Impurity scattering on the surface of topological-insulator thin films

被引：22

作者：

Shiranzaei, Mahroo ^{[1
]}

Parhizgar, Fariborz ^{[2
]}

Fransson, Jonas ^{[3
]}

Cheraghchi, Hosein ^{[1
]}

机构：

[1] Damghan Univ, Sch Phys, POB 36716-41167, Damghan, Iran

[2] IPM, Inst Res Fundamental Sci, Sch Phys, Tehran 193955531, Iran

[3] Uppsala Univ, Dept Phys & Astron, Box 516, SE-75121 Uppsala, Sweden

来源：

PHYSICAL REVIEW B | 2017年 / 95卷 / 23期

关键词：

HGTE QUANTUM-WELLS; SINGLE DIRAC CONE; BLACK PHOSPHORUS; STATES; BI2TE3; MONOLAYER; FERMION; BI2SE3; PHASE;

D O I：

10.1103/PhysRevB.95.235429

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We address the electronic structure of the surface states of topological-insulator thin films with embedded local nonmagnetic and magnetic impurities. Using the T -matrix expansion of the real-space Green's function, we derive the local density of electron states and corresponding spin-resolved densities. We show that the effects of the impurities can be tuned by applying an electric field between the surface layers. The emerging magnetic states are expected to play an important role both in the ferromagnetic mechanism of magnetic topological insulators and in its transport properties. In the case of magnetic impurities, we have categorized the possible cases for different spin directions of the impurities as well as the spin direction in which the spin-resolved density of electron states is calculated and have related them to the spin susceptibility of the system.

引用

页数：11

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