Details
| Original language | English |
|---|---|
| Pages (from-to) | 409-420 |
| Number of pages | 12 |
| Journal | Physica Status Solidi (B) Basic Research |
| Volume | 245 |
| Issue number | 2 |
| Publication status | Published - 1 Feb 2008 |
Abstract
The properties of a fractional quantum Hall system has been investigated with phonon experiments and with transport experiments. A detailed description of the phonon absorption technique is given. We measure the relative specific heat in the fractional quantum Hall effect regime at various filling factors. We use phonons to measure the activation gap Δ of the fractional quantum Hall states at constant fillings as a function of the perpendicular magnetic field B. At a given filling factor nearly all gaps measured show a square-root dependence on the magnetic field and can be described by one single fit parameter related to the composite fermion effective mass. In addition, we present transport experiments to deduce energy gaps. Here, an astonish linear dependence of Δ on B is observed for a number of fractional filling factors.
ASJC Scopus subject areas
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Physics and Astronomy(all)
- Condensed Matter Physics
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In: Physica Status Solidi (B) Basic Research, Vol. 245, No. 2, 01.02.2008, p. 409-420.
Research output: Contribution to journal › Review article › Research › peer review
}
TY - JOUR
T1 - Phonon and transport measurements in the fractional quantum Hall effect
AU - Schulze-Wischeler, Fritz
AU - Dethlefsen, Annelene F.
AU - Hohls, Frank
AU - Zeitler, Uli
AU - Haug, Rolf J.
PY - 2008/2/1
Y1 - 2008/2/1
N2 - The properties of a fractional quantum Hall system has been investigated with phonon experiments and with transport experiments. A detailed description of the phonon absorption technique is given. We measure the relative specific heat in the fractional quantum Hall effect regime at various filling factors. We use phonons to measure the activation gap Δ of the fractional quantum Hall states at constant fillings as a function of the perpendicular magnetic field B. At a given filling factor nearly all gaps measured show a square-root dependence on the magnetic field and can be described by one single fit parameter related to the composite fermion effective mass. In addition, we present transport experiments to deduce energy gaps. Here, an astonish linear dependence of Δ on B is observed for a number of fractional filling factors.
AB - The properties of a fractional quantum Hall system has been investigated with phonon experiments and with transport experiments. A detailed description of the phonon absorption technique is given. We measure the relative specific heat in the fractional quantum Hall effect regime at various filling factors. We use phonons to measure the activation gap Δ of the fractional quantum Hall states at constant fillings as a function of the perpendicular magnetic field B. At a given filling factor nearly all gaps measured show a square-root dependence on the magnetic field and can be described by one single fit parameter related to the composite fermion effective mass. In addition, we present transport experiments to deduce energy gaps. Here, an astonish linear dependence of Δ on B is observed for a number of fractional filling factors.
UR - http://www.scopus.com/inward/record.url?scp=55649123294&partnerID=8YFLogxK
U2 - 10.1002/pssb.200743405
DO - 10.1002/pssb.200743405
M3 - Review article
AN - SCOPUS:55649123294
VL - 245
SP - 409
EP - 420
JO - Physica Status Solidi (B) Basic Research
JF - Physica Status Solidi (B) Basic Research
SN - 0370-1972
IS - 2
ER -