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Quantum phase transition and underscreened Kondo effect in electron transport through parallel double quantum dots.

Guo-Hui Ding1, Fei Ye, Bing Dong

  • 1Department of Physics, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|June 23, 2011
PubMed
Summary

We studied electron transport in double quantum dots, finding a spin-1 triplet state with ferromagnetic correlations at low coupling. Increasing coupling causes a phase transition to antiferromagnetic correlations, suppressing conductance.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Computing
  • Mesoscopic Physics

Background:

  • Quantum dots (QDs) are nanoscale semiconductor structures exhibiting quantum mechanical properties.
  • Understanding electron transport in coupled quantum dot systems is crucial for developing quantum devices.
  • Strong on-site Coulomb interaction and interdot coupling significantly influence system behavior.

Purpose of the Study:

  • To investigate electronic transport through a parallel double quantum dot (DQD) system.
  • To determine the ground state properties and zero-temperature transmission probability.
  • To explore the effects of interdot coupling on spin correlations and conductance.

Main Methods:

  • Numerical Renormalization Group (NRG) method applied to the DQD system.
  • Calculation of ground state and transmission probability at zero temperature.
  • Analysis of spin correlations and linear conductance under varying interdot coupling.

Main Results:

  • Ferromagnetic spin correlations and a spin-1 triplet ground state observed for small interdot tunnel coupling.
  • Underscreened Kondo effect leads to linear conductance reaching the unitary limit (2e^2/h).
  • Quantum phase transition to antiferromagnetic spin correlations occurs with increasing interdot coupling, suppressing conductance.

Conclusions:

  • The study reveals a tunable quantum phase transition in DQDs driven by interdot coupling.
  • Kondo effect and spin correlations play critical roles in determining electronic transport properties.
  • Findings provide insights into controlling quantum phenomena in DQD systems for potential applications.