Berlin 2024 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 70: Poster: Spins on Surfaces & Surface Magnetism
O 70.13: Poster
Mittwoch, 20. März 2024, 18:00–20:00, Poster C
Coherent control of artificial atom-molecule hybrids — •Máté Stark1, Wantong Huang1, Paul Greule1, Daria Sostina2, Constantin Weeber1, Jose Gálvez3, Christoph Sürgers1, Christoph Wolf3, Wolfgang Wernsdorfer1, and Philip Willke1 — 1Physikalisches Institut (PHI), Karlsruhe Institute of Technology, Karlsruhe, Germany — 2Institute of Quantum Materials and Technologies (IQMT), Karlsruhe Institute of Technology, Karlsruhe, Germany — 3Center for Quantum Nanoscience, Institute for Basic Science (IBS), Seoul, Republic of Korea
By harnessing the atomic precision of Scanning Tunneling Microscopy (STM) in tandem with Electron Spin Resonance (ESR), we show in this work that artificially built atom-molecule hybrids extend the scope of future building blocks towards more versatile qubit structures. Specifically, our focus is on a magnetic system comprising an iron phthalocyanine (FePc) molecule and an Fe atom, resulting in a mixed spin(1/2,1) antiferromagnetically coupled Heisenberg system. This chemical complex shows properties attributed to a spin-1/2 system, which we characterize by driving it into coherently controlled ESR. By using both pump-probe measurements and coherent control techniques, we find a remarkable enhancement in the relaxation time of the hybrid, reaching approximately 1us. This significantly surpasses the values of pristine FePc [1,2] and we attribute this enhancement to the correlation between the two spins in the dimer as well as to enhanced potential scattering. [1] Zhang, X., et al., Nat. Chem. 14 ,59-65 (2022); [2] Willke, P., et al., ACS nano 15, 17859-17965 (2021)
Keywords: Electron Spin Resonance; Scanning Tunneling Microscopy; Artificial Atomic Qubit; Coherent Control of Electron Spin; Qubit Characterization