- Physical Review Journals
All JournalsPhysics Magazine

Physical Review B

Export citation

Export citation

Choose format for download:

Download Citation
  • Letter

Spectroscopic evidence for Dirac nodal surfaces and nodal rings in the superconductor NaAlSi

Chunyao Song1,2,*, Lei Jin3,4,*, Pengbo Song1,2,*, Hongtao Rong1,2, Wenpei Zhu1,2, Bo Liang1,2, Shengtao Cui5, Zhe Sun5, Lin Zhao1,2,7 et al.

Youguo Shi1,2,7, Xiaoming Zhang3,4,†, Guodong Liu1,2,7,‡, and X. J. Zhou1,2,6,7,§

  • 1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
  • 2University of Chinese Academy of Sciences, Beijing 100049, China
  • 3State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology, Tianjin 300130, China
  • 4School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China
  • 5National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, China
  • 6Beijing Academy of Quantum Information Sciences, Beijing 100193, China
  • 7Songshan Lake Materials Laboratory, Dongguan 523808, China

  • *These authors contributed equally to this work.
  • †zhangxiaoming87@hebut.edu.cn
  • ‡gdliu_ARPES@iphy.ac.cn
  • §XJZhou@iphy.ac.cn
PDF

Phys. Rev. B 105, L161104 – Published 25 April, 2022

DOI: https://doi.org/10.1103/PhysRevB.105.L161104

Abstract

The discovery of the topological states has become a key topic in condensed matter physics with the focus evolving from the Dirac or Weyl points to high-dimensional topological states of the nodal lines and nodal surfaces. For a topological material to manifest its quantum properties and become useful in applications, the topological states need to be genuine and clean so that they lie close to the Fermi level without other trivial bands existing at the Fermi level. While a number of high-dimensional topological materials are predicted, only a few of them have been synthesized and confirmed and the genuine and clean ones are especially scarce. Here, we report the realization of genuine clean multiple high-dimensional topological states in NaAlSi. By performing high-resolution angle-resolved photoemission measurements and band-structure calculations, we have observed two sets of nodal surfaces and the formation of two homocentric nodal ring states in NaAlSi. The observed nodal rings are distinct in that the inner one is a type-I nodal ring while the outer one is a type-I nodal ring embedded with four type-III nodal points. All the bands involved in the nodal rings lie very close to the Fermi level with no other trivial bands coexisting at the Fermi level. These observations make NaAlSi a desirable topological material to explore for novel quantum states and exotic properties.

View figure in article

Physics Subject Headings (PhySH)

Authorization Required

We need you to provide your credentials before accessing this content.

Other Options

Supplemental Material (Subscription Required)

References (Subscription Required)

Outline

Information

Phys. Rev. B 105, L161104– Published 25 April, 2022
  • Received 25 February 2022
  • Accepted 5 April 2022
Crossmark - Check for updates button

©2022 American Physical Society

Sign In to Your Journals Account

Filter

Filter

Article Lookup

Enter a citation