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Non-universal transmission phase behaviour of a large quantum dot

Author

Listed:
  • Hermann Edlbauer

    (Univ. Grenoble Alpes, CNRS, Grenoble INP, Institut Néel)

  • Shintaro Takada

    (Univ. Grenoble Alpes, CNRS, Grenoble INP, Institut Néel
    National Institute of Advanced Industrial Science and Technology (AIST), National Metrology Institute of Japan (NMIJ))

  • Grégoire Roussely

    (Univ. Grenoble Alpes, CNRS, Grenoble INP, Institut Néel)

  • Michihisa Yamamoto

    (University of Tokyo
    RIKEN Center for Emergent Matter Science (CEMS))

  • Seigo Tarucha

    (University of Tokyo
    RIKEN Center for Emergent Matter Science (CEMS))

  • Arne Ludwig

    (Ruhr-Universität Bochum)

  • Andreas D. Wieck

    (Ruhr-Universität Bochum)

  • Tristan Meunier

    (Univ. Grenoble Alpes, CNRS, Grenoble INP, Institut Néel)

  • Christopher Bäuerle

    (Univ. Grenoble Alpes, CNRS, Grenoble INP, Institut Néel)

Abstract

The electron wave function experiences a phase modification at coherent transmission through a quantum dot. This transmission phase undergoes a characteristic shift of π when scanning through a Coulomb blockade resonance. Between successive resonances either a transmission phase lapse of π or a phase plateau is theoretically expected to occur depending on the parity of quantum dot states. Despite considerable experimental effort, this transmission phase behaviour has remained elusive for a large quantum dot. Here we report on transmission phase measurements across such a large quantum dot hosting hundreds of electrons. Scanning the transmission phase along 14 successive resonances with an original two-path interferometer, we observe both phase lapses and plateaus. We demonstrate that quantum dot deformation alters the sequence of phase lapses and plateaus via parity modifications of the involved quantum dot states. Our findings set a milestone towards an comprehensive understanding of the transmission phase of quantum dots.

Suggested Citation

  • Hermann Edlbauer & Shintaro Takada & Grégoire Roussely & Michihisa Yamamoto & Seigo Tarucha & Arne Ludwig & Andreas D. Wieck & Tristan Meunier & Christopher Bäuerle, 2017. "Non-universal transmission phase behaviour of a large quantum dot," Nature Communications, Nature, vol. 8(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:8:y:2017:i:1:d:10.1038_s41467-017-01685-z
    DOI: 10.1038/s41467-017-01685-z
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