Visualization of Chiral Electronic Structure and Anomalous Optical Response in a Material with Chiral Charge Density Waves

Abstract

Chiral materials have attracted significant research interests as they exhibit intriguing physical properties, such as chiral optical response, spin-momentum locking and chiral induced spin selectivity. Recently, layered transition metal dichalcogenide 1T-TaS2 has been found to host a chiral charge density wave (CDW) order. Nevertheless, the physical consequences of the chiral order, for example, in electronic structures and the optical properties, are yet to be explored. Here, we report the spectroscopic visualization of an emergent chiral electronic band structure in the CDW phase, characterized by windmill-shape Fermi surfaces. We uncover a remarkable chirality-dependent circularly polarized Raman response due to the salient chiral symmetry of CDW, although the ordinary circular dichroism vanishes. Chiral Fermi surfaces and anomalous Raman responses coincide with the CDW transition, proving their lattice origin. Our work paves a path to manipulate the chiral electronic and optical properties in two-dimensional materials and explore applications in polarization optics and spintronics.

References in corpus (9)

• Gate-tunable Phase Transitions in 1T-TaS${}_2$
• Multiple types of topological fermions in transition metal silicides
• Discovery of topological chiral crystals with helicoid arc states
• New classes of chiral topological nodes with non-contractible surface Fermi arcs in CoSi
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• Optical detection and manipulation of spontaneous gyrotropic electronic order in a transition-metal dichalcogenide semimetal
• Chirality induced Giant Unidirectional Magnetoresistance in Twisted Bilayer Graphene
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Cited by in corpus (19)

• Electrical switching of ferro-rotational order in nano-thick 1T-TaS${}_2$ crystals
• Unconventional Thermophotonic Charge Density Wave
• Control of charge-spin interconversion in van der Waals heterostructures with chiral charge density waves
• Exciton-activated effective phonon magnetic moment in monolayer MoS2
• Understanding chiral charge-density wave by frozen chiral phonon
• Signature of Orbital Driven Finite Momentum Pairing in a 3D Ising Superconductor
• Origin of chirality in transition-metal dichalcogenides
• Comprehensive Study of Phonon Chirality under Symmetry Constraints
• Nature of metallic and insulating domains in the CDW system 1T-TaSe2
• Chiral charge density wave and backscattering-immune orbital texture in monolayer 1T-TiTe2
• Dynamic phase transition into a mixed-CDW state in 1$T$-TaS${}_2$ via a thermal quench
• Ferroaxial phonons in chiral and polar NiCo2TeO6
• Symmetry analysis of cross-circular and parallel-circular Raman optical activity
• Charge Density Waves in the 2.5-Dimensional Quantum Heterostructure
• Van der Waals devices for surface-sensitive experiments
• Light-induced nonlinear Edelstein effect under ferroaxial ordering
• Electronic Coherence Evolution at the Nearly Commensurate Incommensurate CDW Boundary of 1T-TaS2
• Strongly Enhanced Charge-Density Waves and Correlated Insulating State in Atomically Thin 1$T$-TaS${}_2$
• Emergent quantum phenomena in two-dimensional 1T-TaS2