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 Park^1,2, Franklin H. Cho^1,2, Jisoo Yu^1,2, Luciano Colazzo^1,2, Yejin Jeong^1,2, Junjie Liu³, Arzhang Ardavan³, Giovanni Boero⁴, Andreas Heinrich^1,2, and Fabio Donati^1,2 — ¹Center 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.