Nonthermal effects in solids after swift heavy ion impact

Abstract

This contribution is a brief introduction to nonthermal effects related to modifications of the interatomic potential upon ultrafast excitation of the electronic system of solids, primarily focusing on the swift heavy ion track problem. We clarify the difference between the exchange of the kinetic energy of electrons (and holes) scattering on the lattice (electron-phonon coupling, "thermal effects") and the relaxation of the nonequilibrium potential energy of a solid ("nonthermal effects"). We discuss that at different degrees of electronic excitation, the modification of the interatomic potential may result in various phase transitions without an increase of the atomic temperature, i.e., at room temperature (nonthermal melting, formation of the superionic state), or in atomic acceleration causing "nonthermal heating" of the target atoms. Examples of theoretically predicted various effects are given, supported by known experimental observations.

A proceeding for SHIM 2022 (to be submitted)

References in corpus (8)

• Quantum ESPRESSO: a modular and open-source software project for quantum simulations of materials
• Density-functional tight-binding for beginners
• Electron-phonon coupling in metals at high electronic temperatures
• Thermal and nonthermal melting of silicon under femtosecond x-ray irradiation
• Electronic and atomic kinetics in solids irradiated with free-electron lasers or swift-heavy ions
• Modeling time-resolved kinetics in solids induced by extreme electronic excitation
• Reconciling anomalously fast heating rate in ion tracks with low electron-phonon coupling
• Superionic states formation in group III oxides irradiated with ultrafast lasers

Cited by in corpus (2)

• Multi-temperature atomic ensemble: nonequilibrium evolution after ultrafast electronic excitation
• Non-ionizing cross section of electron scattering on atoms in matter accounting for dynamical screening effect