Tunable Coupling of Two-Dimensional Superconductors in Bilayer SrTiO3 Heterostructures

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-dependences 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 inter-sub-band interactions.

5 pages, 5 figures, submitted for publication

References in corpus (6)

• Strong Coulomb drag and broken symmetry in double-layer graphene
• Evidence for a Spin Phase Transition at ν=0 in Bilayer Graphene
• Theory of the SrTiO3 Surface State Two-Dimensional Electron Gas
• Critical tunneling currents in the regime of bilayer excitons
• Two-band superconductivity in doped SrTiO${}_3$ films and interfaces
• Multiple-gap structure in electric-field-induced surface superconductivity

Cited by in corpus (3)

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• Extreme orbital ab-plane upper critical fields far beyond Pauli limit in 4Hb-Ta(S, Se)2 bulk crystals
• Tuning metal/superconductor to insulator/superconductor coupling via control of proximity enhancement between NbSe${}_2$ monolayers