Signature of Electronic Correlations in the Optical Conductivity of the Doped Semiconductor Si:P
| dc.creator | Hering, Marco | |
| dc.creator | Scheffler, Marc | |
| dc.creator | Dressel, Martin | |
| dc.creator | Lohneysen, Hilbert v. | |
| dc.date | 2006-09-27 | |
| dc.date | 2007-03-06 | |
| dc.date.accessioned | 2026-07-07T08:01:29Z | |
| dc.date.available | 2026-07-07T08:01:29Z | |
| dc.description | Electronic transport in highly doped but still insulating silicon at low temperatures is dominated by hopping between localized states; it serves as a model system of a disordered solid for which the electronic interaction can be investigated. We have studied the frequency-dependent conductivity of phosphorus-doped silicon in the THz frequency range (30 GHz to 3 THz) at low temperatures $T\geq 1.8$ K. The crossover in the optical conductivity from a linear to a quadratic frequency dependence as predicted by Efros and Shklovskii is observed qualitatively; however, the simple model does not lead to a quantitative agreement. Covering a large range of donor concentration, our temperature- and frequency-dependent investigations reveal that electronic correlation effects between the localized states play an important and complex role at low temperatures. In particular we find a super-linear frequency dependence of the conductivity that highlights the influence of the density of states, i.e. the Coulomb gap, on the optical conductivity. When approaching the metal-to-insulator transition by increasing doping concentration, the dielectric constant and the localization length exhibit critical behavior. | |
| dc.description | 9 pages, 8 figures, 1 table | |
| dc.identifier | https://arxiv.org/abs/cond-mat/0609716 | |
| dc.identifier | http://arxiv.org/abs/cond-mat/0609716 | |
| dc.identifier | Phys. Rev. B 75, 205203 (2007) | |
| dc.identifier | doi:10.1103/PhysRevB.75.205203 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/128928 | |
| dc.subject | Strongly Correlated Electrons | |
| dc.subject | Disordered Systems and Neural Networks | |
| dc.title | Signature of Electronic Correlations in the Optical Conductivity of the Doped Semiconductor Si:P | |
| dc.type | text |