Scholarlink

<p>The quasi-one-dimensional charge density wave (CDW) material (TaSe<sub>4</sub>)<sub>2</sub>I has been recently predicted to host Kramers-Weyl (KW) fermions which should exist in the vicinity of high symmetry points in the Brillouin zone in chiral materials with strong spin-orbit coupling. However, direct spectroscopic evidence of KW fermions is limited. Here we use helicity-dependent laser-based angle-resolved photoemission spectroscopy (ARPES) in conjunction with tight-binding and first-principles calculations to identify KW fermions in (TaSe<sub>4</sub>)<sub>2</sub>I. We find that topological and symmetry considerations place distinct constraints on the (pseudo-) spin texture and the observed spectra around a KW node. Our findings highlight the unique topological nature of (TaSe<sub>4</sub>)<sub>2</sub>I and provide a pathway for identifying KW fermions in other chiral materials.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Signatures of Kramers-Weyl fermions in the charge density wave material (TaSe4)2I

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年10月20日

查看全文
  • Soyeun Kim,
  • Robert C. McKay,
  • Nina Bielinski,
  • Junehu Park,
  • Chengxi Zhao,
  • Meng-Kai Lin,
  • Joseph A. Hlevyack,
  • Xuefei Guo,
  • Sung-Kwan Mo,
  • Peter Abbamonte,
  • T.-C. Chiang,
  • André Schleife,
  • Daniel P. Shoemaker,
  • Barry Bradlyn,
  • Fahad Mahmood

摘要

The quasi-one-dimensional charge density wave (CDW) material (TaSe4)2I has been recently predicted to host Kramers-Weyl (KW) fermions which should exist in the vicinity of high symmetry points in the Brillouin zone in chiral materials with strong spin-orbit coupling. However, direct spectroscopic evidence of KW fermions is limited. Here we use helicity-dependent laser-based angle-resolved photoemission spectroscopy (ARPES) in conjunction with tight-binding and first-principles calculations to identify KW fermions in (TaSe4)2I. We find that topological and symmetry considerations place distinct constraints on the (pseudo-) spin texture and the observed spectra around a KW node. Our findings highlight the unique topological nature of (TaSe4)2I and provide a pathway for identifying KW fermions in other chiral materials.