Influence of electronic correlations on the frequency-dependent hopping transport in Si:P

Details Influence of electronic correlations on the frequency-dependent hopping transport in Si:P Influence of electronic correlations on the frequency-dependent hopping transport in Si:P

2007-11-08

arxiv.org/abs/0711.1256v2

Published in phys. stat. sol. (c) 5, No. 3, 703-707 (2008), http://www.interscience.wiley.com/

Physics

Condensed Matter

Disordered Systems and Neural Networks

5 pages, 7 figures, conference "Transport in Interacting Disordered Systems" Marburg, August 6 - 10, 2007

Scientific paper

10.1002/pssc.200777583

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 $\sig(\omega)\sim\omega^\alpha$ 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.

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