Renormalization of the 3D exciton spectrum by the disorder
| Autor: | R. E. Putnam, Mikhail Raikh |
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| Rok vydání: | 2021 |
| Předmět: |
Physics
Condensed matter physics Exciton Spectrum (functional analysis) FOS: Physical sciences Disordered Systems and Neural Networks (cond-mat.dis-nn) General Chemistry Condensed Matter - Disordered Systems and Neural Networks Condensed Matter Physics Bohr model Lamb shift Renormalization symbols.namesake Excited state Materials Chemistry symbols Degeneracy (mathematics) Bohr radius |
| Zdroj: | Solid State Communications. 340:114522 |
| ISSN: | 0038-1098 |
| DOI: | 10.1016/j.ssc.2021.114522 |
| Popis: | Effect of short-range disorder on the excited states of the exciton is studied. Disorder causes an obvious effect of broadening. Microscopically, an exciton, as an entity, is scattered by the large-scale disorder fluctuations. Much less trivial is that short-scale fluctuations, with a period of the order of the Bohr radius, cause a well-defined down-shift of the exciton levels. We demonstrate that this shift exceeds the broadening parametrically and study the dependence of this shift on the orbital number. Difference of the shifts for neighboring levels leads to effective renormalization of the Bohr energy. Most remarkable effect is the disorder-induced splitting of S and P exciton levels. The splitting originates from the fact that disorder lifts the accidental degeneracy of the hydrogen-like levels. The draw an analogy between this splitting and the Lamb shift in quantum electrodynamics. Comment: 6 pages 1 figure |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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