Self-Stimulated Pulse Echo Trains from Inhomogeneously Broadened Spin Ensembles

We show experimentally and describe theoretically how a conventional magnetic resonance Hahn echo sequence can lead to a self-stimulated pulse echo train when an inhomogeneously broadened spin ensemble is coupled to a resonator. Effective strong coupling between the subsystems assures that the first...

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Bibliographic Details
Published in:Physical review letters 2020-09, Vol.125 (13), p.1-137702, Article 137702
Main Authors: Debnath, Kamanasish, Dold, Gavin, Morton, John J. L., Mølmer, Klaus
Format: Article
Language:English
Subjects:
Magnetic resonance
Mean field theory
Subsystems
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Summary:We show experimentally and describe theoretically how a conventional magnetic resonance Hahn echo sequence can lead to a self-stimulated pulse echo train when an inhomogeneously broadened spin ensemble is coupled to a resonator. Effective strong coupling between the subsystems assures that the first Hahn echo can act as a refocusing pulse on the spins, leading to self-stimulated secondary echoes. Within the framework of mean field theory, we show that this process can continue multiple times leading to a train of echoes. We introduce an analytical model that explains the shape of the first echo and numerical results that account well for the experimentally observed shape and strength of the echo train and provides insights into the collective effects involved.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.125.137702