Tunable exciton states and optical properties of magnetic nanoribbons

Tunable exciton states and optical properties of magnetic nanoribbons

Hong Tang, Bimal Neupane, Santosh Neupane, and Adrienn Ruzsinszky

Department of Physics, Temple University, Philadelphia, PA 19122

Layered transition metal halides (TMH), such as CrX3 (X=Cl, Br or I), have amazing magnetic properties even with the thickness reduced down to a monolayer [1]. It has been shown that the giant magneto-optical response is dominated by the excitonic effects in the CrI3 monolayer [2]. With nanoribbons cut from monolayer transition metal dichalcogenide, the reduced spin-orbit coupling influences the characteristic of formatted exciton states [3]. We use first-principles GW and Bethe-Salpeter equation calculations to investigate the excitonic states of magnetic nanoribbons. We show how the edge states re-shape the bound excitons and how this leads to dramatic change of the optical properties of these magnetic nanoribbons, which may have important applications in magneto-optical and optoelectronic devices.

Work is supported by the DOE-BES DE-SC0021263.

[1]. Bevin Huang, Genevieve Clark, Efrén Navarro-Moratalla, et al. Nature,546, 270, 2017.

[2]. Meng Wu 1,2, Zhenglu Li 1,2, Ting Cao 1,2 & Steven G. Louie, Nature communications, (2019) 10:2371.

[3]. Hong Tang, Bimal Neupane, Santosh Neupane, Shiqi Ruan, Niraj K. Nepal, Adrienn Ruzsinszky, arXiv:2109.04551