中国物理学会期刊网
物理学报  2017, Vol.66 Issue (16): 166301  DOI:10.7498/aps.66.166301
单层GaSe表面Fe原子吸附体系电子自旋性质调控
厦门大学物理系, 福建省半导体材料及应用重点实验室, 半导体光电材料及其高效转换器件协同创新中心, 厦门 361005
Modification of spin electronic properties of Fen/GaSe monolayer adsorption system
Fujian Provincial Key Laboratory of Semiconductors and Applications, Collaborative Innovation Center for Optoelectronic Semiconductors and Efficient Devices, Department of Physics, Xiamen University, Xiamen 361005, China

摘要

Ⅲ族金属单硫化物因其优越的光电和自旋电子特性而备受关注,实现对其自旋性质的有效调控是发展器件应用的关键.本文采用密度泛函理论系统地研究了GaSe表面Fe原子吸附体系的几何构型及自旋电子特性.Fe/GaSe体系中Fe吸附原子与最近邻Ga,Se原子存在较强的轨道耦合效应,使体系呈现100%自旋极化的半金属性.其自旋极化贡献主要来源于Fe-3d电子的转移及Fe-3d,Se-4p和Ga-4p轨道杂化效应.对于Fe双原子吸附体系,两Fe原子之间的自旋局域导致原本从Fe转移至GaSe的自旋极化电荷量减少,从而费米能级附近的单自旋通道转变为双自旋通道,费米能级处的自旋极化率转变为0.研究结果揭示了Fen/GaSe吸附体系自旋极化特性的形成和转变机制,可为未来二维自旋纳米器件的设计与构建提供参考.

Abstract

Group-ⅢA metal-monochalcogenides have been extensively studied due to their unique optoelectronic and spin electronic properties. To realize the device applications, modifying their magnetic properties is desirable. Atomic doping and vacancy defects have been proven to produce itinerant ferromagnetism and half-metallicity in GaSe monolayer. Relatively, the magnetic modification by adsorbing foreign atoms is rarely reported. Traditional ferromagnetic material, Fe element, possessing high electronic polarizability and high Curie temperature, becomes the best option of adsorbate. In this work, Fen(n=1, 2) atoms adsorbed GaSe monolayer systems are constructed, and the spin electronic properties are systematically studied through the density function theory. Based on the geometric configuration of fully relaxed 3×3 GaSe supercell, three highly symmetrical sites, i.e., the hollow site, the top site of Se atom, and the top site of Ga atom are inspected to search for the stable absorption positions of Fen atoms. Computation results of adsorption energies indicate that the top site of Ga atom is preferred for single Fe atom, and the hollow site near the first Fe adatom is the most stable site serving as adsorbing the second Fe atom. Based on the most stable configuration, the spin electronic properties are studied. For the single Fe adsorbed system, the valence band maximum moves to Γ point, resulting in a direct-band-gap. The strong orbit coupling effect between Fe adatom and its nearest Ga and Se atoms causes un-coincident majority and minority spin channels. Two impurity bands are located near the Fermi level and contribute only to the minority spin channel, producing a half-metallicity with a 100% spin polarization in the system. Bader charge analysis and spin-resolved partial density of states suggest that the spin polarization is mainly attributed to the transfer of Fe-3d electrons, and the hybridizations of Fe-3d, Se-4p, and Ga-4p states. Charge transfer from the Fe adatom to GaSe generates an n-type doping and an antiferromagnetic coupling between Fe and vicinal Ga and Se atoms. For the two-Fe-atoms adsorbed GaSe monolayer, the spin electronic states are found to be mainly located between the two Fe adatoms, leading to the reduction of the charge transfer from Fe to GaSe ML. As the original single spin channel turns into two spin channels (majority spin channel and minority spin channel) near the Fermi level, the ferromagnetic coupling between Fe atom and the vicinal Se atoms turn into antiferromagnetic coupling and the spin polarization falls to 0%. Therefore, the spin properties of GaSe monolayer can be controlled by modifying the number of adsorbed Fe atoms. These results reveal the formation and transform of the spin electronic properties of typical ferromagnetic/GaSe adsorption system, which offers some advice for designing and constructing the two-dimensional spin nanostructures.
收稿日期:2017-03-07

基金资助

国家自然科学基金(批准号:61674124,11304257,11604275,61227009)、国家重点基础研究发展计划(批准号:2016YFB0400801)、福建省自然科学基金(批准号:2014J01026,2016J01037,2015J01028)和厦门大学校长基金(批准号:20720160122,20720150033,20720160044)资助的课题.
Project supported by the National Natural Science Foundation of China (Grant Nos. 61674124, 11304257, 11604275, 61227009), the National Basic Research Program of China (Grant No. 2016YFB0400801), the Natural Science Foundation of Fujian Province, China (Grant Nos. 2014J01026, 2016J01037, 2015J01028), and the Fundamental Research Funds for the Central Universities, China (Grant Nos. 20720160122, 20720150033, 20720160044).

