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Phonon spectral density in a GaAs/AlGaAs double quantum dot

A. Hofmann, C. Karlewski, A. Heimes, C. Reichl, W. Wegscheider, G. Schön, K. Ensslin, T. Ihn, and V. F. Maisi
Phys. Rev. Research 2, 033230 – Published 10 August 2020
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  • INTRODUCTION
  • EXPERIMENTS
  • THEORETICAL MODEL
  • DISCUSSION
  • CONCLUSION
  • ACKNOWLEDGMENTS
    • References

    Abstract

    We study phonon emission in a GaAs/AlGaAs double quantum dot by monitoring the tunneling of a single electron between the two dots. We prepare the system such that a known amount of energy is emitted in the transition process. The energy is converted into lattice vibrations, and the resulting tunneling rate depends strongly on the phonon scattering and its effective phonon spectral density. We are able to fit the measured transition rates and see imprints of interference of phonons with themselves causing oscillations in the transition rates.

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    • Received 24 December 2019
    • Revised 10 April 2020
    • Accepted 29 April 2020

    DOI:https://doi.org/10.1103/PhysRevResearch.2.033230

    Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

    Published by the American Physical Society

    Physics Subject Headings (PhySH)

    1. Research Areas
    Electron relaxationElectron-phonon couplingPhonons
    1. Physical Systems
    Quantum dotsTwo-dimensional electron system
    Condensed Matter, Materials & Applied Physics

    Authors & Affiliations

    A. Hofmann1,*, C. Karlewski2,3, A. Heimes2, C. Reichl1, W. Wegscheider1, G. Schön2,3, K. Ensslin1, T. Ihn1, and V. F. Maisi1,†

    • 1Solid State Physics Laboratory, ETH Zurich, CH-8093 Zurich, Switzerland
    • 2Institut für Theoretische Festkörperphysik, Karlsruhe Institute of Technology, DE-76131 Karlsruhe, Germany
    • 3Institute of Nanotechnology, Karlsruhe Institute of Technology, DE-76344 Eggenstein-Leopoldshafen, Germany

    • *Present Address: Institute of Science and Technology Austria, Am Campus 1, 3400 Klosterneuburg, Austria; andrea.hofmann@ alumni.ethz.ch
    • †Present Address: Department of Physics and NanoLund, Lund University, Box 118, 22100 Lund, Sweden; ville.maisi@ftf.lth.se

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    Issue

    Vol. 2, Iss. 3 — August - October 2020

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