Schulze-Wischeler F, Hohls F, Zeitler U, Reuter D, Wieck AD, Haug RJ. Phonon excitations of composite-fermion landau levels.
PHYSICAL REVIEW LETTERS 2004;
93:026801. [PMID:
15323936 DOI:
10.1103/physrevlett.93.026801]
[Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/02/2004] [Indexed: 05/24/2023]
Abstract
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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