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Readout of Quantum Screening Effects Using a Time-Dependent Probe.

Nastaran Dashti1, Matteo Acciai1, Sara Kheradsoud2

  • 1Department of Microtechnology and Nanoscience (MC2), Chalmers University of Technology, S-412 96 Göteborg, Sweden.

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|December 24, 2021
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Summary
This summary is machine-generated.

Quantum screening effects in conductors can be detected using an additional AC-driven terminal. This method allows for direct readout of these effects, which can be controlled by the AC driving signal.

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Area of Science:

  • Condensed matter physics
  • Quantum transport phenomena

Background:

  • Quantum screening effects arise in coherent conductors with energy-dependent transmission under static voltage and temperature biases.
  • These effects influence the thermoelectric response coefficients.

Purpose of the Study:

  • To introduce and explore a novel method for directly probing quantum screening effects in conductors.
  • To investigate the impact of an AC-driven terminal on the thermoelectric response.

Main Methods:

  • Theoretical analysis of charge screening in biased conductors.
  • Inclusion of a frequency-dependent AC driving force on an additional terminal.
  • Calculation of linear thermoelectric response coefficients under AC driving.

Main Results:

  • An additional AC-driven terminal acts as a probe for quantum screening effects.
  • Static bias-induced charge screening nonlinearly impacts thermoelectric response coefficients when AC driving is considered.
  • These screening effects are controllable via the AC driving frequency.

Conclusions:

  • The proposed AC-driven terminal method offers a direct and controllable way to observe quantum screening effects.
  • The findings are relevant for understanding quantum transport in mesoscopic systems under realistic experimental conditions.
  • This technique provides a new tool for investigating charge screening phenomena in electronic devices.