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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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Competition between electron pairing and phase coherence in superconducting interfaces.

G Singh1,2, A Jouan1,2, L Benfatto3,4

  • 1Laboratoire de Physique et d'Etude des Matériaux, ESPCI Paris, PSL Research University, CNRS, 10 Rue Vauquelin, 75005, Paris, France.

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|January 31, 2018
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This summary is machine-generated.

Superconductivity in LaAlO3/SrTiO3 heterostructures arises from a small fraction of electrons in high-energy bands, driven by a balance between electron pairing and phase coherence.

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Area of Science:

  • Oxide heterostructures
  • Condensed matter physics
  • Quantum phenomena

Background:

  • LaAlO3/SrTiO3 heterostructures host a tunable superconducting electron gas at the interface.
  • This system exhibits coexisting magnetism and strong Rashba spin-orbit coupling.
  • The origins of superconductivity and its normal state transition remain unclear.

Purpose of the Study:

  • Investigate the superconducting properties of LaAlO3/SrTiO3 interfaces.
  • Determine the factors controlling the superconducting phase diagram.
  • Elucidate the nature of electron condensation in this system.

Main Methods:

  • Resonant microwave transport measurements.
  • Extraction of superfluid stiffness and superconducting gap energy.
  • Carrier density dependent analysis.

Main Results:

  • Superconducting phase diagram is governed by competition between electron pairing and phase coherence.
  • Superfluid density analysis indicates a small fraction of electrons condense.
  • Superconductivity is linked to weak filling of high-energy d(xz)/d(yz) bands.

Conclusions:

  • The findings provide insight into the mechanism of superconductivity in oxide interfaces.
  • The study highlights the role of specific electronic bands in hosting superconductivity.
  • Understanding these properties is crucial for future oxide electronics.