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Pulsed electron spin resonance spectroscopy in the Purcell regime

Ranjan, V; Probst, S; Albanese, B; Doll, A; Jacquot, O; Flurin, E; Heeres, R; ... Bertet, P; + view all (2020) Pulsed electron spin resonance spectroscopy in the Purcell regime. Journal of Magnetic Resonance Imaging , 310 , Article 106662. 10.1016/j.jmr.2019.106662. Green open access

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Abstract

In EPR, spin relaxation is typically governed by interactions with the lattice or other spins. However, it has recently been shown that given a sufficiently strong spin-resonator coupling and high resonator quality factor, the spontaneous emission of microwave photons from the spins into the resonator can become the main relaxation mechanism, as predicted by Purcell. With increasing attention on the use of microresonators for EPR to achieve high spin-number sensitivity it is important to understand how this novel regime influences measured EPR signals, for example the amplitude and temporal shape of the spin-echo. We study this regime theoretically and experimentally, using donor spins in silicon, under different conditions of spin-linewidth and coupling homogeneity. When the spin-resonator coupling is distributed inhomogeneously, we find that the effective spin-echo relaxation time measured in a saturation recovery sequence strongly depends on the parameters for the detection echo. When the spin linewidth is larger than the resonator bandwidth, the different Fourier components of the spin echo relax with different characteristic times – due to the role of the resonator in driving relaxation – which results in the temporal shape of the echo becoming dependent on the repetition time of the experiment.

Type: Article
Title: Pulsed electron spin resonance spectroscopy in the Purcell regime
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.jmr.2019.106662
Publisher version: https://doi.org/10.1016/j.jmr.2019.106662
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Electron paramagnetic resonance, Purcell effect, Superconducting resonators, Quantum limited amplifier
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: https://discovery.ucl.ac.uk/id/eprint/10090089
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