Berlin 2024 – scientific programme
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O: Fachverband Oberflächenphysik
O 21: Focus Session: Spins on Surfaces studied by Atomic Scale Spectroscopies III
O 21.3: Talk
Tuesday, March 19, 2024, 11:15–11:30, MA 004
Single-shot measurement of the nuclear spin state of a single atom using ESR-STM — •Jinwon Lee1, Evert W. Stolte1, Hester Vennema1, Rik Broekhoven1, Esther Teng1, Philip Willke2, and Sander Otte1 — 1Department of Quantum Nanoscience, Kavli Institute of Nanoscience, Delft University of Technology, 2628 CJ Delft, The Netherlands — 2Physikalisches Institut, Karlsruhe Institute of Technology, 67131 Karlsruhe, Germany
Individual nuclear spins have arisen as promising candidates for the building blocks for quantum memory because they have longer lifetime and coherence time compared to electronic spin states. Most studies on individual nuclear spins have focused on the nuclear spins embedded in solids and single-molecule magnets, which have limited controllability due to their environment. Scanning tunneling microscopy with electron spin resonance (ESR-STM), which allows for precise placement of individual atoms on a surface, recently observed the nuclear spin state through the hyperfine interaction. However, time-resolved measurements for its relevant timescales have not been reported. In this work, we achieve single-shot measurements of the nuclear spin state of 49Ti atom with S=1/2 and I=7/2, adsorbed on MgO/Ag using ESR-STM. We apply continuous-wave RF electric field, which can drive ESR only when the atom has a certain nuclear spin state and observe whether ESR is driven or not by measuring tunneling conductance. This new approach enables time-resolved measurements of the nuclear spin state, and we measure its dwell time to be on the order of 100 ms, 6 orders of magnitude longer than the electronic spin in the same atom.
Keywords: Nuclear spin lifetime; Electron spin resonance; Scanning tunneling microscopy; Single-shot measurement; Atomic spins on surfaces