Transition from electron-dominated to phonon-driven thermal …
2023年11月8日 · By utilizing a combination of first-principles calculations and machine-learning-interatomic-potential-based molecular dynamics simulations, we show that (contrary to the conventional understanding of electron-driven thermal transport in metals) the dominant carriers of heat in tungsten are phonons at high pressures.
Body-centered-cubic structure and weak anharmonic phonon scattering …
2019年10月8日 · It was recently found that the anharmonic phonon–phonon scattering in tungsten is extremely weak at high frequencies, leading to a predominance of electron–phonon scattering and...
Direct observation of strong momentum-dependent electron-phonon …
2024年3月13日 · We use an ultrafast electron diffuse scattering technique to resolve the nonequilibrium phonon dynamics in femtosecond–laser-excited tungsten in both time and momentum. We determine transient populations of phonon modes which show strong momentum dependence initiated by electron-phonon coupling.
Anomalously large lattice thermal conductivity in metallic tungsten ...
2020年6月1日 · The lattice thermal conductivity (κ ph) in the metallic tungsten carbide is found to be anomalously large due to the weak phonon-phonon and electron-phonon scatterings. The weak phonon-phonon scattering is a consequence of a unique combination of very strong interatomic bonding and the large atomic mass of tungsten, leading to a large acoustic ...
(PDF) Transition from electron-dominated to phonon-driven …
2023年11月8日 · By utilizing a combination of first-principles calculations and machine-learning-interatomic-potential-based molecular dynamics simulations, we show that (contrary to the conventional understanding...
Polaron and phonon properties in proton intercalated amorphous tungsten …
2008年12月22日 · We report on the evolution of the polaron and phonon mode properties in amorphous tungsten oxide thin films measured by spectroscopic ellipsometry in the infrared to ultraviolet spectral regions as a function of the intercalated proton density.
Emerging photoluminescence from the dark-exciton phonon ... - Nature
2019年6月6日 · In this letter, we report the emerging circularly polarized photoluminescence of dark-exciton phonon replica states in monolayer WSe 2, which arises from a second-order interaction between the...
Neutron Doppler broadening studies of tantalum and tungsten …
2002年5月1日 · We have measured some important phonon spectrum moments for the bcc metals tantalum and tungsten by means of neutron resonance Doppler spectroscopy. We initially established resonance parameters from the data taken at 300 and 310 K for several of the important resonances up to 85 eV in Ta and 48 eV in W.
Reference to dynamical instabilities recently clarified a long-standing discrepancy between the structural energy differences obtained from ab initio electron structure calculations and those derived through a Calphad analysis of binary phase diagrams [3,4,7]. Tungsten is then a …
Phonon spectrum and electronic structures of WTe
2021年2月15日 · WT e 2 is a transition metal dichalcogenide (TMDC) with a hexagonal crystal structure very similar to that of Mo S 2 and graphene. Two tellurium (Te) atoms are located on either side of the tungsten (W) atom, forming a stable isosceles triangle. The single-layer semiconductor phase tungsten telluride (2H- WT e 2) structure is shown in Fig. 1 (a).