Real-time Observation of Phonon-Mediated $\sigma$-$\pi$ Interband Scattering in MgB2

Abstract

In systems having an anisotropic electronic structure, such as the layered materials graphite, graphene and cuprates, impulsive light excitation can coherently stimulate specific bosonic modes, with exotic consequences for the emergent electronic properties. Here we show that the population of E${}_{2g}$ phonons in the multiband superconductor MgB${}_2$ can be selectively enhanced by femtosecond laser pulses, leading to a transient control of the number of carriers in the σ-electronic subsystem. The nonequilibrium evolution of the material optical constants is followed in the spectral region sensitive to both the a- and c-axis plasma frequencies and modeled theoretically, revealing the details of the $\sigma$-$\pi$ interband scattering mechanism in MgB${}_2$.

5 pages, 3 figures, 7 supplemental pages, 6 supplemental figures

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Cited by in corpus (13)

• Ultrafast Hot Phonon Dynamics in MgB${}_2$ Driven by Anisotropic Electron-Phonon Coupling
• Ultrafast dynamics of hot charge carriers in an oxide semiconductor probed by femtosecond spectroscopic ellipsometry
• Superconductive materials with MgB2-like structures from data-driven screening
• Hund's coupling driven photo-carrier relaxation in the two-band Mott insulator
• Electron-Phonon-Driven Three-Dimensional Metallicity in an Insulating Cuprate
• High-order nonlinear terahertz probing of the two-band superconductor MgB${}_2$: Third- and fifth-order harmonic generation
• Lattice-Mediated Magnetic Order Melting in TbMnO3
• Unusual Low-Energy Collective Charge Excitations in High-$T_c$ Cuprate Superconductors
• Fingerprints of hot-phonon physics in time-resolved correlated quantum lattice dynamics
• Overscreening-free electron-phonon interaction in realistic materials
• Energy flow during relaxation in an electron-phonon system with multiple modes: A nonequilibrium Green's function study
• Properties and challenges of hot-phonon physics in metals: MgB${}_2$ and other compounds
• Multi-Gap superconductivity in HgS under pressure