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Quantum phase transition in capacitively coupled double quantum dots.

Martin R Galpin1, David E Logan, H R Krishnamurthy

  • 1Physical and Theoretical Chemistry Laboratory, Oxford University, South Parks Road, Oxford OX1 3QZ, United Kingdom.

Physical Review Letters
|May 21, 2005
PubMed
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We studied two coupled quantum dots with two electrons, revealing a transition from spin-Kondo to charge-Kondo physics. This leads to a novel charge-ordered phase with unusual transport properties.

Area of Science:

  • Quantum physics
  • Condensed matter physics
  • Nanotechnology

Background:

  • Semiconducting quantum dots are crucial for quantum information processing.
  • Understanding electron interactions in coupled quantum dots is key to advancing quantum devices.

Purpose of the Study:

  • To investigate the electronic behavior of two capacitively coupled quantum dots with two electrons.
  • To explore the impact of increasing interdot coupling on quantum phenomena.

Main Methods:

  • Theoretical analysis using physical arguments.
  • Numerical renormalization group (NRG) methods for detailed understanding.

Main Results:

  • Observed a crossover from spin-Kondo to charge-Kondo physics.

Related Experiment Videos

  • Identified an intermediate SU(4) state with entangled spin and charge.
  • Discovered a Kosterlitz-Thouless quantum phase transition to a non-Fermi-liquid charge-ordered phase.

    • Conclusions:

    • The coupled quantum dot system exhibits rich, tunable electronic behavior.
    • The charge-ordered phase presents unique transport properties and residual entropy.
    • This work provides a detailed understanding of complex quantum phenomena in interacting quantum dots.