TY - JOUR
T1 - Multiple topologically nontrivial bands in noncentrosymmetric YSn2
AU - Zhu, Yanglin
AU - Zhang, Tiantian
AU - Hu, Jin
AU - Kidd, Jamin
AU - Graf, David
AU - Gui, Xin
AU - Xie, Weiwei
AU - Zhu, Mengze
AU - Ke, Xianglin
AU - Cao, Huibo
AU - Fang, Zhong
AU - Weng, Hongming
AU - Mao, Zhiqiang
N1 - Funding Information:
This work was supported by the US Department of Energy (DOE) under Grant No. DE-SC0014208. A portion of this work was performed at the National High Magnetic Field Laboratory, which is supported by National Science Foundation Cooperative Agreement No. DMR-1157490 and the State of Florida. The band structure calculation work was supported by the National Key Research and Development Program of China (Grant No. 2016YFA0300600), the National Natural Science Foundation of China (Grant No. 11674369), and the “Strategic Priority Research Program (B)” of the Chinese Academy of Sciences (Grant No. XDB07020100).
Publisher Copyright:
© 2018 American Physical Society.
PY - 2018/7/16
Y1 - 2018/7/16
N2 - The square lattices formed by main-group elements such as Bi, Sb, Sn, and Si in layered materials have attracted a lot of interest, since they can create rich topological phases. In this paper, we report the slightly distorted square lattice of Sn in a noncentrosymmetric compound YSn2 generates multiple topologically nontrivial bands, one of which likely hosts a nodal line and tunable Weyl semimetal state induced by the Rashba spin-orbit coupling and proper external magnetic field. The quasiparticles described as relativistic fermions from these bands are manifested by nearly zero mass and nontrivial Berry phases probed in de Haas-van Alphen (dHvA) oscillations. The dHvA study also reveals YSn2 has a complicated Fermi surface, consisting of several three-dimensional (3D) and one 2D pocket. Our first-principles calculations show the pointlike 3D pocket at Y point on the Brillouin zone boundary hosts the possible Weyl state. Our findings establish YSn2 as a new interesting platform for observing novel topological phases and studying their underlying physics.
AB - The square lattices formed by main-group elements such as Bi, Sb, Sn, and Si in layered materials have attracted a lot of interest, since they can create rich topological phases. In this paper, we report the slightly distorted square lattice of Sn in a noncentrosymmetric compound YSn2 generates multiple topologically nontrivial bands, one of which likely hosts a nodal line and tunable Weyl semimetal state induced by the Rashba spin-orbit coupling and proper external magnetic field. The quasiparticles described as relativistic fermions from these bands are manifested by nearly zero mass and nontrivial Berry phases probed in de Haas-van Alphen (dHvA) oscillations. The dHvA study also reveals YSn2 has a complicated Fermi surface, consisting of several three-dimensional (3D) and one 2D pocket. Our first-principles calculations show the pointlike 3D pocket at Y point on the Brillouin zone boundary hosts the possible Weyl state. Our findings establish YSn2 as a new interesting platform for observing novel topological phases and studying their underlying physics.
UR - http://www.scopus.com/inward/record.url?scp=85050374889&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85050374889&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.98.035117
DO - 10.1103/PhysRevB.98.035117
M3 - Article
AN - SCOPUS:85050374889
SN - 0163-1829
VL - 98
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
IS - 3
M1 - 035117
ER -