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Dimensionality effects in the LDOS of ferromagnetic hosts probed via STM: spin-polarized quantum beats and spin filtering

We theoretically investigate the local density of states (LDOS) probed by a STM tip of ferromagnetic metals hosting a single adatom and a subsurface impurity. We model the system via the two-impurity Anderson Hamiltonian. By using the equation of motion with the relevant Green functions, we derive analytical expressions for the LDOS of two host types: a surface and a quantum wire. The LDOS reveals Friedel-like oscillations and Fano interference as a function of the STM tip position. These oscillations strongly depend on the host dimension. Interestingly, we find that the spin-dependent Fermi wave numbers of the hosts give rise to spin-polarized quantum beats in the LDOS. While the LDOS for the metallic surface shows a damped beating pattern, it exhibits an opposite behavior in the quantum wire. Due to this absence of damping, the wire operates as a spatially resolved spin filter with a high efficiency.

preprint2013arXivOpen access
A. C. SeridonioS. C. LeandroL. H. GuessiE. C. SiqueiraF. M. SouzaE. VernekM. S. FigueiraJ. C. Egues
cond-mat.str-elcond-mat.mtrl-sci
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Open access8 authors2 topics
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A. C. SeridonioS. C. LeandroL. H. GuessiE. C. SiqueiraF. M. SouzaE. VernekM. S. FigueiraJ. C. Egues

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