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O: Fachverband Oberflächenphysik
O 16: Surface Dynamics & Electron-Driven Processes
O 16.10: Vortrag
Montag, 18. März 2024, 17:15–17:30, MA 141
A continuous-wave/pulsed X-band electron spin resonance spectrometer operating in ultra-high vacuum for the study of low dimensional spin ensembles — Franklin Cho1,2, Juyoung Park1,2, Soyoung Oh1,2, Jisoo Yu1,2, Yejin Jeong1,2, Luciano Colazzo1,2, Lukas Spree1,2, Caroline Hommel1,2, Arzhang Ardavan3, Giovanni Boero4, and •Fabio Donati1,2 — 1IBS Center for Quantum Nanoscience, South Korea — 2Department of Physics, Ewha Womans University, South Korea — 3Clarendon Laboratory, University of Oxford, UK — 4Microsystems Laboratory, EPFL, Switzerland
Surface-adsorbed molecular spin qubits have been attracting growing interest as a new platform for coherently controlled phenomena at the atomic scale. The localization at the surface of the molecular spins imposes to employ specifically designed setups to achieve sufficient spin sensitivity and operate in ultra-high vacuum. In this work, we report the development of a UHV continuous-wave and pulsed X-band electron spin resonance (ESR) spectrometer operating down to 10 K. The use of a half-wavelength microstrip line resonator made of epitaxially grown copper films on single crystal Al2O3 substrates allows achieving a sensitivity of 6.5×1010 spins G−1 Hz−1/2 on a surface of about 1 mm2. Surface characterizations using atomic force microscopy, low-energy electron diffraction, and scanning tunneling microscopy show that the Cu surface is atomically clean, flat, and single crystalline. Advanced pulsed ESR experimental capabilities including dynamical decoupling and electron-nuclear double resonance are demonstrated.
Keywords: Electron spin resonance; Molecular spin qubits; Quantum coherent phenomena; Ultra-high vacuum; Microstrip line resonator