{"title":"具有可调自旋和谷分裂特性的二维改磁双层膜中的自旋-层耦合","authors":"Yunxi Qi, Jun Zhao, Hui Zeng","doi":"10.1103/physrevb.110.014442","DOIUrl":null,"url":null,"abstract":"Recently, the discovery of collinear symmetric-compensated antiferromagnets (AFMs) with intrinsic spin splitting has attracted enormous interest of many researchers. In this paper, we predict the spin-layer coupling in altermagnetic bilayers with tunable spin and valley splitting properties via first-principles calculations. Based on the analysis of magnetic symmetry, we find manipulating magnetic order and stacking configuration as a strategy. Compared with conventional AFM bilayers, the joint symmetry in altermagnetic bilayer can be significantly modulated by different magnetic orders and stackings of the two sublayers. Furthermore, we demonstrate that the layer-dependent spin degeneracy/splitting widely exists in altermagnets with different crystal structures. The spin splitting in an altermagnetic bilayer with various interlayer couplings is highly tunable by external electric field. In contrast with spin splitting introduced by conventional spin-orbit coupling, the concepts of emerging layertronics and altermagnets are combined to manipulate spin properties by spin-layer coupling, ensuring both long spin relaxation time and complete spin splitting for practical applications of spintronic devices.","PeriodicalId":20082,"journal":{"name":"Physical Review B","volume":null,"pages":null},"PeriodicalIF":3.7000,"publicationDate":"2024-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Spin-layer coupling in two-dimensional altermagnetic bilayers with tunable spin and valley splitting properties\",\"authors\":\"Yunxi Qi, Jun Zhao, Hui Zeng\",\"doi\":\"10.1103/physrevb.110.014442\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"Recently, the discovery of collinear symmetric-compensated antiferromagnets (AFMs) with intrinsic spin splitting has attracted enormous interest of many researchers. In this paper, we predict the spin-layer coupling in altermagnetic bilayers with tunable spin and valley splitting properties via first-principles calculations. Based on the analysis of magnetic symmetry, we find manipulating magnetic order and stacking configuration as a strategy. Compared with conventional AFM bilayers, the joint symmetry in altermagnetic bilayer can be significantly modulated by different magnetic orders and stackings of the two sublayers. Furthermore, we demonstrate that the layer-dependent spin degeneracy/splitting widely exists in altermagnets with different crystal structures. The spin splitting in an altermagnetic bilayer with various interlayer couplings is highly tunable by external electric field. In contrast with spin splitting introduced by conventional spin-orbit coupling, the concepts of emerging layertronics and altermagnets are combined to manipulate spin properties by spin-layer coupling, ensuring both long spin relaxation time and complete spin splitting for practical applications of spintronic devices.\",\"PeriodicalId\":20082,\"journal\":{\"name\":\"Physical Review B\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":3.7000,\"publicationDate\":\"2024-07-29\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Physical Review B\",\"FirstCategoryId\":\"101\",\"ListUrlMain\":\"https://doi.org/10.1103/physrevb.110.014442\",\"RegionNum\":2,\"RegionCategory\":\"物理与天体物理\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"Physics and Astronomy\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Physical Review B","FirstCategoryId":"101","ListUrlMain":"https://doi.org/10.1103/physrevb.110.014442","RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"Physics and Astronomy","Score":null,"Total":0}
Spin-layer coupling in two-dimensional altermagnetic bilayers with tunable spin and valley splitting properties
Recently, the discovery of collinear symmetric-compensated antiferromagnets (AFMs) with intrinsic spin splitting has attracted enormous interest of many researchers. In this paper, we predict the spin-layer coupling in altermagnetic bilayers with tunable spin and valley splitting properties via first-principles calculations. Based on the analysis of magnetic symmetry, we find manipulating magnetic order and stacking configuration as a strategy. Compared with conventional AFM bilayers, the joint symmetry in altermagnetic bilayer can be significantly modulated by different magnetic orders and stackings of the two sublayers. Furthermore, we demonstrate that the layer-dependent spin degeneracy/splitting widely exists in altermagnets with different crystal structures. The spin splitting in an altermagnetic bilayer with various interlayer couplings is highly tunable by external electric field. In contrast with spin splitting introduced by conventional spin-orbit coupling, the concepts of emerging layertronics and altermagnets are combined to manipulate spin properties by spin-layer coupling, ensuring both long spin relaxation time and complete spin splitting for practical applications of spintronic devices.
期刊介绍:
Physical Review B (PRB) is the world’s largest dedicated physics journal, publishing approximately 100 new, high-quality papers each week. The most highly cited journal in condensed matter physics, PRB provides outstanding depth and breadth of coverage, combined with unrivaled context and background for ongoing research by scientists worldwide.
PRB covers the full range of condensed matter, materials physics, and related subfields, including:
-Structure and phase transitions
-Ferroelectrics and multiferroics
-Disordered systems and alloys
-Magnetism
-Superconductivity
-Electronic structure, photonics, and metamaterials
-Semiconductors and mesoscopic systems
-Surfaces, nanoscience, and two-dimensional materials
-Topological states of matter