Bulletin of the American Physical Society
APS March Meeting 2020
Volume 65, Number 1
Monday–Friday, March 2–6, 2020; Denver, Colorado
Session J55: Photoemission Studies of Topological Materials
2:30 PM–5:06 PM,
Tuesday, March 3, 2020
Room: Mile High Ballroom 2B
Sponsoring
Unit:
DCMP
Chair: Michael Osofsky, United States Naval Research Laboratory
Abstract: J55.00008 : Electronic Structure of Topological Material CaMnSb2
Abstract 
Presenter:
Hongtao Rong
(Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences)
Authors:
Hongtao Rong
(Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences)
Junbao He
(Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences)
Yongqing Cai
(Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences)
Guodong Liu
(Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences)
Lin Zhao
(Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences)
Zuyan Xu
(Technical Institute of Physics and Chemistry, Chinese Academy of Sciences)
Xingjiang Zhou
(Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences)
AMnPn2 (A = Ca, Sr, Ba, Eu, Yb; Pn = Sb, Bi) compounds are new kind of topological materials. Theoretical studies indicate that AMnPn2 host an anisotropic Dirac cone near the Fermi surface. Here we report our high-resolution laser-based angle-resolved photoemission measurements on the electronic structure of CaMnSb2. The Fermi surface of CaMnSb2 mainly consists of one hole pocket around the Brillouin zone center and two tiny hole pockets at the Brillouin zone boundary which are consistent with the first principle calculations. In addition, we observe four additional points located at the hole pocket around the Brillouin zone center along the high symmetry directions which is hard to be accounted for by band structure calculations.
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