Impact of competing energy scales on the shell-filling sequence in elliptic bilayer graphene quantum dots
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| Main Authors: | , , , , , , , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866909176809127936 |
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| author | Möller, Samuel Banszerus, Luca Knothe, Angelika Valerius, Lucca Hecker, Katrin Icking, Eike Watanabe, Kenji Taniguchi, Takashi Volk, Christian Stampfer, Christoph |
| author_facet | Möller, Samuel Banszerus, Luca Knothe, Angelika Valerius, Lucca Hecker, Katrin Icking, Eike Watanabe, Kenji Taniguchi, Takashi Volk, Christian Stampfer, Christoph |
| contents | 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, $N \leq 12$, 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. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2305_09284 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Impact of competing energy scales on the shell-filling sequence in elliptic bilayer graphene quantum dots Möller, Samuel Banszerus, Luca Knothe, Angelika Valerius, Lucca Hecker, Katrin Icking, Eike Watanabe, Kenji Taniguchi, Takashi Volk, Christian Stampfer, Christoph Mesoscale and Nanoscale Physics 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, $N \leq 12$, 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. |
| title | Impact of competing energy scales on the shell-filling sequence in elliptic bilayer graphene quantum dots |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2305.09284 |