نتایج جستجو برای: drude

تعداد نتایج: 1074  

2017
Jonathan Viquerat Stéphane Lantéri Claire Scheid Maciej Klemm

This report focuses on a centered-fluxes discontinuous Galerkin method coupled to a second-order Leap-Frog time scheme for the propagation of electromagnetic waves in dispersive media. After a presentation of the physical phenomenon and the classical dispersion models (particularly the Drude one), a generalized dispersive model is introduced. An a priori stability and convergence study is lead ...

Journal: :Physical review letters 2013
Y M Dai B Xu B Shen H Xiao H H Wen X G Qiu C C Homes R P S M Lobo

The optical properties of Ba0.6K0.4Fe2As2 have been determined in the normal state for a number of temperatures over a wide frequency range. Two Drude terms, representing two groups of carriers with different scattering rates (1/τ), well describe the real part of the optical conductivity σ1(ω). A "broad" Drude component results in an incoherent background with a T-independent 1/τb, while a "nar...

2003
Kazumitsu Sakai Andreas Klümper

We present exact results on the thermal conductivity of the one-dimensional spin-1/2 XXZ model in the massive antiferromagnetic and ferromagnetic regimes. The thermal Drude weight is calculated by a lattice path integral formulation. Numerical results for wide ranges of temperature and anisotropy as well as analytical results in the low and high temperature limits are presented. At finite tempe...

Journal: :Journal of High Energy Physics 2016

2014
Jing Huang Pedro E. M. Lopes Benoît Roux Alexander D. MacKerell

In this Perspective, we summarize recent efforts to include the explicit treatment of induced electronic polarization in biomolecular force fields. Methods used to treat polarizability, including the induced dipole, fluctuating charge, and classical Drude oscillator models, are presented, including recent advances in force fields using those methods. This is followed by recent results obtained ...

2016
Justin A. Lemkul Jing Huang Benoît Roux Alexander D. MacKerell

Molecular mechanics force fields that explicitly account for induced polarization represent the next generation of physical models for molecular dynamics simulations. Several methods exist for modeling induced polarization, and here we review the classical Drude oscillator model, in which electronic degrees of freedom are modeled by charged particles attached to the nuclei of their core atoms b...

2016
Koichi Shimakawa Safa Kasap Takayoshi Kobayashi

It is known that deviation from the Drude law for free carriers is dramatic in most electronically conductive nanomaterials. We review recent studies of the conductivity of nanoscale materials at terahertz (THz) frequencies. We suggest that among a variety of theoretical formalisms, a model of series sequence of transport involving grains and grain boundaries provides a reasonable explanation o...

2001
Tae-In Jeon D. Grischkowsky Reghu Menon

Using THz time-domain spectroscopy ~THz-TDS!, we have measured the absorption and dispersion of 7.5/~V cm! conducting poly-3-methylthiophene film from low frequencies up to 4 THz. From these measurements the complex conductance that increases with increasing frequency was obtained over this frequency range. The results do not follow simple Drude theory and are not comparable with normal metal a...

Journal: :Journal of physics. Condensed matter : an Institute of Physics journal 2014
P Zheng Y G Shi A F Fang T Dong K Yamaura N L Wang

We present the optical conductivity spectra for the newly discovered cubic perovskite structure BaOsO3 at various temperatures. The compound exhibits metallic behaviour above 50 K, but becomes non-metallic below 50 K. However, below 550 cm(-1), neither the typical Drude response nor an energy gap is observed in optical conductivity spectra from 300 K to 10 K. A broad peak centred at about 550 c...

2006
Marc Scheffler Martin Dressel Martin Jourdan Hermann Adrian

While the effective mass of heavy fermions governs their thermodynamics, the optical properties are dominated by the characteristic relaxation rate which is expected to scale inversely with the effective mass. At the relaxation rate clear features, the so-called Drude response occur in the real and imaginary parts of the complex conductivity. Conventional optical spectroscopy can only indirectl...

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