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Related Concept Videos

Magnetic Vector Potential01:15

Magnetic Vector Potential

In electrostatics, the electric field can be written as the negative gradient of the potential. In magnetostatics, the zero divergence of the magnetic field ensures that the magnetic field can be expressed as the curl of a vector potential. This potential is known as the magnetic vector potential.
Consider an ideal solenoid with n turns per unit length and radius R. If I is the current through the solenoid, the magnetic field inside the solenoid is expressed as the product of vacuum...
Electro-mechanical Systems01:19

Electro-mechanical Systems

Electromechanical systems are intricate configurations that effectively combine electrical and mechanical elements to achieve a desired outcome. Central to many of these systems is the DC motor, a device that converts electrical energy into mechanical motion, enabling various applications ranging from simple fans to complex robotic mechanisms.
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Torque On A Current Loop In A Magnetic Field

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Faraday Disk Dynamo01:23

Faraday Disk Dynamo

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Magnetic Damping01:17

Magnetic Damping

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Adiabatic Processes for an Ideal Gas01:18

Adiabatic Processes for an Ideal Gas

When an ideal gas is compressed adiabatically, that is, without adding heat, work is done on it, and its temperature increases. In an adiabatic expansion, the gas does work, and its temperature drops. Adiabatic compressions actually occur in the cylinders of a car, where the compressions of the gas-air mixture take place so quickly that there is no time for the mixture to exchange heat with its environment. Nevertheless, because work is done on the mixture during the compression, its...

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Related Experiment Video

Updated: May 8, 2026

Light-driven Molecular Motors on Surfaces for Single Molecular Imaging
08:40

Light-driven Molecular Motors on Surfaces for Single Molecular Imaging

Published on: March 13, 2019

Adiabatic quantum motors.

Raúl Bustos-Marún1, Gil Refael, Felix von Oppen

  • 1Dahlem Center for Complex Quantum Systems and Fachbereich Physik, Freie Universität Berlin, 14195 Berlin, Germany.

Physical Review Letters
|August 27, 2013
PubMed
Summary
This summary is machine-generated.

This study introduces adiabatic quantum motors that use transport current to drive periodic changes in a system. These quantum motors, based on chaotic quantum dots or Thouless pumps, show potential for efficient operation.

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Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
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Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving

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Last Updated: May 8, 2026

Light-driven Molecular Motors on Surfaces for Single Molecular Imaging
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Light-driven Molecular Motors on Surfaces for Single Molecular Imaging

Published on: March 13, 2019

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
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Published on: March 30, 2017

Area of Science:

  • Condensed Matter Physics
  • Quantum Mechanics
  • Nanotechnology

Background:

  • Periodic parameter variations in mesoscopic conductors can pump charge without bias.
  • Understanding the inverse effect, where current drives parameter variations, is key to new quantum devices.

Purpose of the Study:

  • To introduce and explain the operating principle of adiabatic quantum motors.
  • To analyze the relationship between work performed, quantum pump characteristics, and motor efficiency.

Main Methods:

  • Theoretical analysis of adiabatic quantum motors.
  • Investigation of quantum pumps based on chaotic quantum dots and Thouless pumps.

Main Results:

  • Demonstrated a general operating principle for adiabatic quantum motors driven by transport current.
  • Related motor work output to quantum pump properties and discussed efficiency metrics.

Conclusions:

  • Adiabatic quantum motors offer a novel approach to quantum transport.
  • Motors utilizing chaotic quantum dots leverage quantum interference, while Thouless pump-based motors achieve ideal efficiency.