Regensburg 2022 – wissenschaftliches Programm

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 24: New Methods and Developments: Spectroscopies, Diffraction and Others (joint session O/KFM)

KFM 24.4: Vortrag

Donnerstag, 8. September 2022, 11:30–11:45, H6

Development of an electron spin resonance spectrometer in ultra-high vacuum for surface spins — •Juyoung Park1,2, Franklin H. Cho1,2, Jisoo Yu1,2, Luciano Colazzo1,2, Yejin Jeong1,2, Junjie Liu3, Arzhang Ardavan3, Giovanni Boero4, Andreas Heinrich1,2, and Fabio Donati1,21Center for Quantum Nanoscience, Institute for Basic Science, Seoul, Republic of Korea — 2Ewha Womans University, Seoul, Republic of Korea — 3The Clarendon Laboratory, Department of Physics, University of Oxford, Oxford, UK — 4Ecole Polytechnique Fédérale de Lausanne, Laboratory for Microsystems, Lausanne, Switzerland

We present the development of an electron spin resonance (ESR) spectrometer operating in ultra-high vacuum (UHV) for studying surface-adsorbed molecular and atomic spin systems. Such surface spin systems are promising platforms for potential applications in quantum computing and information processing [Science 366, 509 (2019)]. Our spectrometer is capable of both continuous-wave and pulsed ESR measurement in the temperature range of 2.5 K to 300 K. The surface-sensitivity is attained using a surface-type microwave resonator with its resonance frequency in the X-band. The spectrometer is connected to a home-built in-situ preparation chamber which allows us to prepare and characterize surfaces with low-energy electron diffraction and Auger electron spectroscopy. We demonstrate that we are sensitive down to a monolayer of molecular film using organic radicals such as α,γ-Bisdiphenylene-β-phenylallyl, and metal phthalocyanine complexes such as vanadyl phthalocyanine.

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