引用本文

[中文]
卢奕宏, 柯聪明, 付明明, 吴志明, 康俊勇, 张纯淼, 吴雅苹. 单层GaSe表面Fe原子吸附体系电子自旋性质调控[J]. 物理学报, 2017, 66(16): 166301.
[英文]
Lu Yi-Hong, Ke Cong-Ming, Fu Ming-Ming, Wu Zhi-Ming, Kang Jun-Yong, Zhang Chun-Miao, Wu Ya-Ping. Modification of spin electronic properties of Fen/GaSe monolayer adsorption system[J]. Acta Phys. Sin., 2017, 66(16): 166301.
使用本文
PACS
本文作者
阅读笔记
在左边选中内容后,点击→加入笔记。笔记内容将复制到下面文本框中,点击保存按钮可保存在个人文献中心中
              
[1]
Novoselov K S, Geim A K, Morozov S V, Jiang D, Zhang Y, Dubonos S V, Grigorieva I V, Firsov A A 2004 Science 306 666
[2]
Zhou S Y, Gweon G H, Fedorov A V, First P N, de Heer W A, Lee D H, Guinea F, Neto A H C, Lanzara A 2007 Nat. Mater. 6 770
[3]
Song L, Ci L J, Lu H, Sorokin P B, Jin C H, Kvashnin A G, Kvashnin D G, Lou J, Yakobson B I, Ajayan P M 2010 Nano Lett. 10 3209
[4]
Bianco E, Butler S, Jiang S S, Restrepo O D, Windl W, Goldberger J E 2013 ACS Nano 7 4414
[5]
Wu S F, Buckley S, Schaibley J R, Feng L F, Yan J Q, Mandrus D G, Hatami F, Yao W, Vuckovic J, Majumdar A, Xu X D 2015 Nature 520 69
[6]
Late D J, Liu B, Luo J J, Yan A M, Matte H S S R, Grayson M, Rao C N R, Dravid V P 2012 Adv. Mater. 24 3549
[7]
Hu P, Wang L, Yoon M, Zhang J, Feng W, Wang X, Wen Z, Idrobo J C, Miyamoto Y, Geohegan D B, Xiao K 2013 Nano Lett. 13 1649
[8]
Late D J, Liu B, Matte H S S R, Rao C N R, Dravid V P 2012 Adv. Fun. Mater. 22 1894
[9]
Hu P A, Wen Z Z, Wang L F, Tan P H, Xiao K 2012 ACS Nano 6 5988
[10]
Gamarts E M, Ivchenko E L, Karaman M I, Mushinski V P, Pikus G E, Razbirin B S, Starukhin A N 1977 Sov. Phys. JETP 46 590
[11]
Ivchenko E L, Pikus G E, Razbirin B S, Starukhin A I 1977 Sov. Phys. JETP 45 1172
[12]
Wei W, Dai Y, Liu C W, Ma Y D, Huang B B 2015 J. Mater. Chem. C 3 11548
[13]
Cao T, Li Z L, Louie S G 2015 Phys. Rev. Lett. 114 236602
[14]
Peng Y T, Xia C X, Zhang H, Wang T X, Wei S Y, Jia J 2014 Phys. Chem. Chem. Phys. 16 18799
[15]
Ao L, Xiao H Y, Xiang X, Li S, Liu K Z, Huang H, Zu X T 2015 Phys. Chem. Chem. Phys. 17 10737
[16]
Wang W G, Li M, Hageman S, Chien C L 2012 Nat. Mater. 11 64
[17]
Ikeda S, Miura K, Yamamoto H, Mizunuma K, Gan H D, Endo M, Kanai S, Hayakawa J, Matsukura F, Ohno H 2010 Nature Mater. 9 721
[18]
Maruyama T, Shiota Y, Nozaki T, Ohta K, Toda N, Mizuguchi M, Tulapurkar A A, Shinjo T, Shiraishi M, Mizukami S, Ando Y, Suzuki Y 2009 Nat. Nanotech. 4 158
[19]
Kresse G, Hafner J 1994 Phys. Rev. B:Condens. Matter Mater. Phys. 49 14251
[20]
Perdew J P, Burke K, Ernzerhof M 1996 Phys. Rev. Lett. 77 3865
[21]
Ma Y D, Dai Y, Guo M, Yu L, Huang B B 2013 Phys. Chem. Chem. Phys. 15 7098
[22]
Zhou J 2015 RSC Adv. 5 94679
[23]
Lu Y H, Ke C M, Fu M M, Lin W, Zhang C M, Chen T, Li H, Kang J Y, Wu Z M, Wu Y P 2017 RSC Adv. 7 4285
数据正在加载中...
中国物理学会期刊网