Berlin 2024 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 43: Focus Session: Spins on Surfaces studied by Atomic Scale Spectroscopies IV
O 43.3: Vortrag
Mittwoch, 20. März 2024, 11:00–11:15, MA 004
Spin engineering in artificial atom-molecule hybridsS — •Wantong Huang1, Máté Stark1, 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
Protecting individual qubits from decoherence and relaxation is one of the crucial challenges for quantum information processing. Both, individual atoms as well as magnetic molecules consisting of one central spin surrounded by ligands, are promising building blocks and offer a route for nanoscale spintronics and future quantum devices. Here, we explore the magnetic properties and spin dynamics of artificially built hybrids of atomic and molecular spins. The resulting magnetic system consisting of an FePc molecule coupled to an Fe atom, forms a mixed spin(1/2,1) Heisenberg antiferromagnet. We show that the strong exchange coupling leads to a ground-state doublet. Thus, this hybrid behaves effectively like a spin-1/2 system which can be driven into electron spin resonance by means of scanning tunneling microscopy. Strikingly, the relaxation time of the hybrid is significantly enhanced compared to pristine FePc reaching 1 µs. Moreover, we show by building dimers of hybrids that their spins can be coupled providing a path to realizing larger structures.
Keywords: ESR-STM; Fe-FePc hybrids; Heisenberg Antiferromagnet; Relaxtion time; spin dynamics