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Scaling behavior of electron decoherence in a graphene Mach-Zehnder interferometer

Author

Listed:
  • M. Jo

    (SPEC, CEA, CNRS, Université Paris-Saclay, CEA Saclay)

  • June-Young M. Lee

    (Korea Advanced Institute of Science and Technology)

  • A. Assouline

    (SPEC, CEA, CNRS, Université Paris-Saclay, CEA Saclay)

  • P. Brasseur

    (SPEC, CEA, CNRS, Université Paris-Saclay, CEA Saclay)

  • K. Watanabe

    (National Institute for Materials Science)

  • T. Taniguchi

    (National Institute for Materials Science)

  • P. Roche

    (SPEC, CEA, CNRS, Université Paris-Saclay, CEA Saclay)

  • D. C. Glattli

    (SPEC, CEA, CNRS, Université Paris-Saclay, CEA Saclay)

  • N. Kumada

    (NTT Basic Research Laboratories, NTT Corporation)

  • F. D. Parmentier

    (SPEC, CEA, CNRS, Université Paris-Saclay, CEA Saclay)

  • H. -S. Sim

    (Korea Advanced Institute of Science and Technology)

  • P. Roulleau

    (SPEC, CEA, CNRS, Université Paris-Saclay, CEA Saclay)

Abstract

Over the past 20 years, many efforts have been made to understand and control decoherence in 2D electron systems. In particular, several types of electronic interferometers have been considered in GaAs heterostructures, in order to protect the interfering electrons from decoherence. Nevertheless, it is now understood that several intrinsic decoherence sources fundamentally limit more advanced quantum manipulations. Here, we show that graphene offers a unique possibility to reach a regime where the decoherence is frozen and to study unexplored regimes of electron interferometry. We probe the decoherence of electron channels in a graphene quantum Hall PN junction, forming a Mach-Zehnder interferometer1,2, and unveil a scaling behavior of decay of the interference visibility with the temperature scaled by the interferometer length. It exhibits a remarkable crossover from an exponential decay at higher temperature to an algebraic decay at lower temperature where almost no decoherence occurs, a regime previously unobserved in GaAs interferometers.

Suggested Citation

  • M. Jo & June-Young M. Lee & A. Assouline & P. Brasseur & K. Watanabe & T. Taniguchi & P. Roche & D. C. Glattli & N. Kumada & F. D. Parmentier & H. -S. Sim & P. Roulleau, 2022. "Scaling behavior of electron decoherence in a graphene Mach-Zehnder interferometer," Nature Communications, Nature, vol. 13(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-33078-2
    DOI: 10.1038/s41467-022-33078-2
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    References listed on IDEAS

    as
    1. R. H. Rodriguez & F. D. Parmentier & D. Ferraro & P. Roulleau & U. Gennser & A. Cavanna & M. Sassetti & F. Portier & D. Mailly & P. Roche, 2020. "Relaxation and revival of quasiparticles injected in an interacting quantum Hall liquid," Nature Communications, Nature, vol. 11(1), pages 1-8, December.
    2. I. Neder & N. Ofek & Y. Chung & M. Heiblum & D. Mahalu & V. Umansky, 2007. "Interference between two indistinguishable electrons from independent sources," Nature, Nature, vol. 448(7151), pages 333-337, July.
    3. E. Bocquillon & V. Freulon & J-.M Berroir & P. Degiovanni & B. Plaçais & A. Cavanna & Y. Jin & G. Fève, 2013. "Separation of neutral and charge modes in one-dimensional chiral edge channels," Nature Communications, Nature, vol. 4(1), pages 1-7, June.
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