Element-specific X-Ray detection of electron paramagnetic resonance in thin films of quantum bits

Andrin Doll (), Zhewen Xu, Vladyslav Romankov, Giovanni Boero, Stefano Rusponi, Harald Brune, Zaher Salman and Jan Dreiser ()
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Andrin Doll: PSI Center for Photon Sciences CPS
Zhewen Xu: PSI Center for Photon Sciences CPS
Vladyslav Romankov: PSI Center for Photon Sciences CPS
Giovanni Boero: École Polytechnique Fédérale de Lausanne
Stefano Rusponi: École Polytechnique Fédérale de Lausanne
Harald Brune: École Polytechnique Fédérale de Lausanne
Zaher Salman: PSI Center for Neutron and Muon Sciences CNM
Jan Dreiser: PSI Center for Photon Sciences CPS

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: Abstract Element-specific magnetism accessible by synchrotron-based X-ray spectroscopy has proven to be valuable to study spin and orbital moments of transition metals and lanthanides in technologically relevant thin-film and monolayer samples. The access to coherent spin superposition states relevant for emergent quantum technologies remains, however, elusive with ordinary X-ray spectroscopy. Here, we approach the study of such quantum-coherent states via the X-ray detection of microwave-driven electron paramagnetic resonance, which involves much smaller signal levels than X-ray detected ferromagnetic resonance on classical magnets. We demonstrate the feasibility of this approach with thin films of phthalocyanine-based metal complexes containing copper or vanadium centers. We also identify X-ray specific phenomena that we relate to charge trapping of secondary electrons resulting from the decay of the X-ray excited core-hole state. Our findings pave the way toward the element-specific X-ray detection of coherent superposition states in monolayers of atomic and molecular spins on virtually arbitrary surfaces.

Date: 2024
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DOI: 10.1038/s41467-024-54586-3

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