Charge stability of a triple quantum dot with a finite tunnel coupling

Soo-Young Lee and Yunchul Chung
Phys. Rev. B 87, 045302 – Published 3 January 2013

Abstract

We study charge stability of a symmetric triple quantum dot by using the Hund-Milliken method. As the interdot tunnel coupling increases from zero, the stability deviates continuously from that of the capacitance model. We demonstrate how the stability diagram is modified by the tunneling coupling, especially, around the sextuple point. It is shown that the characteristic feature of the sextuple point, omnidirectional charge transport, is maintained even though the sixfold degeneracy is lifted by the tunnel coupling. This is possible because the ground state near the broken sextuple point shows election or hole delocalization over the three quantum dots.

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  • Received 16 April 2012

DOI:https://doi.org/10.1103/PhysRevB.87.045302

©2013 American Physical Society

Authors & Affiliations

Soo-Young Lee1,2 and Yunchul Chung2,*

  • 1Max Planck Institute for the Physics of Complex Systems, Nöthnitzer Str. 38, D01187 Dresden, Germany
  • 2Department of Physics, Pusan National University, Busan 609-735, Korea

  • *ycchung@pusan.ac.kr

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Vol. 87, Iss. 4 — 15 January 2013

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