Spin relaxation in a single-electron graphene quantum dot

L. Banszerus (), K. Hecker, S. Möller, E. Icking, K. Watanabe, T. Taniguchi, C. Volk and C. Stampfer
Additional contact information
L. Banszerus: RWTH Aachen University
K. Hecker: RWTH Aachen University
S. Möller: RWTH Aachen University
E. Icking: RWTH Aachen University
K. Watanabe: National Institute for Materials Science
T. Taniguchi: National Institute for Materials Science
C. Volk: RWTH Aachen University
C. Stampfer: RWTH Aachen University

Nature Communications, 2022, vol. 13, issue 1, 1-6

Abstract: Abstract The relaxation time of a single-electron spin is an important parameter for solid-state spin qubits, as it directly limits the lifetime of the encoded information. Thanks to the low spin-orbit interaction and low hyperfine coupling, graphene and bilayer graphene (BLG) have long been considered promising platforms for spin qubits. Only recently, it has become possible to control single-electrons in BLG quantum dots (QDs) and to understand their spin-valley texture, while the relaxation dynamics have remained mostly unexplored. Here, we report spin relaxation times (T1) of single-electron states in BLG QDs. Using pulsed-gate spectroscopy, we extract relaxation times exceeding 200 μs at a magnetic field of 1.9 T. The T1 values show a strong dependence on the spin splitting, promising even longer T1 at lower magnetic fields, where our measurements are limited by the signal-to-noise ratio. The relaxation times are more than two orders of magnitude larger than those previously reported for carbon-based QDs, suggesting that graphene is a potentially promising host material for scalable spin qubits.

Date: 2022
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DOI: 10.1038/s41467-022-31231-5

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