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Interaction Effects and Charge Quantization in Single-Particle Quantum Dot Emitters.

Glenn Wagner1, Dung X Nguyen1, Dmitry L Kovrizhin1,2

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|April 13, 2019
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Summary
This summary is machine-generated.

This study questions the use of quantum dots with quantum Hall edge states for on-demand single-particle emission. Coulomb interactions disrupt charge quantization, impacting the viability of these sources for precise charge pulses.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Optics
  • Mesoscopic Physics

Background:

  • On-demand single-particle emitters are crucial for quantum technologies.
  • Quantum dots coupled to quantum Hall edge states are proposed as potential emitters.
  • Precise charge quantization in emitted particles is a key requirement.

Purpose of the Study:

  • To theoretically investigate an on-demand single-particle emitter model.
  • To analyze the impact of Coulomb interactions on charge quantization.
  • To assess the feasibility of quantum Hall edge states for single-particle sources.

Main Methods:

  • Theoretical modeling of a quantum dot coupled to a quantum Hall edge state.
  • Exact mapping of the model to the spin-boson problem.
  • Spin-boson master equation approach for current pulse calculation.

Main Results:

  • Coulomb interactions between the quantum dot and the chiral quantum Hall edge state destroy precise charge quantization.
  • The emitted wave packet exhibits a loss of charge quantization.
  • The study casts doubt on the viability of this setup for single-particle sources.

Conclusions:

  • The proposed on-demand single-particle emitter setup is likely not viable due to charge quantization destruction.
  • Further theoretical analysis using spin-boson dynamics is required to understand current pulse shapes.