Data Repository - Impact of competing energy scales on the shell-filling sequence in elliptic bilayer graphene quantum dots
DOI10.5281/zenodo.8300785Zenodo8300785MaRDI QIDQ6699213
Dataset published at Zenodo repository.
C. Volk, K. Watanabe, E. Icking, L. Valerius, L. Banszerus, K. Hecker, S. Möller, Angelika Knothe, T. Taniguchi, C. Stampfer
Publication date: 30 August 2023
Copyright license: Creative Commons Attribution 4.0 International
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.
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