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Coherent Spin Control of Single Molecules on a Surface

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Title
Coherent Spin Control of Single Molecules on a Surface
Author(s)
Philip Willke; Tobias Bilgeri; Xue Zhang; Yu Wang; Christoph Wolf; Aubin, Herve; Andreas Heinrich; Taeyoung Choi
Publication Date
2021-11-23
Journal
ACS Nano, v.15, no.11, pp.17959 - 17965
Publisher
American Chemical Society
Abstract
© 2021 The Authors. Published by American Chemical Society.Control of single electron spins constitutes one of the most promising platforms for spintronics, quantum sensing, and quantum information processing. Utilizing single molecular magnets as their hosts establishes an interesting framework since their molecular structure is highly flexible and chemistry-based large-scale synthesis directly provides a way toward scalability. Here, we demonstrate coherent spin manipulation of single molecules on a surface, which we control individually using a scanning tunneling microscope in combination with electron spin resonance. We previously found that iron phthalocyanine (FePc) molecules form a spin-1/2 system when placed on an insulating thin film of magnesium oxide (MgO). Performing Rabi oscillation and Hahn echo measurements, we show that the FePc spin can be coherently manipulated with a phase coherence time T2Echo of several hundreds of nanoseconds. Tunneling current-dependent measurements demonstrate that interaction with the tunneling electrons is the dominating source of decoherence. In addition, we perform Hahn echo measurements on small self-assembled arrays of FePc molecules. We show that, despite additional intermolecular magnetic coupling, spin resonance and T2Echo are much less perturbed by T1 spin flip events of neighboring spins than by the tunneling current. This will potentially allow for individual addressable molecular spins in self-assemblies and with application for quantum information processing.
URI
https://pr.ibs.re.kr/handle/8788114/10892
DOI
10.1021/acsnano.1c06394
ISSN
1936-0851
Appears in Collections:
Center for Quantum Nanoscience(양자나노과학 연구단) > 1. Journal Papers (저널논문)
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