نتایج جستجو برای: non equilibrium electron energy
تعداد نتایج: 2246458 فیلتر نتایج به سال:
Several dynamic thermal and nonthermal scattering processes affect ultrafast heat transfer 7 in metals after short-pulsed laser heating. Even with decades of measurements of electron8 phonon relaxation, the role of thermal vs. nonthermal electron and phonon scattering on 9 overall electron energy transfer to the phonons remains unclear. In this work, we derive 10 an analytical expression for th...
Recently the Jarzynski equation have been under many investigations. In this equation a relation between the average exponential of the work done on a system under non-equilibrium condition and equilibrium free energy differences is established. In different papers the equation has already been extended to different conditions. In this paper we will extend it to a situation that a system is dri...
The electron energy relaxation in semiconductors and insulators after high-level external excitation is analysed by a semi-classical approach based on a kinetic equation of the Boltzmann type. We show that the non-equilibrium distributions of electrons and holes have a customary Fermi-like shape with some effective temperature but also possess a high-energy non-Fermian 'tail'. The latter may ex...
A fully relativistic/QED theory of light pressure of an isotropic, in particular relic, radiation yields analytic results in the momentum decay of an electron over entire span of energies in the universe. Using a FokkerPlanck-like equation, the evolution of initial extremely-high-T electron distribution to low-energy spectral line is analytically obtained for momentum span over tens orders of m...
Capturing the dynamic electronic band structure of a correlated material presents a powerful capability for uncovering the complex couplings between the electronic and structural degrees of freedom. When combined with ultrafast laser excitation, new phases of matter can result, since far-from-equilibrium excited states are instantaneously populated. Here, we elucidate a general relation between...
The electron-phonon interaction is the dominant process that controls the energy relaxation of carriers, in semiconductors and related heterostructures. If the excess energy of the electron ensemble is sufficiently high, the process of electron cooling may generate significant nonequilibrium electron and optical-phonon populations which may cause substantial changes in the carrier relaxation ki...
Based on the non-equilibrium Green’s function formalism the performance of carbon nanotube field-effect transistors has been studied. The effects of elastic scattering and the impact of parameters of inelastic scattering, such as electron-phonon coupling strength and phonon energy, on the device performance are analyzed.
This article considers the break in viscosity curves that appears in the glass transition region. It demonstrates that the only possibility to interpret properly the break within the frameworks of the activation energy theory is to assume that at least several independent processes are taking place. Single process cannot explain the break. This assumption was already developed in details in the...
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