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Spin selective pseudogap Kondo effect in a double quantum dot interferometer with Rashba interaction.

Piotr Stefański1

  • 1Institute of Molecular Physics of the Polish Academy of Sciences, ul. Smoluchowskiego 17, 60-179 Poznań, Poland. piotrs@ifmpan.poznan.pl

Journal of Physics. Condensed Matter : an Institute of Physics Journal
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PubMed
Summary
This summary is machine-generated.

This study reveals how a Rashba field can induce spin polarization in quantum dots without an external magnetic field. This phenomenon is crucial for understanding electron correlations and spin effects in quantum systems.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Computing
  • Mesoscopic Physics

Background:

  • Investigates a theoretical model of two quantum dots (Kondo and noninteracting) in an Aharonov-Bohm ring.
  • The system is coupled to normal leads, creating a correlated impurity in a host with energy and flux-dependent density of states.

Purpose of the Study:

  • To theoretically investigate spin polarization induced by a Rashba field in a quantum dot system.
  • To explore the role of electron correlations and the Aharonov-Bohm ring geometry.

Main Methods:

  • Theoretical modeling of a two-quantum dot system (Kondo and noninteracting) within an Aharonov-Bohm ring.
  • Mapping the configuration to a correlated impurity model with energy and flux-dependent density of states.
  • Analyzing the effect of a Rashba field on the system's electronic properties.

Main Results:

  • A Rashba field enables spin-selective pseudogap opening when the noninteracting dot level aligns with the Fermi energy.
  • This leads to reduced electron correlations in the Kondo dot and induces spin polarization at the Fermi level.
  • The observed spin polarization occurs without any external exchange field.

Conclusions:

  • Rashba-field-induced spin polarization is a key phenomenon in this quantum dot system.
  • The maximum polarization is achieved at a specific Kondo dot level, linked to the Anderson impurity Kondo temperature.
  • This work offers insights into controlling spin properties in quantum devices.