Fractional boundary charges in quantum dot arrays with density modulation

Jin-Hong Park, Guang Yang, Jelena Klinovaja, Peter Stano, and Daniel Loss
Phys. Rev. B 94, 075416 – Published 12 August 2016

Abstract

We show that fractional charges can be realized at the boundaries of a linear array of tunnel-coupled quantum dots in the presence of a periodically modulated onsite potential. While the charge fractionalization mechanism is similar to the one in polyacetylene, here the values of fractional charges can be tuned to arbitrary values by varying the phase of the onsite potential or the total number of dots in the array. We also find that the fractional boundary charges, unlike the in-gap bound states, are stable against static random disorder. We discuss the minimum array size where fractional boundary charges can be observed.

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  • Received 19 April 2016

DOI:https://doi.org/10.1103/PhysRevB.94.075416

©2016 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Jin-Hong Park1, Guang Yang1, Jelena Klinovaja2, Peter Stano1,3, and Daniel Loss1,2

  • 1RIKEN Center for Emergent Matter Science, Wako, Saitama 351-0198, Japan
  • 2Department of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland
  • 3Institute of Physics, Slovak Academy of Sciences, 845 11 Bratislava, Slovakia

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Issue

Vol. 94, Iss. 7 — 15 August 2016

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