Regensburg 2022 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 51: Poster Wednesday: Atomic-Scale Studies of Spins on Surfaces with Scanning Tunneling Microscopy
O 51.7: Poster
Mittwoch, 7. September 2022, 18:00–20:00, P4
Long-lived spin states of Fe atomic chains on Cu2N via Hamiltonian engineering — Robbie J. G. Elbertse1, •Taehong Ahn2,3, Jiyoon Hwang2,3, Jeongmin Oh2,3, Jorn C. Rietveld1, Sander Otte1, Andreas J. Heinrich2,3, and Yujeong Bae2,3 — 1Department of Quantum Nanoscience, Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, Delft 2628 — 2Center for Quantum Nanoscience, Institute for Basic Science, Seoul, Korea — 3Department of Physics, Ewha Womans University, Seoul, Korea
A spin-polarized scanning tunneling microscope (STM) operating at various magnetic fields allows us to characterize the spin relaxation time of atomic structures on a surface, enabling Hamiltonian engineering. Here, we introduce 1D Fe atomic chains built on Cu2N/Cu(100) using a home-built STM and the evolution of their spin lifetime depending on the length of chains and the direction and magnitude of magnetic fields. To measure the spin lifetime ranging from 10−6 to 10 seconds, we used two different detection schemes; pump-probe [Science 329, 1628-1630 (2010)] and two state switching [Science 335, 196-199 (2012)]. We observed the spin lifetime of Fe chains changes non-monotonically as passing through a diabolic point with varying magnetic fields changes the degree of superposition of the two Neél states in the lowest energy eigenstates. To control the spin lifetime of Fe chains, we use magnetic fields as a control knob. Our work shows a capability of the spin lifetime in a large time scale and the precise control of spin dynamics in engineered atomic structures.