Valley-driven orbital polarization induced by a magnetic impurity in monolayer NbSe2

被引：0

作者：

Chauhan, Amit ^{[1
,2
]}

Gupta, Mayank ^{[1
,2
]}

Gautam, Tapesh ^{[1
,3
]}

Nanda, B. R. K. ^{[1
,2
]}

Satpathy, S. ^{[1
,2
,3
]}

机构：

[1] IIT Madras, Dept Phys, Condensed Matter Theory & Computat Lab, Chennai 600036, India

[2] IIT Madras, Ctr Atomist Modelling & Mat Design, Chennai 600036, India

[3] Univ Missouri, Dept Phys & Astron, Columbia, MO 65211 USA

来源：

PHYSICAL REVIEW B | 2024年 / 110卷 / 04期

关键词：

Density functional theory - Landforms - Monolayers - Niobium compounds - Scanning tunneling microscopy - Spin polarization - Transition metals;

D O I：

10.1103/PhysRevB.110.L041119

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Due to the coupled spin-valley physics, monolayer 2D transition metal dichalcogenides (TMDs) show many unusual electronic and transport properties. Here, we show that a magnetic impurity in the metallic TMDs such as the 2H-NbSe2 induces a large orbital polarization in its neighborhood with a Friedel type oscillation, in addition to the usual spin polarization. We study the orbital polarization, hitherto unexplored for any impurity system, using the impurity Green's function approach as well as tight-binding and density functional methods. Concrete results are presented for the Mn substitutional impurity in NbSe2 from density-functional calculations. The orbital polarization here is due to the orbital moment imbalance between the K/K' valleys, which is driven by the impurity-induced spin imbalance. Our work demonstrates the Friedel oscillation for the first time in the orbital channel. Our results should be readily accessible for experimental study using techniques such as the spin polarized scanning tunneling microscopy.

引用

页数：6