Phonon Excitations of Composite Fermion Landau Levels

Details Phonon Excitations of Composite Fermion Landau Levels Phonon Excitations of Composite Fermion Landau Levels

2004-03-02

arxiv.org/abs/cond-mat/0403072v2

Phys. Rev. Lett 93, 026801 (2004)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures, 1 table, accepted for Phys. Rev. Lett

Scientific paper

10.1142/S0217979204027608

Phonon excitations of fractional quantum Hall states at filling factors nu = 1/3, 2/5, 4/7, 3/5, 4/3, and 5/3 are experimentally shown to be based on Landau level transitions of Composite Fermions. At filling factor nu = 2/3, however, a linear field dependence of the excitation energy in the high-field regime rather hints towards a spin transition excited by the phonons. We propose to explain this surprising observation by an only partially polarized 2/3-ground-state making the energetically lower lying spin transition also allowed for phonon excitations.

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