Bulletin of the American Physical Society
APS March Meeting 2021
Volume 66, Number 1
Monday–Friday, March 15–19, 2021; Virtual; Time Zone: Central Daylight Time, USA
Session C42: Electronic and Thermal Transport Properties of Graphene
3:00 PM–5:48 PM,
Monday, March 15, 2021
Sponsoring
Unit:
DCMP
Chair: Di Chen, Peking University
Abstract: C42.00009 : Probing spin and valley states in bilayer graphene quantum dots
4:36 PM–4:48 PM
Live
Presenter:
Christian Volk
(II. Institute of Physics A, RWTH Aachen University)
Authors:
Christian Volk
(II. Institute of Physics A, RWTH Aachen University)
Luca Banszerus
(II. Institute of Physics A, RWTH Aachen University)
Samuel Möller
(II. Institute of Physics A, RWTH Aachen University)
Katrin Hecker
(II. Institute of Physics A, RWTH Aachen University)
Corinne Steiner
(II. Institute of Physics A, RWTH Aachen University)
Eike Icking
(II. Institute of Physics A, RWTH Aachen University)
Kenji Watanabe
(National Institute for Materials Science)
Takashi Taniguchi
(National Institute for Materials Science)
Christoph Stampfer
(II. Institute of Physics A, RWTH Aachen University)
Here, we study the spin and valley texture of a BLG QD. By magnetotransport measurements, we determine the shell filling sequence of the QD up to 12 electrons, the spin and valley g-factors and the singlet-triplet splitting. We address dynamic processes in a single electron QD by radio-frequency gate manipulation. From transient current spectroscopy of spin states, we extract a spin relaxation time exceeding 500 ns. The knowledge of the spin and valley texture as well as the relevant relaxation rates is essential for making bilayer graphene quantum dots suitable building blocks for spin qubit devices.
[1] L. Banszerus et al. Nano Lett. 20, 7709 (2020).
[2] L. Banszerus et al. Nano Lett. 20, 2005 (2020).
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