| Автор | Ganpathy Murthy |
| Дата выпуска | 2000-12-18 |
| dc.description | Using the Hamiltonian formulation for composite fermions developed recently, the temperature dependence of the spin polarization is computed for the translationally invariant fractional quantum Hall states at ν = 1/3 and ν = 2/5 in two steps. In the first step, the effect of particle-hole excitations on the spin polarization is computed in a composite-fermion Hartree-Fock approximation. The computed magnetization for ν = 1/3 lies above the experimental results for intermediate temperatures indicating the importance of long-wavelength spin fluctuations which are not correctly treated in the Hartree-Fock approximation. In the second step, spin fluctuations beyond the Hartree-Fock approximation are included for ν = 1/3 by mapping the problem onto the coarse-grained continuum quantum ferromagnet. The parameters of the description in terms of the effective continuum quantum ferromagnet are extracted from the preceding Hartree-Fock analysis. After the inclusion of spin fluctuations in a large-N approach, the results for the finite-temperature spin polarization are in quite good agreement with the experiments. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Название | Finite-temperature magnetism in fractional quantum Hall systems: the composite-fermion Hartree-Fock approximation and beyond |
| Тип | paper |
| DOI | 10.1088/0953-8984/12/50/315 |
| Electronic ISSN | 1361-648X |
| Print ISSN | 0953-8984 |
| Журнал | Journal of Physics: Condensed Matter |
| Том | 12 |
| Первая страница | 10543 |
| Последняя страница | 10560 |
| Аффилиация | Ganpathy Murthy; Department of Physics and Astronomy, University of Kentucky, Lexington, KY 40506, USA |
| Выпуск | 50 |
