%0 Journal Article
%A Möller, Sören
%A Banszerus, L.
%A Knothe, A.
%A Valerius, L.
%A Hecker, K.
%A Icking, E.
%A Watanabe, K.
%A Taniguchi, T.
%A Volk, Christian
%A Stampfer, C.
%T Impact of competing energy scales on the shell-filling sequence in elliptic bilayer graphene quantum dots
%J Physical review / B
%V 108
%N 12
%@ 2469-9950
%C Woodbury, NY
%I Inst.
%M FZJ-2024-03012
%P 125128
%D 2023
%X 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 wave-function-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 bilayer graphene (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.
%F PUB:(DE-HGF)16
%9 Journal Article
%R 10.1103/PhysRevB.108.125128
%U https://juser.fz-juelich.de/record/1025623