The parallel-tempering Monte Carlo method is used in combination with a Drude model to characterize the (H2O)6 2 cluster over the 50–190 K temperature range. Chainlike structures are found to account for about 50% of the population at 190 K, whereas they are unimportant at the temperatures below about 130 K. At the lowest temperature considered, prismlike structures are dominant. Two new low-en...

Time-resolved terahertz (THz) electromodulation spectroscopy is applied to investigate the high-frequency transport of electrons in gallium nitride at different doping concentrations and densities of threading dislocations. At THz frequencies, all structures reveal Drude transport. The analysis of the spectral response provides the fundamental transport properties, such as the electron scatteri...

In this paper, we study the reconstruction of the chirality admittance of periodic chiral structures. The media is homogeneous and the structure is periodic in one direction and invariant in another direction. The electromagnetic fields inside the chiral medium are governed by Maxwell equations together with the Drude-Born-Fedorov equations. We simplify the problem to a two-dimensional inverse ...

Fresnel reflection amplitude coefficients (fractional amplitudes) at the surface of an isotropic, intrinsically nonmagnetic chiral medium are derived on the basis of the Drude–Condon model of optical activity. The eigenvalue–eigenvector solution is obtained with use of Berreman’s 4 3 4 matrix method. Self-consistent results are obtained when the calculations are based on a new 4 3 4 matrix for ...

The recent speculation on the possibility of achieving gigantic enhancement for surface-enhanced Raman scattering at cryogenic substrate temperatures is examined using a simple theoretical model. The surfaceplasmon enhancement mechanism is modeled using the Fermi-electron gas approach instead of the Drude model as used previously in the literature. Due to the diminution of substrate polarizabil...