Giant and Broadband Circular Dichroism from Particle-Hole Symmetry Breaking in Weyl Semimetals

Abstract

Circular dichroism originates from symmetry breaking of material structure, leading to differential absorption of left- and right-circularly polarized light. However, circular dichroism in most materials is inherently weak and spectrally narrow, especially in the mid-to-far infrared. Here, we uncover giant infrared circular dichroism in the magnetic-field-forced Weyl semimetal Mn(Bi,Sb)2Te4, driven by extreme particle-hole symmetry breaking. Helicity-resolved magneto-infrared spectroscopy reveals circular dichroism exceeding 3000 mdeg (~130 mdeg/nm) with above-degree response extending over the 6-13 μm spectral range. The optical resonances are enhanced by a strong band nesting effect intrinsic to the Landau levels of type-II Weyl dispersion. A symmetry-based kp model reproduces these magneto-infrared responses and demonstrates that magnetization-induced asymmetric spin-orbit coupling generates particle-hole symmetry breaking, suppressing spin-up, parity-even wavefunction components in the valence Landau band and thereby producing pronounced optical helicity selectivity. Our findings establish particle-hole symmetry breaking as an effective route toward helicity-resolved optical control in quantum materials.

References in corpus (47)

• Magnetic-field-induced quantized anomalous Hall effect in intrinsic magnetic topological insulator MnBi${}_2$Te${}_4$
• Ultrahigh mobility and giant magnetoresistance in the Dirac semimetal Cd${}_3$As${}_2$
• Prediction and observation of the first antiferromagnetic topological insulator
• Intrinsic magnetic topological insulators in van der Waals layered MnBi${}_2$Te${}_4$-family materials
• Topological axion states in magnetic insulator MnBi${}_2$Te${}_4$ with the quantized magnetoelectric effect
• Kramers-Kronig constrained variational analysis of optical spectra
• Chiral plasmonics
• Valley Zeeman Effect in Elementary Optical Excitations of a Monolayer WSe2
• Robust axion insulator and Chern insulator phases in a two-dimensional antiferromagnetic topological insulator
• Unique thickness-dependent properties of the van der Waals interlayer antiferromagnet $\mathrm{MnB}{\mathrm{i}}_2\mathrm{T}{\mathrm{e}}_4$ films
• Multifunctional Antiferromagnetic Materials with Giant Piezomagnetism and Noncollinear Spin Current
• Direct optical detection of Weyl fermion chirality in a topological semimetal
• High-Chern-Number and High-Temperature Quantum Hall Effect without Landau Levels
• Quantized Faraday and Kerr rotation and axion electrodynamics of a 3D topological insulator
• Band nesting and the optical response of two-dimensional semiconducting transition metal dichalcogenides
• Layer Hall effect in a 2D topological Axion antiferromagnet
• Berry Curvature Enhanced Nonlinear Photogalvanic Response of Type-II Weyl Cone
• Intrinsic magnetic topological insulator phases in the Sb doped MnBi2Te4 bulks and thin flakes
• Predicted Unusual Magnetoresponse in Type-II Weyl Semimetals
• Evolution of structural, magnetic and transport properties in MnBi2-xSbxTe4
• Magnetically Controllable Topological Quantum Phase Transitions in Antiferromagnetic Topological Insulator MnBi${}_2$Te${}_4$
• Twist engineering of the two-dimensional magnetism in double bilayer chromium triiodide homostructures
• Temperature-tunable Fano resonance induced by strong coupling between Weyl fermions and phonons in TaAs
• Magnetic-field-induced robust zero Hall plateau state in MnBi${}_2$Te${}_4$ Chern insulator
• Magneto-optics of massive Dirac fermions in bulk Bi2Se3
• Electric control of a canted-antiferromagnetic Chern insulator
• Axion optical induction of antiferromagnetic order
• Evolution of Magnetic Interactions in Sb-substituted MnBi2Te4
• Structural Chirality and Electronic Chirality in Quantum Materials
• Quantized anomalous Hall resistivity achieved in molecular beam epitaxy-grown MnBi2Te4 thin films
• Theory of optical axion electrodynamics and application to the Kerr effect in topological antiferromagnets
• Chiral Wave-packet Scattering in Weyl Semimetals
• Absorption of circular polarized light in tilted Type-I and II Weyl semimetals
• Spectroscopic realization of large surface gap in a doped magnetic topological insulator
• Landau level spectroscopy of massive Dirac fermions in single-crystalline ZrTe5 thin flakes
• Antiferromagnetic Quantum Anomalous Hall Effect Modulated by Spin Flips and Flops
• EuCd${}_2$As${}_2$: a magnetic semiconductor
• Origin of Magnetic Circular Dichroism in GaMnAs: Giant Zeeman Splitting versus Spin Dependent Density of States
• Determine the chirality of Weyl fermions from the circular dichroism spectra of time-dependent ARPES
• Spontaneous valley polarization of interacting carriers in a monolayer semiconductor
• The discovery of three-dimensional Van Hove singularity
• Towards the Quantized Anomalous Hall effect in AlO${}_x$-capped MnBi${}_2$Te${}_4$
• Infrared study of the multiband low-energy excitations of the topological antiferromagnet MnBi${}_2$Te${}_4$
• Giant nonlocal edge conduction in the axion insulator state of MnBi2Te4
• Complete optical valley polarization in Weyl semimetals in strong magnetic fields
• Kerr, Faraday, and Magnetoelectric Effects in MnBi${}_2$Te${}_4$ Thin Films
• A High-Flux and High-Efficiency Setup for Magneto-Infrared Spectroscopy