Wigner-Mott Scaling of Transport near the Two-dimensional Metal-insulator Transition

Radonjic, Milos M and Tanaskovic, Darko and Dobrosavljevic, V and Haule, K and Kotliar, G (2012) Wigner-Mott Scaling of Transport near the Two-dimensional Metal-insulator Transition. Physical Review B, 85 (8). 085133. ISSN 1098-0121 (FP7- 261323)

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Abstract

Electron-electron scattering usually dominates the transport in strongly correlated materials. It typically leads to pronounced resistivity maxima in the incoherent regime around the coherence temperature T �, reflecting the tendency of carriers to undergo Mott localization following the demise of the Fermi liquid. This behavior is best pronounced in the vicinity of interaction-driven (Mott-like) metal-insulator transitions, where the T � decreases, while the resistivity maximum �max increases. Here we show that, in this regime, the entire family of resistivity curves displays a characteristic scaling behavior �(T )/�max � F(T/Tmax), while the �max and Tmax � T � assume a powerlaw dependence on the quasi-particle effective mass m�. Remarkably, precisely such trends are found from an appropriate scaling analysis of experimental data obtained from diluted two-dimensional electron gases in zero magnetic fields. Our analysis provides strong evidence that inelastic electron-electron scattering – and not disorder effects – dominates finite temperature transport in these systems, validating the Wigner-Mott picture of the two-dimensional metal-insulator transition.

Keywords

Item Type:	Article
FP7 Grant Agreement Number:	261323
FrameWork Programmes:	SP4-Capacities
Scientific Areas:	Research Infrastructures
Last Modified:	02 Aug 2012 08:07
Access rights:	Open access
URI:	http://eprints.kobson.nb.rs/id/eprint/5

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