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Free electron model
About: Free electron model is a research topic. Over the lifetime, 4678 publications have been published within this topic receiving 103535 citations.
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TL;DR: In this article, the screening of a test charge by partially degenerate non-ideal free electrons at conditions related to warm dense matter and dense plasmas is investigated using linear response theory and the local field correction based on ab inito Quantum Monte-Carlo simulations data.
Abstract: The screening of a test charge by partially degenerate non-ideal free electrons at conditions related to warm dense matter and dense plasmas is investigated using linear response theory and the local field correction based on ab inito Quantum Monte-Carlo simulations data. The analysis of the obtained results is performed by comparing to the random phase approximation and the Singwi-Tosi-Land-Sjolander approximation. The applicability of the long-wavelength approximation for the description of screening is investigated. The impact of electronic exchange-correlations effects on structural properties and the applicability of the screened potential from linear response theory for the simulation of the dynamics of ions are discussed.
26 citations
TL;DR: The contribution of free electrons to the refractive index and extinction coefficient of Ga−doped CdS has been measured in a series of samples with carrier concentrations ranging from about 1017 to 2×1019 electrons/cm3.
Abstract: The contribution of free electrons to the refractive index and extinction coefficient of Ga‐doped CdS has been measured in a series of samples with carrier concentrations ranging from about 1017 to 2×1019 electrons/cm3. The effective mass m* for electrons near the bottom of the conduction band was calculated from the free electron contribution to the refractive index and from the carrier concentration as determined from the Hall coefficient. The result, m*=(0.22±0.01)me is in satisfactory agreement with previous studies by other workers. The magnitude and wavelength variation of the absorption coefficient observed with about 1017 carriers/cm3 are in fair agreement with theoretical results calculated for a polar‐mode lattice scattering mechanism. Although similar data for 2×1018 carriers/cm3 are in good quantitative agreement with the impurity scattering theory at room temperature, the absorption for high carrier concentration is observed to decrease with temperature, in contradiction with the theory for a...
26 citations
TL;DR: In this paper, the Raman phonon frequency of Si heavily doped with P, As, and Sb by means of ion implantation and laser annealing (IILA) has been measured.
26 citations
TL;DR: In this article, a reduced dimensionality model was proposed for double ionization of atoms in strong laser pulses using a reduced-dimensional model, which confine each electron to move along the lines that point towards the twoparticle Stark saddle in the presence of a field.
Abstract: We discuss double ionization of atoms in strong laser pulses using a reduced dimensionality model. Following the insight obtained from an analysis of the classical mechanics of the process, we confine each electron to move along the lines that point towards the two-particle Stark saddle in the presence of a field. The resulting effective two-dimensional model is similar to the aligned electron model, but it enables correlated escape of electrons with equal momenta, as observed experimentally. The time-dependent solution of the Schr\"odinger equation allows us to discuss in detail the time dynamics of the ionization process, the formation of electronic wave packets, and the development of the momentum distribution of the outgoing electrons. In particular, we are able to identify the rescattering process, simultaneous direct double ionization during the same field cycle, as well as other double ionization processes. We also use the model to study the phase dependence of the ionization process.
26 citations
TL;DR: The nitrogen vacancy g-C3N4 obtained by the thermal polymerization urea possessed the largest exciton binding energy, and the nitrogen vacancies would capture excitons and promote them to dissociate into the free electrons and the holes at energy disordered areas as discussed by the authors.
26 citations