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

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.

arXiv commentrevised text

References in corpus (38)

• Fano resonances in nanoscale structures
• Time-dependent transport in interacting and non-interacting mesoscopic systems
• The role of magnetic anisotropy in the Kondo effect
• Kondo effect in quantum dots coupled to ferromagnetic leads
• Theory of the Fano Resonance in the STM Tunneling Density of States due to a Single Kondo Impurity
• 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
• Kondo effect in a quantum dot coupled to ferromagnetic leads: A numerical renormalization group analysis
• Nonequilibrium theory of scanning tunneling spectroscopy via adsorbate resonances: nonmagnetic and Kondo impurities
• Spin-Dependent Transport Through An Interacting Quantum Dot
• The Kondo effect in ferromagnetic atomic contacts
• Long-range Kondo signature of a single magnetic impurity
• Theory of Scanning Tunneling Spectroscopy of a Magnetic Adatom on a Metallic Surface
• Gate-controlled spin-splitting in quantum dots with ferromagnetic leads in the Kondo regime
• Differential Conductance and Quantum Interference in Kondo Systems
• Universality of the Kondo effect in quantum dots with ferromagnetic leads
• Kondo effect in a semiconductor quantum dot coupled to ferromagnetic electrodes
• Nonequilibrium Kondo Effect in a Quantum Dot Coupled to Ferromagnetic Leads
• Kondo quantum dot coupled to ferromagnetic leads: Numerical renormalization group study
• Kondo effect in quantum dots coupled to ferromagnetic leads with noncollinear magnetizations
• Tunneling into clean Heavy Fermion Compounds: Origin of the Fano Lineshape
• Interplay of the Kondo Effect and Spin-Polarized Transport in Magnetic Molecules, Adatoms and Quantum Dots
• Theory of real space imaging of Fermi surfaces
• First-principles Calculation of the Single Impurity Surface Kondo Resonance
• Mapping Itinerant Electrons around Kondo Impurities
• Kondo effect of a Co atom on Cu(111) in contact with an Fe tip
• Kondo effect of an adsorbed cobalt phthalocyanine (CoPc) molecule: the role of quantum interference
• Computational and experimental imaging of Mn defects on GaAs (110) cross-sectional surface
• The Influence of Magnetic Anisotropy on the Kondo Effect and Spin-Polarized Transport through Magnetic Molecules, Adatoms and Quantum Dots
• 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
• Beating in electronic transport through quantum dot based devices
• Underscreened Kondo effect in quantum dots coupled to ferromagnetic leads
• Spin-Polarized STM for a Kondo adatom
• Scanning Tunneling Microscope Operating as a Spin-diode
• Fano-Kondo Spin Filter
• Non-Zeeman splitting for a spin-resolved STM with a Kondo adatom in a spin-polarized two-dimensional electron gas