Electronic structure in a transition metal dipnictide TaAs2

被引:1
作者
Regmi, Sabin [1 ,2 ]
Huang, Cheng-Yi [3 ]
Khan, Mojammel A. [4 ]
Wang, Baokai [3 ]
Sakhya, Anup Pradhan [1 ]
Hosen, M. Mofazzel [1 ]
Thompson, Jesse [1 ]
Singh, Bahadur [5 ]
Denlinger, Jonathan D. [6 ]
Ishigami, Masahiro [1 ]
Mitchell, J. F. [4 ]
Kaczorowski, Dariusz [7 ]
Bansil, Arun [3 ]
Neupane, Madhab [1 ]
机构
[1] Univ Cent Florida, Dept Phys, Orlando, FL 32816 USA
[2] Idaho Natl Lab, Idaho Falls, ID 83415 USA
[3] Northeastern Univ, Dept Phys, Boston, MA 02115 USA
[4] Argonne Natl Lab, Mat Sci Div, Lemont, IL 60439 USA
[5] Tata Inst Fundamental Res, Dept Condensed Matter Phys & Mat Sci, Mumbai 400005, India
[6] Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA
[7] Polish Acad Sci, Inst Low Temp & Struct Res, Okolna 2, PL-50422 Wroclaw, Poland
基金
美国国家科学基金会;
关键词
angle-resolved photoemission spectroscopy; electronic structure; transition metal dipnictide; extreme magnetoresistance; TOPOLOGICAL CRYSTALLINE INSULATOR; TOTAL-ENERGY CALCULATIONS; SINGLE DIRAC CONE; EXPERIMENTAL REALIZATION; MAGNETORESISTANCE;
D O I
10.1088/1361-648X/ad04fc
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
The family of transition-metal dipnictides has been of theoretical and experimental interest because this family hosts topological states and extremely large magnetoresistance (MR). Recently, TaAs2 , a member of this family, has been predicted to support a topological crystalline insulating state. Here, by using high-resolution angle-resolved photoemission spectroscopy (ARPES), we reveal both closed and open pockets in the metallic Fermi surface (FS) and linearly dispersive bands on the ( 201 ) surface, along with the presence of extreme MR observed from magneto-transport measurements. A comparison of the ARPES results with first-principles computations shows that the linearly dispersive bands on the measured surface of TaAs2 are trivial bulk bands. The absence of symmetry-protected surface state on the ( 201 ) surface indicates its topologically dark nature. The presence of open FS features suggests that the open-orbit fermiology could contribute to the extremely large MR of TaAs2 .
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页数:7
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