Strong nonlinear optical response and transient symmetry switching in Type-II Weyl semimetal $\beta$-WP2

Abstract

The topological Weyl semimetals with peculiar band structure exhibit novel nonlinear optical enhancement phenomena even for light at optical wavelengths. While many intriguing nonlinear optical effects were constantly uncovered in type-I semimetals, few experimental works focused on basic nonlinear optical properties in type-II Weyl semimetals. Here we perform a fundamental static and time-resolved second harmonic generation (SHG) on the three dimensional Type-II Weyl semimetal candidate $\beta$-WP${}_2$. Although $\beta$-WP${}_2$ exhibits extremely high conductivity and an extraordinarily large mean free path, the second harmonic generation is unscreened by conduction electrons, we observed rather strong SHG response compared to non-topological polar metals and archetypal ferroelectric insulators. Additionally, our time-resolved SHG experiment traces ultrafast symmetry switching and reveals that polar metal $\beta$-WP${}_2$ tends to form inversion symmetric metastable state after photo-excitation. Intense femtosecond laser pulse could optically drive symmetry switching and tune nonlinear optical response on ultrafast timescales although the interlayer coupling of $\beta$-WP${}_2$ is very strong. Our work is illuminating for the polar metal nonlinear optics and potential ultrafast topological optoelectronic applications.

arXiv comment8 pages, 5 figures

References in corpus (39)

• Weyl and Dirac Semimetals in Three Dimensional Solids
• Discovery of a Weyl Fermion Semimetal and Topological Fermi Arcs
• Type-II Weyl Semimetals
• Titanic Magnetoresistance in WTe2
• Ultrafast switching to a stable hidden topologically protected quantum state in an electronic crystal
• Prediction of the Weyl semimetal in the orthorhombic MoTe2
• Topological nature of nonlinear optical effects in solids
• Giant anisotropic nonlinear optical response in transition metal monopnictide Weyl semimetals
• Colossal Bulk Photovoltaic Effect in a Weyl Semimetal
• Creating stable Floquet-Weyl semimetals by laser-driving of 3D Dirac materials
• Semimetals for high performance photodetection
• Berry Curvature Enhanced Nonlinear Photogalvanic Response of Type-II Weyl Cone
• Observation of Weyl nodes and Fermi arcs in TaP
• Light-induced emergent phenomena in 2D materials and topological materials
• Light-Induced Charge Density Wave in LaTe${}_3$
• Extremely high magnetoresistance and conductivity in the type-II Weyl semimetals WP2 and MoP2
• Ultrafast changes in lattice symmetry probed by coherent phonons
• Robust Type-II Weyl Semimetal Phase in Transition Metal Diphosphides XP${}_2$ (X = Mo, W)
• Evidence of an odd-parity hidden order in a spin-orbit coupled correlated iridate
• Optical Signatures of Weyl Points in TaAs
• Cooperative photoinduced metastable phase control in strained manganite films
• Nonlinear optical probe of tunable surface electrons on a topological insulator
• Chiral terahertz wave emission from the Weyl semimetal TaAs
• A parity-breaking electronic nematic phase transition in the spin-orbit coupled metal Cd${}_2$Re${}_2$O${}_7$
• Resonance-enhanced optical nonlinearity in the Weyl semimetal TaAs
• Tracking ultrafast photocurrents in the Weyl semimetal TaAs using THz emission spectroscopy
• Electronic correlations and flattened band in magnetic Weyl semimetal candidate Co3Sn2S2
• Unconventional charge density wave and photoinduced lattice symmetry change in Kagome Metal CsV${}_3$Sb${}_5$ probed by time-resolved spectroscopy
• Manipulation of Jeff=3/2 states by tuning the tetragonal distortion
• Observation of Weyl nodes in robust type-II Weyl semimetal WP2
• Large magnetoresistance in type-II Weyl semimetal WP${}_2$
• All-optical nonequilibrium pathway to stabilizing magnetic Weyl semimetals in pyrochlore iridates
• Manipulating Weyl quasiparticles by orbital-selective photoexcitation in WTe2
• Linear and nonlinear optical probe of the ferroelectric-like phase transition in a polar metal, LiOsO3
• Strong and Tunable Electrical-Anisotropy in Type-II Weyl Semimetal Candidate WP2 with Broken Inversion Symmetry
• A light-induced Weyl semiconductor-to-metal transition mediated by Peierls instability
• Effect of topology on quasi-particle interactions in the Weyl semimetal WP${}_2$
• Optical spectroscopy and ultrafast pump-probe study of structural phase transition in 1T'-TaTe2
• Room-Temperature Anisotropic Plasma Mirror and Polarization-Controlled Optical Switch Based on Type-II Weyl Semimetal WP2

Cited by in corpus (1)

• Role of interlayer shear phonons on lattice symmetry switching in the transition metal dichalcogenide WTe${}_2$