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Types Of Superconductors01:28

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A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the only interesting phenomenon as materials reach their transition temperatures. A second effect is the exclusion of magnetic fields. This is known as the Meissner effect. A light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor. High-speed trains that levitate on strong...
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Polarity-Switchable Sensitive Photodetection in a Superconducting van der Waals Heterostructure.

Shuangxing Zhu1,2, Hao Liu3, Jiaxin Wu1,2

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Summary

This study presents a novel superconducting photodetector with switchable positive and negative photoresponses. The device utilizes a NbSe2-WTe2-NbSe2 heterostructure for sensitive, tunable detection across visible to near-infrared light.

Keywords:
Andreev reflectionnegative photoconductivitypolarity-tunable photodetectionpositive photoconductivitysuperconducting photodetectors

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Optoelectronics

Background:

  • Switchable photoconductivity is crucial for advanced optical applications like logic gates and quantum computing.
  • Existing polarity-tunable photodetectors often suffer from low responsivity and limited spectral range.
  • Developing highly sensitive and spectrally broad photodetectors with tunable photoresponse is essential for efficient information processing.

Purpose of the Study:

  • To introduce a novel superconducting photodetector based on a van der Waals heterostructure.
  • To investigate the switchable positive and negative photoconductivity in this device.
  • To explore the underlying physical mechanisms and potential applications in optoelectronics.

Main Methods:

  • Fabrication of a NbSe2-WTe2-NbSe2 van der Waals heterostructure.
  • Characterization of the photodetector's response under varying bias voltages, light power, and temperature.
  • Analysis of photocurrent signals to determine responsivity and spectral range.

Main Results:

  • The NbSe2-WTe2-NbSe2 photodetector exhibits switchable photoresponse across the visible to near-infrared spectrum.
  • A negative photoresponse is observed at high bias voltages due to photoinduced superconducting phase transition.
  • A positive photoresponse is detected at low bias voltages, linked to light-modulated Andreev reflection.
  • Both positive (0.35 A/W) and negative (-5 A/W) photoresponsivity exceed 0.3 A/W.
  • Photoconductivity polarity is tunable via bias voltage, light power, and temperature.

Conclusions:

  • The developed superconducting photodetector offers high sensitivity and tunable photoresponse.
  • Quantum effects at the superconducting interface play a significant role in the observed phenomena.
  • This research paves the way for advanced optoelectronic devices in information processing and quantum technologies.