Tunable coupling of two-dimensional superconductors in bilayer SrTiO3 heterostructures

Hisashi Inoue*, Minu Kim, Christopher Bell, Yasuyuki Hikita, Srinivas Raghu, Harold Y. Hwang, Chris Bell

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

5 Citations (Scopus)

Abstract

Interlayer coupling effects between high mobility two-dimensional superconductors are studied in bilayer delta-doped SrTiO3 heterostructures. By tuning the undoped SrTiO3 spacer layer between the dopant planes, clear tunable coupling is demonstrated in the variation of the sheet carrier density, Hall mobility, superconducting transition temperature, and the temperature and angle dependencies of the superconducting upper critical field. Systematic variation is found between one effective (merged) two-dimensional superconductor to two decoupled two-dimensional superconductors. In the intermediate coupled regime, a crossover is observed due to coupling arising from intersubband interactions.

Original languageEnglish
Article number241104
Number of pages5
JournalPhysical Review B: Condensed Matter and Materials Physics
Volume88
Issue number24
DOIs
Publication statusPublished - 5 Dec 2013

Keywords

  • UPPER CRITICAL-FIELD
  • ELECTRON-SYSTEMS
  • GRAPHENE
  • SUPERLATTICES
  • SURFACE
  • STATE
  • GAS

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