Kramers nodal lines in intercalated TaS2 superconductors
Kramers degeneracy is one fundamental embodiment of the quantum mechanical nature of particles with half-integer spin under time reversal symmetry. Under the chiral and noncentrosymmetric achiral crystalline symmetries, Kramers degeneracy emerges respectively as topological quasiparticles of Weyl fermions and Kramers nodal lines (KNLs), anchoring the Berry phase-related physics of electrons. However, an experimental demonstration for ideal KNLs well isolated at the Fermi level is lacking. Here, we establish a class of noncentrosymmetric achiral intercalated transition metal dichalcogenide superconductors with large Ising-type spin-orbit coupling, represented by In<sub>x</sub>TaS<sub>2</sub>, to host an ideal KNL phase. We provide evidence from angle-resolved photoemission spectroscopy with spin resolution, angle-dependent quantum oscillation measurements, and ab-initio calculations. Our work not only provides a realistic platform for realizing and tuning KNLs in layered materials, but also paves the way for exploring the interplay between KNLs and superconductivity, as well as applications pertaining to spintronics, valleytronics, and nonlinear transport.
Authors
- Ji Seop Oh (ORCID: https://orcid.org/0000-0002-6894-3983)
- Xiaofeng Guo (ORCID: https://orcid.org/0000-0002-2982-9248)
- Aki Pulkkinen (ORCID: https://orcid.org/0000-0002-4339-6928)
- Alex Moon
- Ziqin Yue (ORCID: https://orcid.org/0000-0003-3212-7113)
- Xue-Jian Gao
- Pavan Hosur (ORCID: https://orcid.org/0000-0002-7997-956X)
- J. Minář (ORCID: https://orcid.org/0000-0001-9735-8479)
- Sung‐Kwan Mo (ORCID: https://orcid.org/0000-0003-0711-8514)
- Dong-Hui Lu (ORCID: https://orcid.org/0000-0002-9708-0443)
- Mohamed Oudah (ORCID: https://orcid.org/0000-0001-7738-7571)
- R. J. Birgeneau
- E. Morosan (ORCID: https://orcid.org/0000-0002-6076-9204)
- E. Vescovo (ORCID: https://orcid.org/0000-0003-0350-3861)
- Yucheng Guo (ORCID: https://orcid.org/0000-0003-0372-1578)
- Alannah M. Hallas (ORCID: https://orcid.org/0000-0002-0892-0982)
- Alberto Marmodoro (ORCID: https://orcid.org/0000-0003-4174-9643)
- K. T. Law (ORCID: https://orcid.org/0000-0003-0501-6290)
- Luis Balicas (ORCID: https://orcid.org/0000-0002-5209-0293)
- Jianwei Huang (ORCID: https://orcid.org/0000-0002-5433-1513)
- Makoto Hashimoto (ORCID: https://orcid.org/0000-0003-1689-8997)
- Ming Yi (ORCID: https://orcid.org/0000-0001-8934-7905)
- Junichiro Kono (ORCID: https://orcid.org/0000-0002-4195-0577)
- А. В. Федоров (ORCID: https://orcid.org/0000-0003-3510-3117)
- Yichen Zhang (ORCID: https://orcid.org/0000-0001-6792-330X)
- Yuxiang Gao (ORCID: https://orcid.org/0000-0003-3893-3896)
- Anil Rajapitamahuni (ORCID: https://orcid.org/0000-0003-3092-4258)
Institutions
- Florida State University (US)
- Canadian Institute for Advanced Research (CA)
- University of British Columbia (CA)
- Lawrence Berkeley National Laboratory (US)
- Hong Kong University of Science and Technology (HK)
- Brookhaven National Laboratory (US)
- SLAC National Accelerator Laboratory (US)
- Stanford Synchrotron Radiation Lightsource (US)
- National High Magnetic Field Laboratory (US)
- University of Houston (US)
- Rice University (US)
- University of West Bohemia in Pilsen (CZ)
- University of California, Berkeley (US)
Publication Details
- Journal
- Nature Communications
- Published
- 2025-05-29
- DOI
- https://doi.org/10.1038/s41467-025-60020-z
- Citations
- 6
- Primary Topic
- 2D Materials and Applications
- Type
- article
- Field-Weighted Citation Impact
- 3.11
Funders
- National Science Foundation
- U.S. Department of Defense
- U.S. Department of Energy
- Gordon and Betty Moore Foundation
- Rice University
- National High Magnetic Field Laboratory
- Canada First Research Excellence Fund
- Office of Science
- U.S. Air Force
- Division of Materials Research
- Office of International Science and Engineering
- Basic Energy Sciences
- High Magnetic Field Laboratory, Chinese Academy of Sciences
- Brookhaven National Laboratory
- Lawrence Berkeley National Laboratory