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Published on: June 28, 2018
Quasiparticle interference around a magnetic impurity on a surface with strong spin-orbit coupling
Anna Stróżecka1, Asier Eiguren, Jose Ignacio Pascual
1Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, D14195 Berlin, Germany.
Abstract:
On surfaces with strong spin-orbit coupling, backscattering is forbidden since it requires flipping of the spin of the electron. It has been proposed that the forbidden scattering channels in such systems can be activated if time reversal symmetry is locally broken, for example, by a magnetic scattering center. Scanning tunneling spectroscopic maps of quasiparticle interference patterns around a single magnetic MnPc molecule on a Bi(110) surface reveal only spin-conserving scattering events. Simulations based on the Green's functions approach confirm that the charge-density interference patterns are unaffected by the magnetic state of the impurity. A fingerprint of backscattering processes appears, however, in the magnetization patterns, suggesting that only spin-polarized measurements can access this information.
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