Data Repository - Impact of competing energy scales on the shell-filling sequence in elliptic bilayer graphene quantum dots

Zenodo (CERN European Organization for Nuclear Research)

Abstract

Data Repository for the Publication: Impact of competing energy scales on the shell-filling sequence in elliptic bilayer graphene quantum dots Abstract: We report on a detailed investigation of the shell-filling sequence in electrostatically defined elliptic bilayer graphene quantum dots (QDs) in the regime of low charge carrier occupation, N < 12, by means of magnetotransport spectroscopy and numerical calculations. We show the necessity of including both short-range electron-electron interaction and wavefunction-dependent valley g-factors for understanding the overall fourfold shell-filling sequence. These factors lead to an additional energy splitting at half-filling of each orbital state and different energy shifts in out-of-plane magnetic fields. Analysis of 31 different BLG QDs reveals that both valley g-factor and electron-electron interaction induced energy splitting increase with decreasing QD size, validating theory. However, we find that the electrostatic charging energy of such gate-defined QDs does not correlate consistently with their size, indicating complex electrostatics. These findings offer significant insights for future BLG QD devices and circuit designs.

Authors 10

1. S. Möller Aachen JARA-FIT and 2nd Institute of Physics

   RWTH Aachen University

   Affiliation as printed

   JARA-FIT and 2nd Institute of Physics, RWTH Aachen University

2. Luca Banszerus Aachen JARA-FIT and 2nd Institute of Physics

   RWTH Aachen University

   Affiliation as printed

   JARA-FIT and 2nd Institute of Physics, RWTH Aachen University

3. Angelika Knothe

   University of Regensburg

   Affiliation as printed

   Institut für Theoretische Physik, Universität Regensburg

4. L. Valerius Aachen 2nd Institute of Physics

   RWTH Aachen University

   Affiliation as printed

   2nd Institute of Physics, RWTH Aachen University

5. K. Hecker Aachen JARA-FIT and 2nd Institute of Physics

   RWTH Aachen University

   Affiliation as printed

   JARA-FIT and 2nd Institute of Physics, RWTH Aachen University

6. Eike Icking Aachen JARA-FIT and 2nd Institute of Physics

   RWTH Aachen University

   Affiliation as printed

   JARA-FIT and 2nd Institute of Physics, RWTH Aachen University

7. Kenji Watanabe

   National Institute for Materials Science

   Affiliation as printed

   Research Center for Functional Materials, National Institute for Materials Scienc

8. Takashi Taniguchi

   National Institute for Materials Science

   Affiliation as printed

   International Center for Materials Nanoarchitectonics,National Institute for Materials Science

9. Christian Volk Aachen JARA-FIT and 2nd Institute of Physics

   RWTH Aachen University

   Affiliation as printed

   JARA-FIT and 2nd Institute of Physics, RWTH Aachen University

10. Christoph Stampfer Aachen JARA-FIT and 2nd Institute of Physics

    RWTH Aachen University

    Affiliation as printed

    JARA-FIT and 2nd Institute of Physics, RWTH Aachen University