Transition between Quantum States in a Parallel-Coupled Double Quantum Dot

J. C. Chen, A. M. Chang, and M. R. Melloch
Phys. Rev. Lett. 92, 176801 – Published 27 April 2004
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Abstract

Strong electron and spin correlations in a double quantum dot (DQD) can give rise to different quantum states. We observe a continuous transition from a Kondo state exhibiting a single-peak Kondo resonance to another exhibiting a double peak by increasing the interdot coupling (t) in a parallel-coupled DQD. The transition into the double-peak state provides evidence for spin entanglement between the excess electrons on each dot. Toward the transition, the peak splitting merges and becomes substantially smaller than t because of strong Coulomb effects. Our device tunability bodes well for future quantum computation applications.

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  • Received 12 May 2003

DOI:https://doi.org/10.1103/PhysRevLett.92.176801

©2004 American Physical Society

Authors & Affiliations

J. C. Chen1, A. M. Chang1,*, and M. R. Melloch2

  • 1Department of Physics, Purdue University, West Lafayette, Indiana 47907, USA
  • 2School of Electrical and Computer Engineering, Purdue University, West Lafayette, Indiana 47907, USA

  • *Current address: Department of Physics, Duke University, Durham, NC 27708, USA.

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Issue

Vol. 92, Iss. 17 — 30 April 2004

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