Higgs-mode radiance and charge-density-wave order in 2H-NbSe${}_2$

Abstract

Despite being usually considered two competing phenomena, charge-density-wave and superconductivity coexist in few systems, the most emblematic one being the transition metal dichalcogenide 2H-NbSe${}_2$. This unusual condition is responsible for specific Raman signatures across the two phase transitions in this compound. While the appearance of a soft phonon mode is a well-established fingerprint of the charge-density-wave order, the nature of the sharp sub-gap mode emerging below the superconducting temperature is still under debate. In this work we use the external pressure as a knob to unveil the delicate interplay between the two orders, and consequently the nature of the superconducting mode. Thanks to an advanced extreme-conditions Raman technique we are able to follow the pressure evolution and the simultaneous collapse of the two intertwined charge density wave and superconducting modes. The comparison with microscopic calculations in a model system supports the Higgs-type nature of the superconducting mode and suggests that charge-density-wave and superconductivity in 2H-NbSe${}_2$ involve mutual electronic degrees of freedom. These findings fill knowledge gap on the electronic mechanisms at play in transition metal dichalcogenides, a crucial step to fully exploit their properties in few-layers systems optimized for devices applications.

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Cited by in corpus (37)

• Higgs Mode in Superconductors
• Patterns and driving forces of dimensionality-dependent charge density waves in 2H-type transition metal dichalcogenides
• Using controlled disorder to probe the interplay between charge order and superconductivity in NbSe2
• Nonlinear electromagnetic response and Higgs mode excitation in BCS superconductors with impurities
• Classification and characterization of nonequilibrium Higgs modes in unconventional superconductors
• Pressure induced collapse of the charge density wave and Higgs mode visibility in 2H-TaS${}_2$
• Collective modes and terahertz near-field response of superconductors
• Infrared activation of the Higgs mode by supercurrent injection in superconducting NbN
• Theory of coherent oscillations detection in THz pump-probe spectroscopy: from phonons to electronic collective modes
• Higgs-mode resonance in third harmonic generation in NbN superconductors: multiband electron-phonon coupling, impurity scattering, and polarization-angle dependence
• Superconducting fluctuations probed by the Higgs mode in Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+x}$ thin films
• Theory of driven Higgs oscillations and third-harmonic generation in unconventional superconductors
• Revealing novel aspects of light-matter coupling in terahertz two-dimensional coherent spectroscopy: the case of the amplitude mode in superconductors
• Persistent oscillations of the order parameter and interaction quench phase diagram for a confined Bardeen-Cooper-Schrieffer Fermi gas
• Collapse of critical nematic fluctuations in FeSe under pressure
• Following the Higgs mode across the BCS-BEC crossover in two dimensions
• Two Distinct Charge Density Wave Orders and Emergent Superconductivity in Pressurized CuTe
• Spin currents driven by the Higgs mode in magnetic superconductors
• Classification of Lifshitz invariant in multiband superconductors: an application to Leggett modes in the linear response regime in Kagome lattice models
• Engineering Higgs dynamics by spectral singularities
• Signatures of the Higgs mode in transport through a normal-metal--superconductor junction
• Floquet engineering Higgs dynamics in time-periodic superconductors
• Electron-momentum dependence of electron-phonon coupling underlies dramatic phonon renormalization in YNi${}_2$B${}_2$C
• Unveiling resilient superconducting fluctuations in atomically thin NbSe${}_2$ through Higgs mode spectroscopy
• Higgs modes in two-dimensional spatially-indirect exciton condensates
• Direct observation of the Higgs particle in a superconductor by non-equilibrium Raman scattering
• Optically active Higgs and Leggett modes in multiband pair-density-wave superconductors with Lifshitz invariant
• Spatially-resolved dynamics of the amplitude Schmid-Higgs mode in disordered superconductors
• Coupling the Higgs mode and ferromagnetic resonance in spin-split superconductors with Rashba spin-orbit coupling
• Unconventional photo-induced charge-density-wave dynamics in 2H-NbSe${}_2$
• Higgs physics in superconductors
• Reducing the frequency of the Higgs mode in a helical superconductor coupled to an LC-circuit
• Terahertz pulse-driven collective mode in the nematic superconducting state of Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$
• Higgs mode stabilization by photo-induced long-range interactions in a superconductor
• Two-dimensional coherent spectroscopy of disordered superconductors in the narrow-band and broad-band limits
• AC Josephson Signatures of the Superconducting Higgs Mode
• Raman response of collective modes in multicomponent superconductors