Regensburg 2025 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 4: Electron Theory of Magnetism and Correlations
MA 4.6: Vortrag
Montag, 17. März 2025, 10:45–11:00, H19
Emergent Majorana Metal from a Chiral Spin Liquid — •Shi Feng1,2, Penghao Zhu2, Kang Wang3, Tao Xiang3, and Nandini Trivedi2 — 1Technical University of Munich, Garching, Germany — 2The Ohio State University, Columbus, USA — 3Institute of Physics, Chinese Academy of Sciences, China
We propose a novel mechanism to explain the emergence of an intermediate gapless spin liquid phase (IGP) in the antiferromagnetic Kitaev model in an externally applied magnetic field, sandwiched between the well-known gapped chiral spin liquid (CSL) and the gapped partially polarized (PP) phase. We propose in moderate fields π-fluxes nucleate in the ground state and trap Majorana zero modes. As these fluxes proliferate with increasing field, the Majorana zero modes overlap creating an emergent Z2 Majorana metallic state with a ‘Fermi surface’ at zero energy. We further show that the Majorana spectral function captures the dynamical spin and dimer correlations obtained by the infinite Projected Entangled Pair States (iPEPS) method thereby validating our variational approach. The emergence of the IGP as a Majorana metal at zero temperature indicates a new class of gapless QSLs alongside the commonly recognized Dirac spin liquids and U(1) spinon Fermi surfaces in prevailing theories, bringing new insights into the nature of various candidate QSL phases of matter stabilized by moderate magnetic fields.
Keywords: Quantum Spin Liquid; Kitaev Material; Fractionalization; Topological Order; Frustrated Magnetism