摘要
Tuning of the magnetic interaction plays the vital role in reducing the clustering of magnetic dopant in diluted magnetic semiconductors(DMS).Due to the not well understood magnetic mechanism and the interplay between different magnetic mechanisms,no efficient and universal tuning strategy is proposed at present.Here,the magnetic interactions and formation energies of isovalent-doped(Mn) and aliovalent(Cr)-doped LiZnAs are studied based on density functional theory(DFT).It is found that the dopant–dopant distance-dependent magnetic interaction is highly sensitive to the carrier concentration and carrier type and can only be explained by the interplay between two magnetic mechanisms,i.e.,superexchange and Zener’s p–d exchange model.Thus,the magnetic behavior and clustering of magnetic dopant can be tuned by the interplay between two magnetic mechanisms.The insensitivity of the tuning effect to U parameter suggests that our strategy could be universal to other DMS.
作者
贾子航
周波
姜振益
张小东
Zihang Jia;Bo Zhou;Zhenyi Jiang;Xiaodong Zhang(Institute of Modern Physics,Northwest University,Xi'an 710069,China;Shaanxi Key Laboratory for Theoretical Physics Frontiers,Northwest University,Xi'an 710069,China;Department of Physics,Chinese University of Hong Kong,Hong Kong SAR,China;Beijing Computational Science Research Center,Beijing 100193,China)
基金
Project supported by the Natural Science Foundation of Shaanxi Province of China(Grant No.2013JQ1018)
the Natural Science Foundation of Department of Education of Shaanxi Province of China(Grant No.15JK1759)
the Double First-class University Construction Project of Northwest University
the financial support of Chinese University of Hong Kong(CUHK)(Grant No.4053084)
University Grants Committee of Hong Kong,China(Grant No.24300814)
start-up funding of CUHK。
作者简介
Corresponding author:Bo Zhou,E-mail:zhoubo@nwu.edu.cn;Corresponding author:Zhenyi Jiang,E-mail:jiangzhenyi@nwu.edu.cn;Corresponding author:Xiaodong Zhang,E-mail:zhangxiaodong@nwu.edu.cn。
