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Tunable Photoresponse in a Two-Dimensional Superconducting Heterostructure.

Zijie Ji1,2, Ruan Zhang1,2, Shuangxing Zhu1,2

  • 1National Key Laboratory of Science and Technology on Micro/Nano Fabrication, Shanghai Jiao Tong University, Shanghai 200240, China.

Nanomaterials (Basel, Switzerland)
|February 11, 2023
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Summary

We demonstrate tunable photoresponsivity in a two-dimensional niobium diselenide-graphene heterojunction by modulating the superconducting critical current with gate voltage. This opens new avenues for designing adaptable superconducting photodetectors.

Keywords:
gate modulationniobium diselenidesuperconducting photodetectorvan der Waals heterostructure

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Nanotechnology

Background:

  • Photo-induced superconducting transitions are vital for studying correlated electronic systems and broadband photodetection.
  • Conventional superconductors exhibit photoresponse insensitive to electrostatic doping due to high carrier density, limiting tunable optoelectronic device applications.

Purpose of the Study:

  • To demonstrate gate voltage modulation of photoresponsivity in a two-dimensional niobium diselenide-graphene heterojunction.
  • To explore the underlying mechanism of gate-controlled photoresponse.
  • To investigate the potential for tunable superconducting photodetectors.

Main Methods:

  • Fabrication of a two-dimensional niobium diselenide-graphene heterojunction.
  • Measurement of photoresponsivity under varying gate voltages.
  • Temperature and laser power-dependent characterization of photoresponse.
  • Spatially-resolved photocurrent mapping.

Main Results:

  • Gate voltage modulation of photoresponsivity was achieved in the NbSe2-graphene heterojunction.
  • The superconducting critical current was found to depend on gate-induced hot carrier generation in graphene via Joule heating.
  • Shifts in the magnitude and peak position of photoresponsivity spectra were observed with changing gate voltage.
  • Inhomogeneous superconductivity was detected across the junction area.

Conclusions:

  • The study presents a novel platform for developing tunable superconducting photodetectors.
  • Photoresponse can serve as a powerful tool for investigating local electronic properties and phase transitions in low-dimensional superconducting systems.
  • Gate-controlled hot carrier generation in graphene influences the superconducting properties of NbSe2.