Fermi Surface and Superconductivity in Low-Density High-Mobility delta-Doped SrTiO3

M. Kim*, C. Bell, Y. Kozuka, M. Kurita, Y. Hikita, H. Y. Hwang, Chris Bell

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)

37 Citations (Scopus)

Abstract

The electronic structure of low-density n-type SrTiO3 delta-doped heterostructures is investigated by angular dependent Shubnikov-de Haas oscillations. In addition to a controllable crossover from a three-to two-dimensional Fermi surface, clear beating patterns for decreasing dopant layer thicknesses are found. These indicate the lifting of the degeneracy of the conduction band due to subband quantization in the two-dimensional limit. Analysis of the temperature-dependent oscillations shows that similar effective masses are found for all components, associated with the splitting of the light electron pocket. The dimensionality crossover in the superconducting state is found to be distinct from the normal state, resulting in a rich phase diagram as a function of dopant layer thickness.

Original languageEnglish
Article number106801
Number of pages4
JournalPhysical Review Letters
Volume107
Issue number10
DOIs
Publication statusPublished - 30 Aug 2011

Keywords

  • 2-DIMENSIONAL ELECTRON-GAS
  • FIELD
  • TRANSITIONS
  • INTERFACES
  • INSULATOR
  • PHASE

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