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Interference Effects in a Tunable Quantum Point Contact Integrated with an Electronic Cavity

Chengyu Yan1,2,*, Sanjeev Kumar1,2, Michael Pepper1,2, Patrick See3, Ian Farrer4,†, David Ritchie4, Jonathan Griffiths4, and Geraint Jones4

  • 1London Centre for Nanotechnology, 17-19 Gordon Street, London WC1H 0AH, United Kingdom
  • 2Department of Electronic and Electrical Engineering, University College London, Torrington Place, London WC1E 7JE, United Kingdom
  • 3National Physical Laboratory, Hampton Road, Teddington, Middlesex TW11 0LW, United Kingdom
  • 4Cavendish Laboratory, J.J. Thomson Avenue, Cambridge CB3 OHE, United Kingdom

  • *uceeya3@ucl.ac.uk
  • †Present address: Department of Electronic and Electrical Engineering, University of Sheffield, Mappin Street, Sheffield S1 3JD, United Kingdom.
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Phys. Rev. Applied 8, 024009 – Published 17 August, 2017

DOI: https://doi.org/10.1103/PhysRevApplied.8.024009

Abstract

We show experimentally how quantum interference can be produced using an integrated quantum system comprising an arch-shaped short quantum wire (or quantum point contact, QPC) of 1D electrons and a reflector forming an electronic cavity. On tuning the coupling between the QPC and the electronic cavity, fine oscillations are observed when the arch QPC is operated in the quasi-1D regime. These oscillations correspond to interference between the 1D states and a state which is similar to the Fabry-Perot state and suppressed by a small transverse magnetic field of ±60  mT. Tuning the reflector, we find a peak in resistance which follows the behavior expected for a Fano resonance. We suggest that this is an interesting example of a Fano resonance in an open system which corresponds to interference at or near the Ohmic contacts due to a directly propagating, reflected discrete path and the continuum states of the cavity corresponding to multiple scattering. Remarkably, the Fano factor shows an oscillatory behavior taking peaks for each fine oscillation, thus, confirming coupling between the discrete and continuum states. The results indicate that such a simple quantum device can be used as building blocks to create more complex integrated quantum circuits for possible applications ranging from quantum-information processing to realizing the fundamentals of complex quantum systems.

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Phys. Rev. Applied 8, 024009– Published 17 August, 2017
  • Received 12 April 2017

© 2017 American Physical Society

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