Regensburg 2022 – wissenschaftliches Programm
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QI: Fachverband Quanteninformation
QI 1: Implementations: Spin Qubits, Atoms, and Photons
QI 1.2: Vortrag
Montag, 5. September 2022, 10:00–10:15, H8
Spin relaxation times of single-electrons in bilayer graphene quantum dots — •Katrin Hecker1,2, Luca Banszerus1,2, Samuel Möller1,2, Eike Icking1,2, Kenji Watanabe3, Takashi Taniguchi3, Christian Volk1,2, and Christoph Stampfer1,2 — 12nd Institute of Physics, RWTH Aachen University, Germany — 2Peter Grünberg Institute (PGI-9), Forschungszentrum Jülich, Germany — 3National Institute for Materials Science, Japan
Thanks to its weak spin-orbit coupling and low nuclear spin density, bilayer graphene (BLG) promises long spin relaxation and coherence times, making this material a potentially interesting platform for spin based solid state quantum computation. Although the electrostatic confinement of single electrons in BLG quantum dot (QD) devices has been demonstrated, and their single particle spectrum has been studied in detail [1], their relaxation dynamics remain so far mostly unexplored [2]. Here, we report on measurements of the spin relaxation times (T1) of single-electron spin states in a BLG QD. Using pulsed gate spectroscopy, we extract T1 times exceeding 0.2ms at out-of-plane magnetic fields below 2T. The measured values for T1 show a strong dependence on the spin splitting and increase by about two orders of magnitude when decreasing the magnetic field from 2-3T, suggesting that T1 could be significantly larger at low magnetic fields [3].
[1] A. Kurzmann et al., Phys. Rev. Lett. 123, 026803 (2019).
[2] L. Banszerus et al., Phys. Rev. B 103, L081404 (2021).
[3] L. Banszerus et al., arXiv 2110.13051 (2021).