2024/09/10 by D. J. P. de Sousa, Seungjun Lee, de Sousa, D. J. P. +3 · 1 citation
Mathematics · Physics and Astronomy · #FOS: Physical sciences #Materials Science (cond-mat.mtrl-sci) #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Quantum chaos and dynamical systems #Quantum many-body systems #Spectral Theory in Mathematical Physics
paper · pdf · doi:10.48550/arxiv.2409.06806
openalex publication_date 2024/09/10 · openalex created_date 2024/10/22 · openalex updated_date 2026/08/01
We demonstrate that two-dimensional Kramers-Weyl fermions can be engineered in spin-orbit coupled twisted bilayers, where the chiral structure of these moiré systems breaks all mirror symmetries, confining Kramers-Weyl fermions to high-symmetry points in the Brillouin zone under time reversal symmetry. Our theoretical analysis reveals a symmetry-enforced Weyl-like interlayer moiré coupling that universally ensures an ideal radial spin-texture at arbitrary twist angles, under Cnz symmetry with n>2. First principles density functional calculation confirm the realization of these fermions in twisted α-In2Se3 bilayers, where flat bands and out-of-plane ferroelectric polarization in each layer guarantee two-dimensional Kramers-Weyl physics with perfectly ideal radial spin textures.