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HL: Fachverband Halbleiterphysik

HL 103: Spintronics incl. quantum dynamics (MA with HL/TT)

HL 103.2: Talk

Friday, March 20, 2015, 10:00–10:15, EB 202

Stability of a single spin against readout — •Christoph Hübner¹, Benjamin Baxevanis^1,2, Alexander A. Khajetoorians^3,4, and Daniela Pfannkuche¹ — ¹I. Institute for Theoretical Physics, Hamburg University, Hamburg, Germany — ²Lorentz Institute, Leiden University, Leiden, The Netherlands — ³Institute of Applied Physics, Hamburg University, Hamburg, Germany — ⁴Institute of Applied Physics, Radboud University Nijmegen, Nijmegen, The Netherlands

A magnetic atom or cluster is extremely sensitive to interactions with a scanning tunneling microscope (STM), that is used to read and write the magnetic state [1]. On the other hand the symmetry of the substrate allows magnetic adatoms to retain their magnetization for minutes, which is extremely long on an atomic time scale [2]. We systematically study this protection against magnetization fluctuations in the presence of a magnetic field and scattering with electrons from the STM and substrate with a non-equilibrium master equation. A combination of spin and substrate symmetry is proposed that produces a stable magnetic orientation even in the presence of a magnetic field [3]. Additionally characteristic features are presented that allow to deduce the spin and substrate symmetry by measurement.

[1] A. A. Khajetoorians et al., Science 339, 55 (2013)

[2] T. Miyamachi et al., Nature 503, 242 (2013)

[3] C. Hübner et al., Phys. Rev. B 90, 155134 (2014)