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- Title
PHONON EXCITATIONS OF COMPOSITE FERMION LANDAU LEVELS.
- Authors
Schulze-Wischeler, F.; Hohls, F.; Zeitler, U.; Reuter, D.; Wieck, A. D.; Haug, R. J.
- Abstract
Energy gaps in the fractional quantum Hall regime are measured with phonon spectroscopy for various electron densities and filling factors v = ⅓, ⅖, &frac47;, ⅗, ⅔, &frac43;, and &frac53;. 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 v = ⅔ in the high fields regime show a linear field dependence. This hints onto an only partially polarized ground state of ⅔.
- Subjects
QUANTUM Hall effect; PHONONS; FERMIONS; LANDAU levels; EXCITON theory; MAGNETIC fields; BAND gaps; PHYSICS
- Publication
International Journal of Modern Physics B: Condensed Matter Physics; Statistical Physics; Applied Physics, 2004, Vol 18, Issue 27-29, p3857
- ISSN
0217-9792
- Publication type
Article
- DOI
10.1142/S0217979204027608