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Related Concept Videos

Carrier Transport01:21

Carrier Transport

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The generation of electrical current in semiconductors is fundamentally driven by two mechanisms: drift and diffusion. These processes are essential for the functionality and performance of semiconductor-based devices.
Drift Current:
The drift of charge carriers is started by an external electric field (E). Charged particles, such as electrons and holes, experience an acceleration between collisions with lattice atoms. For electrons, this results in a drift velocity (vd) given by:
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Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
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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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The Joule-Thomson effect, also known as the Joule-Kelvin effect, describes the temperature change of a fluid when it is forced through a valve or porous plug while keeping it in a thermally insulated environment. This experiment is called a throttling process. This is an important effect widely used in refrigeration and the liquefaction of gases.
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Theory of Metallic Conduction01:17

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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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Quantized thermal transport in single-atom junctions.

Longji Cui1, Wonho Jeong1, Sunghoon Hur1

  • 1Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI 48109, USA.

Science (New York, N.Y.)
|February 18, 2017
PubMed
Summary
This summary is machine-generated.

Researchers measured the thermal conductance of single-atom junctions in gold and platinum wires. They found thermal conductance is quantized at room temperature, confirming quantum thermal transport principles.

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Area of Science:

  • Condensed matter physics
  • Quantum mechanics
  • Nanotechnology

Background:

  • Understanding thermal transport at the atomic scale is crucial for exploring quantum phenomena.
  • Previous studies lacked the resolution to probe thermal conductance in individual atomic contacts.

Purpose of the Study:

  • To experimentally measure the thermal conductance of single-atom junctions in metallic wires.
  • To investigate quantum effects in thermal transport at the atomic scale.
  • To validate the Wiedemann-Franz law in atomic contacts.

Main Methods:

  • Utilized novel picowatt-resolution calorimetric scanning probes for precise measurements.
  • Fabricated custom equipment to achieve single-atom junction resolution.
  • Measured thermal conductance in gold and platinum atomic junctions.

Main Results:

  • Demonstrated quantized thermal conductance in gold single-atom junctions at room temperature.
  • Confirmed the validity of the Wiedemann-Franz law even at the single-atom contact level.
  • Quantitatively explained experimental findings using the Landauer framework for quantum thermal transport.

Conclusions:

  • Experimental techniques enable detailed studies of quantum thermal transport in atomic and molecular systems.
  • Findings provide a foundation for investigating fundamental, previously inaccessible issues in nanoscale thermal transport.
  • The study opens new avenues for exploring quantum effects in materials at the atomic level.