Bulletin of the American Physical Society
APS March Meeting 2024
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session G49: Novel Spin Qubits
11:30 AM–2:18 PM,
Tuesday, March 5, 2024
Room: 200G
Sponsoring
Units:
DQI DCMP GMAG
Chair: Charles Tahan, Laboratory for Physical Sciences
Abstract: G49.00003 : Probing the single-particle valley relaxation time in bilayer graphene quantum dots*
12:18 PM–12:30 PM
Presenter:
Katrin Hecker
(RWTH Aachen University)
Authors:
Katrin Hecker
(RWTH Aachen University)
Luca Banszerus
(Center for Quantum Devices, University of Copenhagen)
Lin Wang
(University of Konstanz)
Samuel Möller
(RWTH Aachen University)
Kenji Watanabe
(National Institute for Materials Science)
Takashi Taniguchi
(International Center for Materials Nanoarchitectonics, Tsukuba)
Guido Burkard
(University of Konstanz)
Christian Volk
(RWTH Aachen University)
Christoph Stampfer
(RWTH Aachen University)
Here, we report single-particle valley relaxation times of up to 7 μs in a BLG quantum dot, sufficiently long to utilize a valley state for coherent manipulation. The observed dependency of T1 on the perpendicular magnetic field can be described qualitatively and quantitatively by a model considering T1 to be limited by electron-phonon coupling. We identify coupling to acoustic phonons via bond length change and via the deformation potential as the limiting mechanisms.
*This project has received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement No. 881603 (Graphene Flagship) and from the European Research Council (ERC) under grant agreement No. 820254, the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany's Excellence Strategy - Cluster of Excellence Matter and Light for Quantum Computing (ML4Q) EXC 2004/1 - 390534769, through DFG (STA 1146/11-1), and by the Helmholtz Nano Facility.
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