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Related Concept Videos

Carrier Transport01:21

Carrier Transport

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.
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Theories of Dissolution: The Danckwerts' Model and Interfacial Barrier Model

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Reynolds Transport Theorem01:24

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Transport Number01:31

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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
05:39

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

Published on: August 2, 2019

Dissipative time-dependent quantum transport theory.

Yu Zhang1, Chi Yung Yam, GuanHua Chen

  • 1Department of Chemistry, The University of Hong Kong, Hong Kong.

The Journal of Chemical Physics
|May 3, 2013
PubMed
Summary
This summary is machine-generated.

A new quantum transport theory accounts for electron-phonon interactions in nanoscale devices. This method accurately models transient currents, revealing the crucial role of these interactions in quantum transport.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Mechanics
  • Materials Science

Background:

  • Understanding quantum transport in nanoscale devices is crucial for developing new electronic components.
  • Electron-phonon interactions significantly influence charge transport properties, but are challenging to model accurately in time-dependent scenarios.

Purpose of the Study:

  • To develop a dissipative time-dependent quantum transport theory.
  • To incorporate electron-phonon interactions into the theoretical framework for transient current calculations.
  • To provide an efficient and accurate numerical method for studying these effects.

Main Methods:

  • Developed a quantum transport theory incorporating electron-phonon self-energy alongside electrode self-energy.
  • Proposed a numerical method using lowest order expansion for weak coupling and wide-band limit approximation.
  • Derived hierarchical equations of motion for time-dependent treatment of inelastic effects.

Main Results:

  • The method accurately captures the time-dependent quantum transport influenced by electron-phonon interactions.
  • Demonstrated the importance of electron-phonon coupling in a one-level model and a gold wire system.
  • The developed theory shows validity and highlights the impact of inelastic effects on transport.

Conclusions:

  • The proposed theory and numerical method offer an efficient way to study time-dependent quantum transport with electron-phonon interactions.
  • The findings underscore the significance of considering electron-phonon coupling for accurate predictions in molecular and nanoscopic devices.
  • The method's foundation on the effective single-electron model allows for extension to time-dependent density functional theory.