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Kramers nodal lines in intercalated TaS2 superconductors

Journal Article · · Nature Communications
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  1. Rice Univ., Houston, TX (United States)
  2. University of West Bohemia, Pilsen (Czech Republic)
  3. Hong Kong University of Science and Technology (HKUST) (Hong Kong)
  4. Rice Univ., Houston, TX (United States); Univ. of California, Berkeley, CA (United States)
  5. Florida State Univ., Tallahassee, FL (United States)
  6. Univ. of British Columbia, Vancouver, BC (Canada)
  7. Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
  8. SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)
  9. Brookhaven National Laboratory (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
  10. Univ. of British Columbia, Vancouver, BC (Canada); Canadian Institute for Advanced Research (CIFAR), Toronto, ON (Canada)
  11. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
  12. Univ. of Houston, TX (United States)
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.
Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States); Florida State University, Tallahassee, FL (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
Air Force Office of Scientific Research (AFOSR); Gordon and Betty Moore Foundation (GBMF); Gordon and Betty Moore Foundation’s EPiQS Initiative; Hong Kong Research Grant Council; Hong Kong Research Grant Council (RGC); National Science Foundation (NSF); Robert A. Welch Foundation; US Air Force Office of Scientific Research (AFOSR); US Department of Energy; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22), Scientific User Facilities Division (SC-22.3 ); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
Grant/Contract Number:
AC02-05CH11231; AC02-76SF00515; SC0002613; SC0012704
OSTI ID:
2570559
Alternate ID(s):
OSTI ID: 2574332
OSTI ID: 2571824
Report Number(s):
BNL--228355-2025-JAAM
Journal Information:
Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 16; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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