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HL: Fachverband Halbleiterphysik
HL 3: Quantum Dots and Wires: Transport
HL 3.2: Vortrag
Montag, 18. März 2024, 10:00–10:15, EW 202
Coupling a single spin to high-frequency motion — Federico Fedele1, •Federico Cerisola1,2, L. Bresque3, F. Vigneau1, J. Monsel4, A. Palyi5, J. Anders2,6, and Natalia Ares1 — 1Univ. of Oxford, Oxford, UK — 2Univ. of Exeter, Exeter, UK — 3Univ. Grenoble Alpes, CNRS, Grenoble, France — 4Chalmers Univ. of Technology, Göteborg, Sweden — 5Budapest Univ. of Technology, Budapest, Hungary — 6Univ. of Potsdam, Potsdam, Germany
Coupling a single spin to mechanical motion is exciting from a fundamental perspective and is also at the heart of applications such as quantum sensing, long-distance spin-spin coupling, and classical and quantum information processing. Previous experiments have observed such coupling in low-frequency mechanical resonators that are mostly confined to the classical regime, such as diamond cantilevers. Here we report the first experimental demonstration of spin-mechanical coupling with a high-frequency resonator. We achieve this all-electrically on a fully suspended carbon nanotube device. A new mechanism gives rise to this coupling, which stems from spin-orbit coupling, and it is not mediated by strain. We observe both resonant and off-resonant coupling as a shift and broadening of the electron dipole spin resonance, respectively. We develop a complete theoretical model taking into account the tensor form of the coupling and non-linearity in the motion. Our results advance spin-mechanical platforms to an uncharted regime, with promising applications ranging from the operation of fully quantum engines to the demonstration of macroscopic superpositions, to quantum simulators.
Keywords: Spin qubit; Nano-mechanical resonator; Spin mechanical coupling; Carbon nanotube