Details
| Original language | English |
|---|---|
| Pages (from-to) | 3857-3864 |
| Number of pages | 8 |
| Journal | International Journal of Modern Physics B |
| Volume | 18 |
| Issue number | 27-29 |
| Publication status | Published - 30 Nov 2004 |
Abstract
Energy gaps in the fractional quantum Hall regime are measured with phonon spectroscopy for various electron densities and filling factors ν = 1/3, 2/5, 4/7, 3/5, 2/3, 4/3, and 5/3. At a given filling factor nearly all gaps measured show a square-root dependence on the magnetic field. The measured gaps can be described well with composite fermion theory: They are transitions between composite fermion Landau levels that are not affected by disorder on phonon wavelength. All transitions can be described by one single fit parameter related to the composite fermion effective mass. In contrast, the gaps at filling factor ν = 2/3 in the high fields regime show a linear field dependence. This hints onto an only partially polarized ground state of 2/3.
Keywords
- Collective excitations, Quantum Hall effects, Scattering by phonons
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Statistical and Nonlinear Physics
- Physics and Astronomy(all)
- Condensed Matter Physics
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In: International Journal of Modern Physics B, Vol. 18, No. 27-29, 30.11.2004, p. 3857-3864.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Phonon excitations of composite fermion Landau levels
AU - Schulze-Wischeler, F.
AU - Hohls, F.
AU - Zeitler, U.
AU - Reuter, D.
AU - Wieck, A. D.
AU - Haug, R. J.
N1 - Funding information: The authors thank E. support by BMBF and
PY - 2004/11/30
Y1 - 2004/11/30
N2 - Energy gaps in the fractional quantum Hall regime are measured with phonon spectroscopy for various electron densities and filling factors ν = 1/3, 2/5, 4/7, 3/5, 2/3, 4/3, and 5/3. At a given filling factor nearly all gaps measured show a square-root dependence on the magnetic field. The measured gaps can be described well with composite fermion theory: They are transitions between composite fermion Landau levels that are not affected by disorder on phonon wavelength. All transitions can be described by one single fit parameter related to the composite fermion effective mass. In contrast, the gaps at filling factor ν = 2/3 in the high fields regime show a linear field dependence. This hints onto an only partially polarized ground state of 2/3.
AB - Energy gaps in the fractional quantum Hall regime are measured with phonon spectroscopy for various electron densities and filling factors ν = 1/3, 2/5, 4/7, 3/5, 2/3, 4/3, and 5/3. At a given filling factor nearly all gaps measured show a square-root dependence on the magnetic field. The measured gaps can be described well with composite fermion theory: They are transitions between composite fermion Landau levels that are not affected by disorder on phonon wavelength. All transitions can be described by one single fit parameter related to the composite fermion effective mass. In contrast, the gaps at filling factor ν = 2/3 in the high fields regime show a linear field dependence. This hints onto an only partially polarized ground state of 2/3.
KW - Collective excitations
KW - Quantum Hall effects
KW - Scattering by phonons
UR - http://www.scopus.com/inward/record.url?scp=17644414965&partnerID=8YFLogxK
U2 - 10.1142/S0217979204027608
DO - 10.1142/S0217979204027608
M3 - Article
AN - SCOPUS:17644414965
VL - 18
SP - 3857
EP - 3864
JO - International Journal of Modern Physics B
JF - International Journal of Modern Physics B
SN - 0217-9792
IS - 27-29
ER -