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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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Quantum scattering in driven single- and double-barrier systems.

Martin Gärttner1, Florian Lenz, Christoph Petri

  • 1Theoretische Chemie, Physikalisch Chemisches Institut, Universität Heidelberg, Im Neuenheimer Feld 253, 69120 Heidelberg, Germany. martin.gaerttner@pci.uni-heidelberg.de

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|September 28, 2010
PubMed
Summary
This summary is machine-generated.

We explored quantum transmission in driven barrier systems, finding that high frequencies allow simplified models and that varying barrier phases impacts electron flow. This reveals new quantum pumping possibilities.

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Area of Science:

  • Quantum mechanics
  • Condensed matter physics
  • Mesoscopic systems

Background:

  • Understanding quantum transport in driven systems is crucial for novel electronic devices.
  • Nonlinear driving regimes and their effects on quantum phenomena remain an active research area.

Purpose of the Study:

  • Investigate quantum transmission through driven single- and double-barrier systems in the nonlinear regime.
  • Explore the validity of effective potential descriptions in high-frequency driving.
  • Analyze inelastic processes, resonant tunneling, and photon-assisted tunneling.

Main Methods:

  • Numerical simulations of quantum transmission.
  • Exploration of a broad parameter range, including different frequency regimes.
  • Analysis of non-sinusoidal driving laws for single barriers.
  • Study of relative phase variations in double barriers.

Main Results:

  • An effective, time-independent potential description is applicable in the high-frequency regime.
  • Detailed analysis of inelastic processes, resonant tunneling, and photon-assisted tunneling.
  • Non-sinusoidal driving laws lead to reduced symmetries and affect quantum pumping.
  • Variation of the relative phase in double barriers significantly impacts transmission.

Conclusions:

  • The study provides insights into quantum transport under strong nonlinear driving.
  • Findings highlight the potential for controlling quantum phenomena through driving parameters and barrier configurations.
  • The research contributes to the understanding of quantum pumping and tunneling effects.