Coherent dynamics of atomic spins on a surface

Research output: ThesisDissertation (TU Delft)

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Abstract

This thesis presents experiments on the free, coherent spin dynamics ofmagnetic nanostructures built out of individual titanium atoms adsorbed on bilayer MgOislands grown on a Ag(100) crystal inside a scanning tunneling microscope (STM).We use the exchange field of the spin-polarized probe tip to tune the eigenstates of the magnetic structures to superpositions of the Zeeman product states. These superpositions appear as avoided level crossings of the eigenenergies as a function of tip-atom distance and are detected through electron spin resonance (ESR) measurements. Subsequently,we put the STMtip at the position where we detect an avoided crossing and we perform a DC pump-probe experiment. Here, the pump pulse causes a single spin flip on the atom under state tip which is then allowed to evolve freely for some time t until it is measured by the subsequent probe pulse. By varying the time t between pump and probe over many experiments, we are able to trace out the evolution of the spin under the tip with nanosecond time resolution....
Original languageEnglish
QualificationDoctor of Philosophy
Awarding Institution
  • Delft University of Technology
Supervisors/Advisors
  • Otte, Sander, Supervisor
  • van der Sar, T., Advisor
Award date27 May 2024
Print ISBNs978-94-6384-580-9
DOIs
Publication statusPublished - 2024

Keywords

  • scanning tunneling microscopy (STM)
  • Electron spin resonance (ESR)
  • Pump-probe
  • single atom magnetism

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