Excitonic magneto-optical Kerr effect in two-dimensional transition metal dichalcogenides induced by spin proximity

被引：24

作者：

Henriques, J. C. G. ^{[1
,2
]}

Catarina, G. ^{[3
]}

Costa, A. T. ^{[3
]}

Fernandez-Rossier, J. ^{[3
]}

Peres, N. M. R. ^{[1
,2
,3
]}

机构：

[1] Univ Minho, Dept & Ctr Phys, Campus Gualtar, P-4710057 Braga, Portugal

[2] Univ Minho, QuantaLab, Campus Gualtar, P-4710057 Braga, Portugal

[3] Int Iberian Nanotechnol Lab INL, Ave Mestre Jose Veiga, P-4715330 Braga, Portugal

来源：

PHYSICAL REVIEW B | 2020年 / 101卷 / 04期

关键词：

VALLEY POLARIZATION; MONOLAYER MOTE2;

D O I：

10.1103/PhysRevB.101.045408

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In this paper, we develop the excitonic theory of the Kerr rotation angle in a two-dimensional (2D) transition metal dichalcogenide at zero magnetic field. The finite Kerr angle is induced by the interplay between spin-orbit splitting and proximity exchange coupling due to the presence of a ferromagnet. We compare the excitonic effect with the single-particle theory approach. We show that the excitonic properties of the 2D material lead to a dramatic change in the frequency dependence of the optical response function. We also find that the excitonic corrections enhance the optical response by a factor of 2 in the case of MoS2 in proximity to a cobalt thin film.

引用

页数：10

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