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Tuning Nonlinear Charge Transport between Integer and Fractional Quantum Hall States

Stefano Roddaro, Nicola Paradiso, Vittorio Pellegrini, Giorgio Biasiol, Lucia Sorba, and Fabio Beltram
Phys. Rev. Lett. 103, 016802 – Published 29 June 2009
Physics logo See Viewpoint: Quasiparticle doppelgängers
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Abstract

Controllable point junctions between different quantum Hall phases are a necessary building block for the development of mesoscopic circuits based on fractionally charged quasiparticles. We demonstrate how particle-hole duality can be exploited to realize such point-contact junctions. We show an implementation for the case of two quantum Hall liquids at filling factors ν=1 and ν*1 in which both the fractional filling ν* and the coupling strength can be finely and independently tuned. A peculiar crossover from insulating to conducting behavior as ν* goes from 1/3 to 1 is observed. These results highlight the key role played on interedge tunneling by local charge depletion at the point contact.

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  • Received 24 December 2008

DOI:https://doi.org/10.1103/PhysRevLett.103.016802

©2009 American Physical Society

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Quasiparticle doppelgängers

Published 29 June 2009

By exploiting the concept of particle-hole duality, one can realize a point junction between integer and fractional quantum Hall phases, which constitutes a crucial building block towards possible applications of the quantum Hall effect.

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Authors & Affiliations

Stefano Roddaro1, Nicola Paradiso1, Vittorio Pellegrini1, Giorgio Biasiol2, Lucia Sorba1,2, and Fabio Beltram1

  • 1NEST, Scuola Normale Superiore and CNR-INFM, Piazza dei Cavalieri 7, I-56126 Pisa, Italy
  • 2Laboratorio Nazionale TASC-INFM, Area Science Park Basovizza, I-34012 Trieste, Italy

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Issue

Vol. 103, Iss. 1 — 3 July 2009

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