Magnetic character of the two-dimensional electron gas
The energies of the paramagnetic and ferromagnetic states of the two-dimensional electron gas are evaluated and compared in order to determine the magnetic character of the ground state. The calculations are made with the self-consistent Hartree-Fock approximation and the deformable jellium model. S...
| Autores: | , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2001 |
| País: | México |
| Institución: | Universidad Nacional Autónoma de México |
| Repositorio: | Sistema de Información de la Facultad de Ciencias, UNAM |
| OAI Identifier: | oai:repositorio.fciencias.unam.mx:11154/1978 |
| Acceso en línea: | http://hdl.handle.net/11154/1978 |
| Access Level: | acceso abierto |
| Palabra clave: | Physics, Condensed Matter electron-electron interaction electronic states (localized) phase transitions |
| Sumario: | The energies of the paramagnetic and ferromagnetic states of the two-dimensional electron gas are evaluated and compared in order to determine the magnetic character of the ground state. The calculations are made with the self-consistent Hartree-Fock approximation and the deformable jellium model. Several transition points between different magnetic phases are obtained. At very high densities of r(s) approximate to 2 a first transition is obtained from a paramagnetic fluid to a ferromagnetic one. At r(st1) approximate to 4.8 a symmetry and magnetic transition is obtained from a ferromagnetic fluid to a paramagnetic localized state with a periodic density centered on a hexagonal lattice. A ferromagnetic localized state is predicted at lower densities. The results are compared with those reported for the system with square symmetry. (C) 2001 Elsevier Science Ltd. All rights reserved. |
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