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This study explores the thermoelectric and spin thermoelectric properties of a T-shaped double quantum dot, revealing enhanced spin thermopower at specific Kondo effect stages. The system

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Area of Science:

  • Condensed Matter Physics
  • Quantum Dots
  • Spintronics

Background:

  • Investigating thermoelectric and spin thermoelectric properties is crucial for developing advanced quantum devices.
  • The Kondo effect in quantum dots influences their electronic transport characteristics.

Purpose of the Study:

  • To theoretically investigate the thermoelectric and spin thermoelectric properties of a T-shaped double quantum dot.
  • To analyze the impact of temperature, lead spin polarization, and dot level position on these properties within the two-stage Kondo effect regime.

Main Methods:

  • Theoretical approach using the numerical renormalization group (NRG) technique.
  • Analysis of the (spin) Seebeck coefficient, power factor, and figure of merit.
  • Examination of thermal conductance and its relation to the Wiedemann-Franz law.

Main Results:

  • The thermal conductance follows a modified Wiedemann-Franz law, even with suppressed Kondo effect stages.
  • Spin thermopower is significantly enhanced at temperatures corresponding to the second stage of Kondo screening.
  • The spin-thermoelectric response shows high sensitivity to lead spin polarization, with effects observed at ~1% polarization.

Conclusions:

  • The interplay between the two-stage Kondo effect and the induced exchange field dictates the spin-thermoelectric response.
  • Gate voltage can tune the exchange field, allowing for optimization of spin thermopower.
  • This research offers insights into controlling spin-based thermoelectric effects in quantum dot systems.