Phonon excitations of composite-fermion landau levels |
| |
Authors: | Schulze-Wischeler F Hohls F Zeitler U Reuter D Wieck A D Haug R J |
| |
Institution: | Institut für Festk?rperphysik, Universit?t Hannover, Appelstrasse 2, 30167 Hannover, Germany. |
| |
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. |
| |
Keywords: | |
本文献已被 PubMed 等数据库收录! |
|