Dimensionality effects in the local density of states of ferromagnetic hosts probed via STM: Spin-polarized quantum beats and spin filtering

被引：2

作者：

Seridonio, A. C. ^{[1
,2
]}

Leandro, S. C. ^{[1
]}

Guessi, L. H. ^{[1
]}

Siqueira, E. C. ^{[1
]}

Souza, F. M. ^{[3
]}

Vernek, E. ^{[3
]}

Figueira, M. S. ^{[4
]}

Egues, J. C. ^{[5
]}

机构：

[1] Univ Estadual Paulista, Dept Quim & Fis, BR-15385000 Ilha Solteira, SP, Brazil

[2] Univ Estadual Paulista, IGCE, Dept Fis, BR-13506970 Rio Claro, SP, Brazil

[3] Univ Fed Uberlandia, Inst Fis, BR-38400902 Uberlandia, MG, Brazil

[4] Univ Fed Fluminense, Inst Fis, BR-24210340 Niteroi, RJ, Brazil

[5] Univ Sao Paulo, Inst Fis Sao Carlos, BR-13560970 Sao Carlos, SP, Brazil

来源：

PHYSICAL REVIEW B | 2013年 / 87卷 / 12期

关键词：

DEPENDENT TRANSPORT; KONDO; RESONANCE; IMPURITY; CONTACTS; SURFACE; DOT;

D O I：

10.1103/PhysRevB.87.125104

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We theoretically investigate the local density of states (LDOS) probed by an 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's 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. Although the LDOS for the metallic surface shows a damped beating pattern, it exhibits the 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. DOI: 10.1103/PhysRevB.87.125104

引用

页数：11

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