Ferroelectric Controlled Spin Texture in Two-Dimensional NbOI$_{2}$ Monolayer
Qian Ye1† , Yu-Hao Shen1† , and Chun-Gang Duan1,2*
1 State Key Laboratory of Precision Spectroscopy and Key Laboratory of Polar Materials and Devices (Ministry of Education), Department of Electronics, East China Normal University, Shanghai 200241, China2 Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China
Abstract ：The persistent spin helix (PSH) system is considered to have promising applications in energy-conservation spintronics because it supports an extraordinarily long spin lifetime of carriers. Here, we predict that the existence of PSH state in two-dimensional (2D) ferroelectric NbOI$_{2}$ monolayers. Our first-principles calculation results show that there exists Dresselhaus-type spin-orbit coupling (SOC) band splitting near the conduction-band minimum (CBM) of the NbOI$_{2}$ monolayer. It is revealed that the spin splitting near CBM merely refers to out-of-plane spin configuration in the wave vector space, which gives rise to a long-lived PSH state that can be controlled by reversible ferroelectric polarization. We believe that the coupling characteristics of ferroelectric polarization and spin texture in NbOI$_{2}$ provide a platform for the realization of fully electric controlled spintronic devices.
收稿日期: 2021-04-23
出版日期: 2021-08-02
:
77.80.-e
(Ferroelectricity and antiferroelectricity)
77.84.-s
(Dielectric, piezoelectric, ferroelectric, and antiferroelectric materials)
85.75.-d
(Magnetoelectronics; spintronics: devices exploiting spin polarized transport or integrated magnetic fields)
75.70.Tj
(Spin-orbit effects)
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2021, Vol. 38 
