Indirect exchange interaction between magnetic adatoms in graphene

被引：12

作者：

Krainov, I. V. ^{[1
,2
]}

Rozhansky, I. V. ^{[1
,2
,3
]}

Averkiev, N. S. ^{[1
]}

Lahderanta, E. ^{[2
]}

机构：

[1] Ioffe Inst, St Petersburg 194021, Russia

[2] Lappeenranta Univ Technol, FI-53851 Lappeenranta, Finland

[3] Peter Great St Petersburg Polytech Univ, St Petersburg 195251, Russia

来源：

PHYSICAL REVIEW B | 2015年 / 92卷 / 15期

基金：

俄罗斯科学基金会;

关键词：

D O I：

10.1103/PhysRevB.92.155432

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We present a theoretical study of indirect exchange interaction between magnetic adatoms in graphene. The coupling between the adatoms to a graphene sheet is described in the framework of a tunneling Hamiltonian. We account for the possibility of this coupling being of resonant character if a bound state of the adatom effectively interacts with the continuum of 2D delocalized states in graphene. In this case the indirect exchange between the adatoms mediated by the 2D carriers appears to be substantially enhanced compared to the results known from Ruderman-Kittel-Kasuya-Yosida (RKKY) theory. Moreover, unlike the results of RKKY calculations in the case of resonant exchange, the magnetic coupling between the adatoms sitting over different graphene sublattices does not cancel each other. Thus, for a random distribution of the magnetic adatoms over a graphene surface, a nonzero magnetic interaction is expected. We also suggest the idea of controlling the magnetism by driving the tunnel coupling in and out of resonance by a gate voltage.

引用

页数：7

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