Magnetotransport and ab initio calculation studies on the layered semimetal CaAl2Si2 hosting multiple nontrivial topological states

doi:10.1103/PhysRevB.101.205138

	Magnetotransport and ab initio calculation studies on the layered semimetal CaAl2Si2 hosting multiple nontrivial topological states
	Su, Hao1,2,3 ; Shi, Xianbiao 4,5,6; Xia, Wei1,2,3 ; Wang, Hongyuan1,2,3 ; Hanli, Xuesong1 ; Yu, Zhenhai1 ; Wang, Xia1,7 ; Zou, Zhiqiang1,7 ; Yu, Na1,7 ; Zhao, Weiwei 4,5,6; Xu, Gang 8,9; Guo, Yanfeng1,10
	2020-05-21
发表期刊	PHYSICAL REVIEW B (IF:3.2[JCR-2023],3.3[5-Year])
ISSN	2469-9950
EISSN	2469-9969
卷号	101 期号:20
发表状态	已发表
DOI	10.1103/PhysRevB.101.205138
摘要	We report herein the results of magnetotransport measurements and ab initio calculations on single crystalline CaAl2Si2 semimetal. The transport properties could be understood in connection with the two-band model, agreeing well with the theoretical calculations indicating four main sheets of Fermi surface consisting of three hole pockets centered at the Gamma point and one electron pocket centered at the M point in the Brillouin zone. Magnetotransport measurements showed striking Shubnikov-de Haas oscillations associated with a nontrivial Berry phase, which originate from a hole Fermi pocket indicated by the ab initio calculations. The calculations also unveiled that the hole Fermi surface encloses a nodal line setting around the Gamma point close to the Fermi level without considering the spin-orbit coupling (SOC). Once the SOC is included, the fragile nodal-line will be gapped and a pair of Dirac points emerge along the high symmetric Gamma-A direction located at the Brillouin zone coordinates (0, 0, k(z)(D) approximate to +/- 0.278 x 2 pi/c), about 1.22 eV below the Fermi level. In addition, the SOC can also induce a topological insulator state along the Gamma-A direction with a gap of about 3 meV. The results demonstrate CaAl2Si2 as an excellent platform for the study of novel topological physics with multiple nontrivial topological states.
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收录类别	SCI ; SCIE ; EI
语种	英语
资助项目	Natural Science Foundation of Shanghai[17ZR1443300] ; National Natural Science Foundation of China[11874264][11874022] ; Chinese Academy of Sciences[XDA18000000] ; Shenzhen Peacock Team Plan[KQTD20170809110344233] ; Bureau of Industry and Information Technology of Shenzhen through the Graphene Manufacturing Innovation Center[201901161514] ; National Key Research and Development Program of China[2018YFA0307000] ; Analytical Instrumentation Center, SPST, ShanghaiTech University[SPST-AIC10112914]
WOS研究方向	Materials Science ; Physics
WOS类目	Materials Science, Multidisciplinary ; Physics, Applied ; Physics, Condensed Matter
WOS记录号	WOS:000534427900003
出版者	AMER PHYSICAL SOC
EI入藏号	20202308792974
EI主题词	Aluminum compounds ; Calcium compounds ; Fermi level ; Fermi surface ; Silicon ; Silicon compounds ; Spin orbit coupling ; Topological insulators ; Topology
EI分类号	Nonferrous Metals and Alloys excluding Alkali and Alkaline Earth Metals:549.3 ; Mathematics:921 ; Combinatorial Mathematics, Includes Graph Theory, Set Theory:921.4 ; Atomic and Molecular Physics:931.3
WOS关键词	TOTAL-ENERGY CALCULATIONS ; DIRAC SEMIMETAL ; DISCOVERY
原始文献类型	Article
引用统计	正在获取...
文献类型	期刊论文
条目标识符	https://kms.shanghaitech.edu.cn/handle/2MSLDSTB/121138
专题	物质科学与技术学院_博士生物质科学与技术学院_PI研究组_郭艳峰组物质科学与技术学院_公共科研平台_分析测试平台物质科学与技术学院_硕士生
通讯作者	Su, Hao; Zhao, Weiwei
作者单位	1.ShanghaiTech Univ, Sch Phys Sci & Technol, Shanghai 201210, Peoples R China 2.Chinese Acad Sci, Shanghai Inst Opt & Fine Mech, Shanghai 201800, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 4.Harbin Inst Technol, State Key Lab Adv Welding & Joining, Shenzhen 518055, Peoples R China 5.Harbin Inst Technol, Flexible Printed Elect Technol Ctr, Shenzhen 518055, Peoples R China 6.Harbin Inst Technol, Key Lab Microsyst & Microstruct Mfg, Minist Educ, Harbin 150001, Peoples R China 7.ShanghaiTech Univ, Analyt Instrumentat Ctr, Sch Phys Sci & Technol, Shanghai 201210, Peoples R China 8.Huazhong Univ Sci & Technol, Wuhan Natl High Magnet Field Ctr, Wuhan 430074, Peoples R China 9.Huazhong Univ Sci & Technol, Sch Phys, Wuhan 430074, Peoples R China 10.Chinese Acad Sci, CAS Ctr Excellence Superconducting Elect CENSE, Shanghai 200050, Peoples R China
第一作者单位	物质科学与技术学院
通讯作者单位	物质科学与技术学院
第一作者的第一单位	物质科学与技术学院
推荐引用方式 GB/T 7714	Su, Hao,Shi, Xianbiao,Xia, Wei,et al. Magnetotransport and ab initio calculation studies on the layered semimetal CaAl2Si2 hosting multiple nontrivial topological states[J]. PHYSICAL REVIEW B,2020,101(20).
APA	Su, Hao.,Shi, Xianbiao.,Xia, Wei.,Wang, Hongyuan.,Hanli, Xuesong.,...&Guo, Yanfeng.(2020).Magnetotransport and ab initio calculation studies on the layered semimetal CaAl2Si2 hosting multiple nontrivial topological states.PHYSICAL REVIEW B,101(20).
MLA	Su, Hao,et al."Magnetotransport and ab initio calculation studies on the layered semimetal CaAl2Si2 hosting multiple nontrivial topological states".PHYSICAL REVIEW B 101.20(2020).