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Phonon-limited valley life times in single-particle bilayer graphene quantum dots

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2024

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

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European Union (EU): 881603
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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The valley degree of freedom in honeycomb crystals such as 2D semiconductors, graphene and bilayer graphene is a promising carrier of quantum information alongside spin and charge. This is all the more true since gate-controlled single-particle quantum dots (QDs) have been demonstrated in bilayer graphene (BLG), paving the way for the realisation of spin and valley qubits. Although long spin relaxation times have recently been reported in BLG QDs, nothing is known about single-particle valley lifetimes. Here we report single-particle valley relaxation times (T1 times) exceeding several microseconds in electrostatically defined BLG QDs. The observed dependence of T1 on the perpendicular magnetic field can be understood qualitatively and quantitatively by a model in which T1 is limited by electron-phonon coupling. We identify coupling to acoustic phonons via the bond length change and via the deformation potential as the limiting mechanisms.

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ISO 690BANSZERUS, Luca, Katrin HECKER, Lin WANG, Samuel MÖLLER, Kenji WATANABE, Takashi TANIGUCHI, Guido BURKARD, Christian VOLK, Christoph STAMPFER, 2024. Phonon-limited valley life times in single-particle bilayer graphene quantum dots
BibTex
@unpublished{Banszerus2024Phono-71310,
  year={2024},
  doi={10.48550/arXiv.2402.16691},
  title={Phonon-limited valley life times in single-particle bilayer graphene quantum dots},
  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}
}
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