Bulletin of the American Physical Society
2023 APS March Meeting
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session Q23: Electronic Structure of Topological Materials (photoemission, etc.)-II
3:00 PM–5:48 PM,
Wednesday, March 8, 2023
Room: Room 215
Sponsoring
Unit:
DCMP
Chair: Madhab Neupane, University of Central Florida
Abstract: Q23.00006 : Observation of Weyl fermion states in 2D ferromagnetic electride Gd2C via angle-resolved photoemission spectroscopy
4:00 PM–4:12 PM
Presenter:
Chan-young Lim
(Korea Advanced Institute of Science and Technology)
Authors:
Chan-young Lim
(Korea Advanced Institute of Science and Technology)
Sunghun Kim
(Korea Advanced Institute of Science and Technology)
Yeonghoon Lee
(Korea Research Institute of Standards and Science)
Jaehun Cha
(Korea Advanced Institute of Science and Technology)
Gyubin Lee
(Korea Advanced Institute of Science and Technology)
Dinesh Thapa
(North Dakota State University)
Jonathan D Denlinger
(Lawrence Berkeley National Laboratory)
Seong-Gon Kim
(Mississippi State University)
Sung Wng Kim
(Sungkyunkwan University)
Yeongkwan Kim
(Korea Advanced Institute of Science and Technology)
In this talk, we will report the observation of Weyl fermions in Gd2C electronic structure captured with angle-resolved photoemission spectroscopy (ARPES). Weyl cones and Fermi arc states – key features of Weyl fermion state – are revealed with photon energy dependent ARPES measurements. Our calculation indicates that the Fermi arc surface state in Gd2C mainly confined on the topmost Gd atomic layer. Still, there is a finite overlap between surface IAEs and the topmost Gd atoms, which could provide clues to topological states with IAEs – the electrons that are not bounded to the atomic orbital directly.
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