物理学报2024，Vol.73Issue(1)：186-196,11.DOI:10.7498/aps.73.20231279
碳和氧掺杂紫磷烯作为双极磁性半导体材料的理论预测
Theoretical prediction of C-and O-doped Hittorf's violet phosphorene as bipolar magnetic semiconductor material
摘要
Abstract
Hittorf's violet phosphorene is a novel two-dimensional material with stable structure and excellent optoelectronic properties.Studying the doping effect helps to understand its physical essence and is of great significance in further developing nanoelectronic devices.In this paper,the first-principles method based on density functional theory is used to study the electromagnetic properties of the non-metallic element B-,C-,N-,and O-doped single-layer violet phosphene.The results show that there is no magnetism after having doped boron and nitrogen,and the system still behaves as a nonmagnetic semiconductor,while carbon doping and oxygen doping cause spin splitting,and the violet phosphorene transforms from a nonmagnetic semiconductor to a bipolar magnetic semiconductor,and its spin density is mainly distributed in the P atom and gap region,rather than on the impurity.The direction of spin polarization of its carrier can be reversed by adjusting the electric field of O-doped violet phosphorene.When a certain size of forward or reverse electrostatic field is applied,the band dispersion becomes stronger,and the O-doped violet phosphorene transforms into a half-metallic magnet with 100%downward or upward spin polarization at the Fermi level.The field effect spin filter based on O-doped violet phosphorene can reverse the direction of spin-polarized current by changing the direction of the gate voltage.This study shows that O-doped violet phosphorene is expected to be an ideal candidate material for two-dimensional spin field-effect transistors,bipolar magnetic spintronic devices,dual channel field effect spin filters,and field-effect spin valves.关键词
紫磷烯/掺杂/双极磁性半导体/单自旋半金属磁体Key words
violet phosphorene/doping/bipolar magnetic semiconductor/half-metallic magnet引用本文复制引用
卢一林,董盛杰,崔方超,张开成,刘春梅,李杰森,毛卓..碳和氧掺杂紫磷烯作为双极磁性半导体材料的理论预测[J].物理学报,2024,73(1):186-196,11.基金项目
辽宁省教育厅基本科研项目(批准号:LJKQZ20222272)和渤海大学海洋研究院开放课题(批准号:BDHYYJY2023015)资助的课题.Project supported by the Scientific Research Fund of the Education Department of Liaoning Province,China(Grant No.LJKQZ20222272)and the Open Project of the Institute of Ocean Research,Bohai University,China.(Grant No.BDHYYJY2023015). （批准号:LJKQZ20222272）
