Influence of electronic correlations on the frequency-dependent hopping transport in Si:P
| dc.creator | Ritz, Elvira | |
| dc.creator | Dressel, Martin | |
| dc.date | 2007-11-08 | |
| dc.date | 2008-03-03 | |
| dc.date.accessioned | 2026-07-07T09:23:59Z | |
| dc.date.available | 2026-07-07T09:23:59Z | |
| dc.description | At low energy scales charge transport in the insulating Si:P is dominated by activated hopping between the localized donor electron states. Thus, theoretical models for a disordered system with electron-electron interaction are appropriate to interpret the electric conductivity spectra. With a newly developed technique we have measured the complex broadband microwave conductivity of Si:P from 100 MHz to 5 GHz in a broad range of phosphorus concentration $n/n_c$ from 0.56 to 0.95 relative to the critical value $n_c=3.5\times 10^{18}$ cm$^{-3}$ corresponding to the metal-insulator transition driven by doping. At our base temperature of $T =1.1$ K the samples are in the zero-phonon regime where they show a super-linear frequency dependence of the conductivity indicating the influence of the Coulomb gap in the density of the impurity states. At higher doping $n\to n_c$, an abrupt drop in the conductivity power law $\sig(ω)\simω^α$ is observed. The dielectric function $\eps$ increases upon doping following a power law in ($1-n/n_c$). Dynamic response at elevated temperatures has also been investigated. | |
| dc.description | 5 pages, 7 figures, conference "Transport in Interacting Disordered Systems" Marburg, August 6 - 10, 2007 | |
| dc.identifier | https://arxiv.org/abs/0711.1256 | |
| dc.identifier | http://arxiv.org/abs/0711.1256 | |
| dc.identifier | Published in phys. stat. sol. (c) 5, No. 3, 703-707 (2008), http://www.interscience.wiley.com/ | |
| dc.identifier | doi:10.1002/pssc.200777583 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/155934 | |
| dc.subject | Disordered Systems and Neural Networks | |
| dc.subject | Strongly Correlated Electrons | |
| dc.title | Influence of electronic correlations on the frequency-dependent hopping transport in Si:P | |
| dc.type | text |