Journal Article

Observation of nodal line in non-symmorphic topological semimetal InBi

Wu, Shu-Chun, Jiang, Juan, Okawa, Kenjiro, Mo, Sung-Kwan, Sasagawa, Takao, Liu, Zhongkai, Hwang, Chan-Cuk, Ekahana, Sandy Adhitia, Felser, Claudia, Yan, Binghai, Prabhakaran, Dharmalingam, Chen, Yulin

2017

Overview

Topological nodal semimetal (TNS), characterized by its touching conduction and valence bands, is a newly discovered state of quantum matter which exhibits various exotic physical phenomena. Recently, a new type of TNS called topological nodal line semimetal (TNLS) is predicted where its conduction and valence band form a degenerate one-dimension line which is further protected by its crystal symmetry. In this work, we systematically investigated the bulk and surface electronic structure of the non-symmorphic, TNLS in InBi (which is also a type II Dirac semimetal) with strong spin-orbit coupling by using angle resolved photoemission spectroscopy. By tracking the crossing points of the bulk bands at the Brillouin zone boundary, we discovered the nodal-line feature along the k z direction, in agreement with the ab initio calculations and confirmed it to be a new compound in the TNLS family. Our discovery provides a new material platform for the study of these exotic topological quantum phases and paves the way for possible future applications.

• Publisher: IOP Publishing
• Subject: Brillouin zones / CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY / Conduction bands / Electronic structure / nodal line semimetal / Photoelectric emission / Physics / Spin-orbit interactions / topological material / topological semimetal / Topology / Valence band