
M3 - Article
AN - SCOPUS:0035303727
VL - 298
SP - 164
EP - 168
JO - Physica B: Condensed Matter
JF - Physica B: Condensed Matter
SN - 0921-4526
IS - 1-4
ER -