High-order nonlinear terahertz probing of the two-band superconductor MgB${}_2$: Third- and fifth-order harmonic generation

Abstract

We report on high-order harmonic generation in the two-band superconductor MgB${}_2$ driven by intense terahertz electromagnetic pulses. Third- and fifth-order harmonics are resolved in time domain and investigated as a function of temperature and in applied magnetic fields crossing the superconducting phase boundary. The high-order harmonics in the superconducting phase reflects nonequilibrium dynamics of the superconducting order parameter in MgB${}_2$, which is probed via nonlinear coupling to the terahertz field. The observed temperature and field dependence of the nonlinear response allows to establish the superconducting phase diagram.

9 pages, 5 figures

References in corpus (16)

• Amplitude / Higgs Modes in Condensed Matter Physics
• Impact of the electronic band structure in high-harmonic generation spectra of solids
• Vortex Imaging in the pi-Band of Magnesium Diboride
• Nonlinear electromagnetic response and Higgs mode excitation in BCS superconductors with impurities
• Theoretical description of high-order harmonic generation in solids
• Nonlinear optical response of collective modes in multiband superconductors assisted by nonmagnetic impurities
• High-order Harmonic Generation and its Unconventional Scaling Law in the Mott-insulating $\mathrm{C}{\mathrm{a}}_2\mathrm{Ru}{\mathrm{O}}_4$
• High-harmonic generation approaching the quantum critical point of strongly correlated systems
• High-harmonic generation in quantum spin systems
• Quasiclassical Theory on Third-Harmonic Generation in Conventional Superconductors with Paramagnetic Impurities
• Nonlinear microwave response of MgB2
• Metastable Vortex Lattice Phases in Superconducting MgB2
• Two-band parallel conductivity at terahertz frequencies in the superconducting state of MgB${}_2$.
• Ellipticity control of terahertz high-harmonic generation in a Dirac semimetal
• Transient Higgs oscillations and high-order nonlinear light-Higgs coupling in terahertz-wave drivenNbN superconductor
• Contribution of Collective Excitations to Third Harmonic Generation in Multiband Superconductors: the case of MgB${}_2$

Cited by in corpus (12)

• Revealing novel aspects of light-matter coupling in terahertz two-dimensional coherent spectroscopy: the case of the amplitude mode in superconductors
• High-harmonic generation in semi-Dirac and Weyl semimetals with broken time-reversal symmetry: Exploring merging of Weyl nodes
• Observation of terahertz second harmonic generation from Dirac surface states in the topological insulator Bi${}_2$Se${}_3$
• Unusual Low-Energy Collective Charge Excitations in High-$T_c$ Cuprate Superconductors
• Ultrafast dynamics of optically excited charge carriers in the room-temperature antiferromagnetic semiconductor $\alpha$-MnTe
• Direct observation of the Higgs particle in a superconductor by non-equilibrium Raman scattering
• Amplitude mode in a multi-gap superconductor MgB${}_2$ investigated by terahertz two-dimensional coherent spectroscopy
• Terahertz third-harmonic generation of lightwave driven Weyl fermions far from equilibrium
• Collective modes in superconductors including Coulomb repulsion
• Optical Pumping of Bardeen-Cooper-Schrieffer Superconductors
• Two-dimensional THz spectroscopy in electronic systems: a many-body diagrammatic approach
• Anomalous terahertz nonlinearity in disordered s-wave superconductor close to the superconductor-insulator transition