We develop a microscopic model for the recently demonstrated double-quantum-dot maser. In characterizing the gain of this device we find that, in addition to the direct stimulated emission of photons, there is a large contribution from the simultaneous emission of a photon and a phonon, i.e., the phonon sideband. We show that this phonon-assisted gain typically dominates the overall gain, which...

abstract this study investigates casual relationship between co2 emission and gross domestic product per capita in five different country groups, using cross- country data for the period 1960-2007. to achieve the purpose, the co- integration test and error correction models are applied. results confirm casual relationships between the two variables. a unilateral relationship between gdp and co2...

The Phase I FOPI data evidence for highly central Au + Au collisions at 100, 150 and 250 A·MeV systematically larger mean kinetic energies for He fragments relative to the H values [1]. The EOS Collaboration find the same trend with somewhat larger size [2]. Microscopic transport models [3] and hybrid hydrodynamical models, including pure Coulomb repulsion at the freeze-out moment [4] do not su...

We present results of a fundamental device simulation study aimed at an optimization of high-power tapered semiconductor optical amplifiers for picosecond pulse amplification. Thereby, the microscopic light-matter coupling is described on the basis of a spatially resolved Maxwell–Bloch– Langevin description that takes into account many-body-carrier interactions, energy transfer between the carr...

Atomically thin transition metal dichalcogenides are direct-gap semiconductors with strong light-matter and Coulomb interactions. The latter accounts for tightly bound excitons, which dominate their optical properties. Besides the optically accessible bright excitons, these systems exhibit a variety of dark excitonic states. They are not visible in the optical spectra, but can strongly influenc...

The microscopic connections between solvation dynamics and the experimentally measured dynamic emission Stokes shift are explored by molecular dynamics simulation using the hydrated electron as a fully quantum mechanical probe. Solvent response functions are computed using the method of spectral reconstruction at various time resolutions for both fluorescence and stimulated emission and compare...