SKM 2023 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 59: Poster Session: Topology
TT 59.12: Poster
Donnerstag, 30. März 2023, 15:00–18:00, P2/OG4
Electronic structure of topological superconductor candidate Li2Pd3B — •Gabriele Domaine1, Jonas A. Krieger1, Wei Yao1, Changjiang Yi2, Claudia Felser2, Stuart S. P. Parkin1, and Niels B. M. Schröter1 — 1Max Planck Institute for Microstructure Physics, Halle, Germany — 2Max Planck Institute for Chemical Physics of Solids, Dresden, Germany
Chiral crystals are known to host a number of exotic quasiparticles which carry large Chern numbers and, as they are unconstrained from the celebrated spin statistics connection, can exhibit a range of unconventional (effective) spins [1]. These include, for instance, spin 3/2 Rarita-Schwinger, Kramers-Weyl, spin-1 and multifold fermions, which can be considered a generalization of conventional Weyl-fermions [2].
Here we present our preliminary results for the first Angle-Resolved Photoemission Spectroscopy (ARPES) measurements of the chiral crystal Li2Pd3B which is expected to host an as-yet unobserved multifold topological superconducting phase of class DIII, which is time reversal invariant), even without odd parity paring [3]. The superconducting gap is expected to arise from the intraband coupling at time-reversal invariant momentum points leading to an unconventional multiband gap function and nodal rings [4].
[1] N. B. M. Schröter et al. Nat. Phys. 15, 759 (2019)
[2] B. Bradlyn et al., Science 353, 6299 (2016)
[3] Z. S. Gao et al., Quantum Front 1, 3 (2022)
[4] C. Lee et al., Phys. Rev. B 104, L241115 (2021)