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Phonon-limited valley lifetimes in single-particle bilayer graphene quantum dots

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2025

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Banszerus, Luca
Hecker, Katrin
Möller, Samuel
Watanabe, Kenji
Taniguchi, Takashi
Volk, Christian
Stampfer, Christoph

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http://nbn-resolving.de/urn:nbn:de:bsz:352-2-1ephpwf5i5zd82
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https://doi.org/10.1103/dkgn-pfjb
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CC BY 4.0

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European Union (EU): 820254
Deutsche Forschungsgemeinschaft (DFG): EXC 2004/1-390534769
Deutsche Forschungsgemeinschaft (DFG): STA 1146/11-1
Deutsche Forschungsgemeinschaft (DFG): 425217212

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Physical Review B. American Physical Society (APS). 2025, 112(3), 035409. ISSN 2469-9950. eISSN 2469-9969. VerfĂĽgbar unter: doi: 10.1103/dkgn-pfjb

Zusammenfassung

The valley degree of freedom in two-dimensional (2D) semiconductors, such as gapped bilayer graphene (BLG) and transition metal dichalcogenides, is a promising carrier of quantum information in the emerging field of valleytronics. While valley dynamics have been extensively studied for moderate band gap 2D semiconductors using optical spectroscopy techniques, very little is known about valley lifetimes in narrow band gap BLG, which is difficult to study using optical techniques. Here, we report single-particle valley relaxation times 𝑇1 exceeding several microseconds in electrostatically defined BLG quantum dots using a pulse-gating technique. The observed dependence of 𝑇1 on perpendicular magnetic field can be understood qualitatively and quantitatively by a model in which 𝑇1 is limited by electron-phonon coupling. We identify the coupling to acoustic phonons via the bond length change and via the deformation potential as the limiting mechanisms.

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Phonon-limited valley lifetimes in single-particle bilayer graphene quantum dots
(2025) Hecker, Katrin; Banszerus, Luca; Wang, Lin; Möller, Samuel; Watanabe, Kenji; Taniguchi, Takashi; Burkard, Guido; Volk, Christian; Stampfer, Christoph

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ISO 690BANSZERUS, Luca, Katrin HECKER, Lin WANG, Samuel MĂ–LLER, Kenji WATANABE, Takashi TANIGUCHI, Guido BURKARD, Christian VOLK, Christoph STAMPFER, 2025. Phonon-limited valley lifetimes in single-particle bilayer graphene quantum dots. In: Physical Review B. American Physical Society (APS). 2025, 112(3), 035409. ISSN 2469-9950. eISSN 2469-9969. VerfĂĽgbar unter: doi: 10.1103/dkgn-pfjb
BibTex
@article{Banszerus2025-07-10Phono-74908,
  title={Phonon-limited valley lifetimes in single-particle bilayer graphene quantum dots},
  year={2025},
  doi={10.1103/dkgn-pfjb},
  number={3},
  volume={112},
  issn={2469-9950},
  journal={Physical Review B},
  author={Banszerus, Luca and Hecker, Katrin and Wang, Lin and Möller, Samuel and Watanabe, Kenji and Taniguchi, Takashi and Burkard, Guido and Volk, Christian and Stampfer, Christoph},
  note={Article Number: 035409}
}
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