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Interfacial Electrochemical Methods: Overview01:06

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Fabrication and Characterization of Superconducting Resonators
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Gate-Induced Interfacial Superconductivity in 1T-SnSe2.

Junwen Zeng1, Erfu Liu1, Yajun Fu1,2

  • 1National Laboratory of Solid State Microstructures, School of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University , Nanjing 210093, China.

Nano Letters
|February 2, 2018
PubMed
Summary

We discovered gate-induced two-dimensional (2D) superconductivity in 1T-SnSe2 using an electric-double-layer transistor. This finding expands the materials for exploring interfacial superconductivity and new physics like the Ising pairing mechanism.

Keywords:
SnSe2electric-double-layer transistorinterfacial superconductivitymetal dichalcogenides

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Superconductivity

Background:

  • Layered metal chalcogenides are crucial for studying emergent phenomena and two-dimensional (2D) superconductivity.
  • Gate-induced interfacial superconductivity, particularly via electric-double-layer transistors (EDLTs), enables electrical induction of superconductivity in diverse materials.
  • This technique allows exploration of novel physics, including the Ising pairing mechanism.

Purpose of the Study:

  • To report the discovery of gate-induced 2D superconductivity in layered 1T-SnSe2.
  • To characterize the superconducting properties and confirm its 2D nature.
  • To expand the material platform for studying interfacial superconductivity.

Main Methods:

  • Utilized an EDLT gating geometry to induce superconductivity in 1T-SnSe2.
  • Measured superconducting transition temperature (Tc ≈ 3.9 K) at the EDL interface.
  • Confirmed 2D superconductivity through angle-dependent upper critical field (Bc2) analysis (2D Tinkham description) and quantum creep studies.

Main Results:

  • Demonstrated gate-induced 2D superconductivity in layered 1T-SnSe2 with Tc ≈ 3.9 K.
  • Confirmed the 2D nature of superconductivity via critical field analysis and quantum creep.
  • Observed in-plane Bc2 exceeding the Pauli limit by 2-3 times, potentially due to electric field-modulated spin-orbit interaction.

Conclusions:

  • 1T-SnSe2 serves as a new material for realizing gate-induced 2D superconductivity.
  • The findings offer insights into emergent interfacial superconductivity and novel phenomena.
  • The enhanced critical field suggests a role for spin-orbit interactions in this system.