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Metal-Semiconductor Junctions01:24

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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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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Field-effect transistors (FETs) are integral to electronic circuits and distinguished by their three-terminal setup: the gate, drain, and source. These transistors operate as unipolar devices, which utilize either electrons or holes as charge carriers, in contrast to bipolar transistors, which use both types of carriers. The primary function of the FET is to modulate the flow of these carriers from the source to the drain through a channel. The voltage difference between the gate and source...
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A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
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Superconducting Field-Effect Transistors with PdTe-Te Intimate Contacts.

Chang Niu1,2, Mingyi Wang3, Zhuocheng Zhang1,2

  • 1Elmore Family School of Electrical and Computer Engineering, Purdue University, West Lafayette, Indiana 47907, United States.

ACS Nano
|May 31, 2024
PubMed
Summary

Researchers developed a new method for high-quality superconductor-semiconductor interfaces using intimate contact. This advances superconducting electronic devices for quantum computing and other technologies.

Keywords:
Josephson-junctioncontact engineeringinterdiffusioninterfacesuperconductivitytellurium

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Quantum Computing

Background:

  • Superconducting electronic devices are crucial for quantum computing.
  • Superconductor-semiconductor interfaces limit the performance of Josephson-junction (JJ) devices.
  • High-quality interfaces are essential for controllable superconducting devices.

Purpose of the Study:

  • To present an alternative method for high-quality superconductor-semiconductor interfaces.
  • To investigate proximity-induced superconductivity in tellurium (Te).
  • To fabricate and characterize a novel superconducting device.

Main Methods:

  • Utilized intimate contact for superconductor-semiconductor interface formation.
  • Grew two-dimensional (2D) tellurium (Te) single crystals hydrothermally.
  • Partially converted 2D Te to superconducting palladium telluride (PdTe) via controlled annealing.
  • Fabricated a PdTe-Te-PdTe Josephson junction (JJ).

Main Results:

  • Achieved high-quality superconductor-semiconductor interfaces.
  • Demonstrated proximity-induced superconductivity in tellurium.
  • Fabricated a gate-tunable Josephson junction with ambipolar supercurrent.
  • Observed multiple Andreev reflections in the fabricated device.

Conclusions:

  • The intimate contact method provides a promising route to high-quality superconducting interfaces.
  • The developed PdTe-Te-PdTe JJ is a controllable superconducting device.
  • This work advances the development of superconducting electronics for quantum computing and interface-based technologies.