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Related Concept Videos

Superconductor01:24

Superconductor

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A substance that reaches superconductivity, a state in which magnetic fields cannot penetrate, and there is no electrical resistance, is referred to as a superconductor. In 1911, Heike Kamerlingh Onnes of Leiden University, a Dutch physicist, observed a relation between the temperature and the resistance of the element mercury. The mercury sample was then cooled in liquid helium to study the linear dependence of resistance on temperature. It was observed that, as the temperature decreased, the...
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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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Metal-Semiconductor Junctions

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The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
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Engineering Superconducting Contacts Transparent to a Bipolar Graphene.

Seong Jang1, Geon-Hyoung Park1, Sein Park1

  • 1Department of Physics, Pohang University of Science and Technology, Pohang 37673, Republic of Korea.

Nano Letters
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Summary

Researchers developed a new fabrication method for superconducting contacts in graphene, enabling independent control over doping and polarity. This overcomes previous limitations, paving the way for advanced graphene-superconductor devices and exploring the proximity effect.

Keywords:
Josephson junctionbipolaritygraphenesuperconducting proximity effecttransparency

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Graphene's unique electronic properties are ideal for studying the superconducting proximity effect.
  • Work function mismatches between graphene and superconductors lead to doping and p-n junctions, hindering device performance.
  • Existing methods struggle to independently control graphene's charge concentration and polarity at superconducting contacts.

Purpose of the Study:

  • To overcome limitations in graphene-superconductor interfaces caused by doping.
  • To develop a fabrication scheme for transparent two-dimensional superconducting contacts.
  • To enable independent control over charge concentration and polarity in graphene.

Main Methods:

  • Fabrication of novel two-dimensional superconducting contacts for graphene.
  • Independent control of charge carrier density and polarity in graphene.
  • Measurement of contact transparency, conductance enhancement, and Josephson coupling.

Main Results:

  • Achieved transparent superconducting contacts with both electron and hole doping in graphene.
  • Demonstrated independent control over graphene's charge concentration and polarity.
  • Successfully observed the Andreev process in a quantum Hall edge state.

Conclusions:

  • The new fabrication scheme effectively addresses doping issues in graphene-superconductor interfaces.
  • This method facilitates the realization of devices exploiting graphene's bipolarity and superconductivity.
  • Opens new possibilities for exploring fundamental physics and novel device applications.