Kramers nodal lines in intercalated TaS2 superconductors

Yichen Zhang, Yuxiang Gao, Aki Pulkkinen, Xingyao Guo, Jianwei Huang, Yucheng Guo, Ziqin Yue, Ji Seop Oh, Alex Moon, Mohamed Oudah, Xue-Jian Gao, Alberto Marmodoro, Alexei Fedorov, Sung-Kwan Mo, Makoto Hashimoto, Donghui Lu, Anil Rajapitamahuni, Elio Vescovo, Junichiro Kono, Alannah M. Hallas, Robert J. Birgeneau, Luis Balicas, Ján Minár, Pavan Hosur, Kam Tuen Law, Emilia Morosan () and Ming Yi ()
Additional contact information
Yichen Zhang: Rice University
Yuxiang Gao: Rice University
Aki Pulkkinen: University of West Bohemia
Xingyao Guo: Hong Kong University of Science and Technology, Clear Water Bay
Jianwei Huang: Rice University
Yucheng Guo: Rice University
Ziqin Yue: Rice University
Ji Seop Oh: Rice University
Alex Moon: Tallahassee
Mohamed Oudah: University of British Columbia, Vancouver
Xue-Jian Gao: Hong Kong University of Science and Technology, Clear Water Bay
Alberto Marmodoro: University of West Bohemia
Alexei Fedorov: Lawrence Berkeley National Laboratory, Berkeley
Sung-Kwan Mo: Lawrence Berkeley National Laboratory, Berkeley
Makoto Hashimoto: SLAC National Accelerator Laboratory
Donghui Lu: SLAC National Accelerator Laboratory
Anil Rajapitamahuni: Brookhaven National Lab
Elio Vescovo: Brookhaven National Lab
Junichiro Kono: Rice University
Alannah M. Hallas: University of British Columbia, Vancouver
Robert J. Birgeneau: University of California, Berkeley
Luis Balicas: Tallahassee
Ján Minár: University of West Bohemia
Pavan Hosur: University of Houston
Kam Tuen Law: Hong Kong University of Science and Technology, Clear Water Bay
Emilia Morosan: Rice University
Ming Yi: Rice University

Nature Communications, 2025, vol. 16, issue 1, 1-10

Abstract: Abstract 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 InxTaS2, 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.

Date: 2025
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DOI: 10.1038/s41467-025-60020-z

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