Dimensionality effects in the LDOS of ferromagnetic hosts probed via STM: spin-polarized quantum beats and spin filtering
arXiv:1211.3406 · doi:10.1103/PhysRevB.87.125104
Abstract
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.
revised text
References in corpus (14)
- Kondo effect in quantum dots coupled to ferromagnetic leads
- NRG study of the Kondo effect in the presence of itinerant-electron ferromagnetism
- Electric-field controlled spin reversal in a quantum dot with ferromagnetic contacts
- The Kondo effect in ferromagnetic atomic contacts
- Long-range Kondo signature of a single magnetic impurity
- Gate-controlled spin-splitting in quantum dots with ferromagnetic leads in the Kondo regime
- Kondo effect in a semiconductor quantum dot coupled to ferromagnetic electrodes
- Nonequilibrium Kondo Effect in a Quantum Dot Coupled to Ferromagnetic Leads
- Mapping Itinerant Electrons around Kondo Impurities
- Kondo effect of an adsorbed cobalt phthalocyanine (CoPc) molecule: the role of quantum interference
- Spin-Dependent Ringing and Beats in a Quantum Dot System
- Kondo effect in transport through molecules adsorbed on metal surfaces: from Fano dips to Kondo peaks
- Kondo Resonance in the Presence of Spin-Polarized Currents
- Spin-Polarized STM for a Kondo adatom