| Автор | C J Mellor |
| Дата выпуска | 1999-10-11 |
| dc.description | The results of ballistic phonon and microwave absorption experiments are presented in the fractional quantum Hall regime of two-dimensional electron and hole systems respectively. Time-resolved ballistic phonon results suggest that acoustic phonons can be absorbed by the magnetoroton excitations of a fractional quantum Hall fluid. The technique allows the determination of the magnetoroton gap and holds out the promise of being able to measure the magnetoroton dispersion curve in angle-resolved experiments. At lower Landau level filling factors, high-mobility two-dimensional systems become insulating. Microwave absorption experiments at finite wavevector find a series of sharp absorption lines in the insulating phase that become more pronounced as the temperature is lowered and the magnetic field increased. The results strongly suggest that the two-dimensional system forms a pinned Wigner solid at these low filling factors. Further analysis allows the determination of the pinning frequency and its variation as a function of magnetic field. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Название | Finite-wavevector studies of two-dimensional systems |
| Тип | paper |
| DOI | 10.1088/0953-8984/11/40/305 |
| Electronic ISSN | 1361-648X |
| Print ISSN | 0953-8984 |
| Журнал | Journal of Physics: Condensed Matter |
| Том | 11 |
| Первая страница | 7723 |
| Последняя страница | 7736 |
| Аффилиация | C J Mellor; School of Physics and Astronomy, University of Nottingham, University Park, Nottingham NG7 2RD, UK |
| Выпуск | 40 |
