The European Physical Journal B

, 87:145

Entanglement switching via the Kondo effect in triple quantum dots

  • S. B. Tooski
  • Bogdan R. Bułka
  • Rok Žitko
  • Anton Ramšak
Open AccessRegular Article

DOI: 10.1140/epjb/e2014-41025-6

Cite this article as:
Tooski, S.B., Bułka, B.R., Žitko, R. et al. Eur. Phys. J. B (2014) 87: 145. doi:10.1140/epjb/e2014-41025-6

Abstract

We consider a triple quantum dot system in a triangular geometry with one of the dots connected to metallic leads. Using Wilson’s numerical renormalization group method, we investigate quantum entanglement and its relation to the thermodynamic and transport properties in the regime where each of the dots is singly occupied on average, but with non-negligible charge fluctuations. It is shown that even in the regime of significant charge fluctuations the formation of the Kondo singlets induces switching between separable and perfectly entangled states. The quantum phase transition between unentangled and entangled states is analyzed quantitatively and the corresponding phase diagram is explained by exactly solvable spin model. In the framework of an effective model we also explain smearing of the entanglement transition for cases when the symmetry of the triple quantum dot system is relaxed.

Keywords

Mesoscopic and Nanoscale Systems
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© The Author(s) 2014

Authors and Affiliations

  • S. B. Tooski
    • 1
    • 2
  • Bogdan R. Bułka
    • 1
  • Rok Žitko
    • 2
  • Anton Ramšak
    • 2
  1. 1.Institute of Molecular PhysicsPolish Academy of SciencesPoznańPoland
  2. 2.Faculty of Mathematics and PhysicsUniversity of Ljubljana and Jožef Stefan InstituteLjubljanaSlovenia