Ordering of Magnetic Impurities and Tunable Electronic Properties of Topological Insulators

被引：179

作者：

Abanin, D. A. ^{[1
,2
]}

Pesin, D. A. ^{[3
]}

机构：

[1] Princeton Univ, Dept Phys, Princeton, NJ 08544 USA

[2] Princeton Univ, Princeton Ctr Theoret Sci, Princeton, NJ 08544 USA

[3] Univ Texas Austin, Dept Phys, Austin, TX 78712 USA

来源：

PHYSICAL REVIEW LETTERS | 2011年 / 106卷 / 13期

关键词：

D O I：

10.1103/PhysRevLett.106.136802

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We study collective behavior of magnetic adatoms randomly distributed on the surface of a topological insulator. Interactions of an ensemble of adatoms are frustrated, as the RKKY-type interactions of two adatom spins depend on the directions of spins relative to the vector connecting them. We show that at low temperatures the frustrated RKKY interactions give rise to two phases: an ordered ferromagnetic phase with spins pointing perpendicular to the surface, and a disordered spin-glass-like phase. The two phases are separated by a quantum phase transition driven by the magnetic exchange anisotropy. The ordered phase breaks time-reversal symmetry spontaneously, driving the surface states into a gapped state, which exhibits an anomalous quantum Hall effect and provides a realization of the parity anomaly. We find that the magnetic ordering is suppressed by potential scattering.

引用

页数：4

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