Anomalous conductivity, Hall factor, magnetoresistance, and thermopower of accumulation layer in SrTiO3

Han Fu, K. V. Reich, B. I. Shklovskii

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4 Scopus citations

Abstract

We study the low temperature conductivity of the electron accumulation layer induced by the very strong electric field at the surface of an SrTiO3 sample. Due to the strongly nonlinear lattice dielectric response, the three-dimensional density of electrons n(x) in such a layer decays with the distance from the surface x very slowly as n(x) 1/x12/7. We show that when the mobility is limited by the surface scattering the contribution of such a tail to the conductivity diverges at large x because of growing time electrons need to reach the surface. We explore truncation of this divergence by the finite sample width, by the bulk scattering rate, by the back gate voltage, or by the crossover to the bulk linear dielectric response with the dielectric constant κ. As a result we arrive at the anomalously large mobility, which depends not only on the rate of the surface scattering, but also on the physics of truncation. Similar anomalous behavior is found for the Hall factor, the magnetoresistance, and the thermopower.

Original languageEnglish (US)
Article number045310
JournalPhysical Review B
Volume94
Issue number4
DOIs
StatePublished - Jul 19 2016

Bibliographical note

Funding Information:
This work was supported primarily by the National Science Foundation through the University of Minnesota MRSEC under Award No. DMR-1420013.

Publisher Copyright:
© 2016 American Physical Society.

How much support was provided by MRSEC?

  • Primary

Reporting period for MRSEC

  • Period 3

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