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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:
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The Reynolds transport theorem provides a framework to relate the time rate of change of an extensive property within a system to that in a control volume, which is crucial for analyzing fluid dynamics. Extensive properties, such as mass, velocity, acceleration, temperature, and momentum, can be expressed in terms of the mass of a fluid portion. These properties are called extensive because they depend on the system's size, while intensive properties are their corresponding values per unit...
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Controlled current coulometry, also known as amperostatic coulometry, is a technique used in electrochemical analysis to measure the quantity of a substance through the controlled passage of current. It involves the application of a constant current to an electrochemical cell containing the analyte of interest. As the current flows through the cell, the analyte undergoes a redox reaction at the electrode surface, resulting in a charge transfer. By monitoring the time required for a certain...
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Controlling Quantum Transport via Dissipation Engineering.

François Damanet1, Eduardo Mascarenhas1, David Pekker2,3

  • 1Department of Physics and SUPA, University of Strathclyde, Glasgow G4 0NG, United Kingdom.

Physical Review Letters
|November 26, 2019
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Summary
This summary is machine-generated.

We developed a new framework to control transport in fermionic systems using dissipation. This allows engineering of superconducting and superfluid systems, enabling control over electron and Cooper-pair currents.

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Area of Science:

  • Quantum physics
  • Condensed matter physics
  • Atomic physics

Background:

  • Dissipative processes are crucial in quantum optics and cold atom systems.
  • Controlling transport in strongly interacting fermionic systems is relevant for solid-state and cold-atom experiments.

Purpose of the Study:

  • To develop an open-system framework for studying dissipative control of transport in fermionic systems.
  • To demonstrate control over subgap currents exhibiting multiple Andreev reflections.

Main Methods:

  • Developed an open-system framework incorporating dissipation.
  • Studied control via engineering of superconducting leads or superfluid atomic gases.
  • Incorporated naturally occurring and engineerable dissipation within the transport channel.

Main Results:

  • Showed how subgap currents with multiple Andreev reflections can be controlled.
  • Demonstrated control by engineering superconducting leads or superfluid atomic gases.
  • Observed different behaviors for currents of different microscopic origins, including particle loss and dephasing.
  • Induced nonreciprocal electron and Cooper-pair currents.

Conclusions:

  • The developed framework enables engineering of transport phenomena in strongly interacting systems.
  • Dissipative control offers new opportunities for manipulating quantum transport.
  • The approach is applicable to both solid-state and cold-atom experimental platforms.