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Hierarchy of quantum corrections to resistivity of a γ−Al2O3/SrTiO3 two-dimensional electron gas

Jiwon Yang1, Akira Endo1, Daisuke Shiga2,3, Hayato Konaka2, Tomoaki Tanaka1, Masayuki Hashisaka1, Hiroshi Kumigashira2,3, and Mikk Lippmaa1,*

  • *Contact author: mlippmaa@issp.u-tokyo.ac.jp
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Phys. Rev. B 114, 115419 – Published 27 August, 2026

DOI: https://doi.org/10.1103/6xfk-zwrl

Abstract

A resistance upturn that occurs in SrTiO3-based two-dimensional electron gases at low temperatures is often attributed to Kondo scattering of carriers from localized spins. We show that the low-temperature transport behavior of the electron gas that forms at the γ−Al2O3/SrTiO3 interface is governed by a whole hierarchy of quantum corrections in addition to the Kondo contribution. Upon cooling, the resistance shows a typical Kondo-like upturn, but then decreases due to weak antilocalization, and finally vanishes at the superconducting transition. When superconductivity is suppressed by applying a magnetic field or by reducing the carrier density, a logarithmic correction due to electron-electron interactions appears at millikelvin temperatures. These results show that the low-temperature resistance behavior cannot be accounted for by a Kondo-only interpretation, but requires consideration of several quantum corrections.

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Phys. Rev. B 114, 115419– Published 27 August, 2026
  • Received 23 April 2026
  • Revised 5 August 2026
  • Accepted 7 August 2026
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