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

Kurzanzeige
dc.contributor.authorBanszerus, Luca
dc.contributor.authorHecker, Katrin
dc.contributor.authorWang, Lin
dc.contributor.authorMöller, Samuel
dc.contributor.authorWatanabe, Kenji
dc.contributor.authorTaniguchi, Takashi
dc.contributor.authorBurkard, Guido
dc.contributor.authorVolk, Christian
dc.contributor.authorStampfer, Christoph
dc.date.accessioned2024-11-18T13:25:05Z
dc.date.available2024-11-18T13:25:05Z
dc.date.issued2024
dc.description.abstractThe 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.
dc.description.versionpublisheddeu
dc.identifier.arxiv2402.16691
dc.identifier.doi10.48550/arXiv.2402.16691
dc.identifier.urihttps://kops.uni-konstanz.de/handle/123456789/71310
dc.language.isoeng
dc.subject.ddc530
dc.titlePhonon-limited valley life times in single-particle bilayer graphene quantum dotseng
dc.typePREPRINT
dspace.entity.typePublication
kops.citation.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@unpublished{Banszerus2024Phono-71310,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}
}
kops.citation.iso690BANSZERUS, 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 dotsdeu
kops.citation.iso690BANSZERUS, 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 dotseng
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