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Observation of collective excitations in the fractional quantum Hall effect

1993; American Physical Society; Volume: 70; Issue: 25 Linguagem: Inglês

10.1103/physrevlett.70.3983

1092-0145

A. Pinczuk, B. S. Dennis, L. N. Pfeiffer, K. W. West,

Semiconductor Quantum Structures and Devices

A long wavelength, low-energy excitation of the fractional quantum Hall state at \ensuremath{\nu}=1/3 has been observed by inelastic light scattering. The mode appears as a very sharp peak with marked temperature and magnetic field dependence. Its energy is consistent with theoretical predictions for the collective gap excitations of the incompressible quantum fluid. Spectra interpreted as q=0 collective spin-wave excitations also display the strong dependence on field and temperature associated with the fractional quantum Hall state.