Charged particle transport in antidot lattices in the presence of magnetic and electric fields: Langevin approach
Magnetotransport experiments on antidot lattices show a rich variety of physical phenomena. Depending on the value of the particle mean-free path l in relation to the period λ of regular scatterers, two very different regimes can be distinguished: the strongly diffusive ( l ⪡ λ ) and the weakly diff...
| Autores: | , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2008 |
| País: | España |
| Institución: | Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya) |
| Repositorio: | Recercat. Dipósit de la Recerca de Catalunya |
| OAI Identifier: | oai:recercat.cat:2445/10589 |
| Acceso en línea: | https://hdl.handle.net/2445/10589 |
| Access Level: | acceso abierto |
| Palabra clave: | Processos estocàstics Moviment brownià Fluctuacions (Física) Fenòmens mesoscòpics (Física) Partícules (Física nuclear) Stochastic processes Brownian movements Fluctuations (Physics) Mesoscopic phenomena (Physics) Particles (Nuclear physics) |
| Sumario: | Magnetotransport experiments on antidot lattices show a rich variety of physical phenomena. Depending on the value of the particle mean-free path l in relation to the period λ of regular scatterers, two very different regimes can be distinguished: the strongly diffusive ( l ⪡ λ ) and the weakly diffusive ( l ≳ λ ) . We study particle transport in two-dimensional periodic landscapes based on a classical Langevin equation. The model covers both regimes and exhibits many of the features found experimentally at low magnetic fields. The most interesting observation is the presence of anomalous peaks in the magnetoresistance as a function of the magnetic field in the weakly diffusive regime. The roles of finite temperatures and of the electric field are also discussed. |
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