Band spectra of periodic hybrid δ- δ′ structures
We present a detailed study of a generalised one-dimensional Kronig–Penney model using δ- δ′ potentials. We analyse the band structure and the density of states in two situations. In the first case, we consider an infinite array formed by identical δ- δ′ potentials standing at the linear lattice nod...
| Autores: | , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión aceptada para publicación |
| Fecha de publicación: | 2020 |
| País: | España |
| Institución: | Universidad de Burgos (UBU) |
| Repositorio: | Repositorio Institucional de la Universidad de Burgos (RIUBU) |
| OAI Identifier: | oai:riubu.ubu.es:10259/10004 |
| Acceso en línea: | http://hdl.handle.net/10259/10004 |
| Access Level: | acceso abierto |
| Palabra clave: | Física Matemáticas Physics Mathematics |
| Sumario: | We present a detailed study of a generalised one-dimensional Kronig–Penney model using δ- δ′ potentials. We analyse the band structure and the density of states in two situations. In the first case, we consider an infinite array formed by identical δ- δ′ potentials standing at the linear lattice nodes. This case will be known throughout the paper as the one-species hybrid Dirac comb. We investigate the consequences of adding the δ′ interaction to the Dirac comb by comparing the band spectra and the density of states of pure Dirac-δ combs and one-species hybrid Dirac combs. Secondly, we study the quantum system that arises when the periodic potential is the one obtained from the superposition of two one-species hybrid Dirac combs displaced one with respect to the other and with different couplings. The latter will be known as the two-species hybrid Dirac comb. One of the most remarkable results is the appearance of a curvature change in the band spectrum when the δ′ couplings are above a critical value. |
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