We investigate the transport properties of charge carrier disordered organic
semiconductors with a focus on the determination and analysis of charge carrier
mobility. By understanding that charge transport is due to incoherent hopping of
charge carriers across localized states, we use a model that relates mobility to charge
carrier (not small polarons) hopping by thermal activation. We...
This study focused on investigating whether ball milling and cold rolling can improve the hydrogen absorption and desorption kinetics of magnesium hydride (MgH2) and reduce its process temperature. Despite having a high hydrogen storage capacity, good reversibility, and low cost, MgH2 has not been widely used due to its high temperature of operation and slow rate of hydrogen absorption and...
In electron-doped Strontium Titanate (SrTiO3), ferroelectricity can coexist simultaneously with metallicity. Absent any electrons, the ferroelectric domains will orient themselves into the so-called “Kittel Domains” in order to minimize their free energy. The impact of free electrons on their behaviour remains under active investigation with research suggesting that electron density plays a...
We present the results of an extensive study of the phase diagram and spin wave excitations for a general spin model on a hexagonal AB-stacked kagome lattice. Depending on the strength of the spin-orbit coupling (SOC), some spin and lattice rotations may become decoupled, leading to considerably larger symmetry groups than typical magnetic groups. Thus, we provide a detailed symmetry...
We synthesized a green-fluorescent conjugated polymer (CP) referred to as “Atums Green”. This organic-soluble polymer had a molecular weight up to 50 kDa and featured a strong green fluorescence both in solution and in the solid state. Photophysical studies were done to explore its application in laser photonics in the green band. The PL emission has an absolute quantum efficiency as high as...
When a Brownian particle moves too rapidly for the medium to effectively absorb its kinetic energy, the standard Einstein theory of diffusion with a constant viscous friction becomes invalidated. A natural description of this kind of Brownian dynamics is to take the friction as a decreasing even function of the particle's velocity. The stochastic equation of motion is formulated within this...
London dispersion is a weak, attractive, intermolecular force that occurs due to interactions between instantaneous dipole moments. While individual dispersion contributions are small, they are the dominating attractive force between non-polar species and determine many properties of interest. Standard methods in density-functional theory do not account for dispersion contributions, so a...
The fourth-generation synchrotron radiation light source has the outstanding advantages such as low divergence and high brightness, facilitating high spatial and energy resolution X-ray spectroscopy studies and the detection of “light-in-light-out” photon-hungry spectroscopy. The proposed high-resolution soft X-ray spectroscopy beamlines of Shenzhen Industrial Light Source (SILF) will...
The unique structure of two-dimensional (2D) Dirac crystals, with electronic bands linear in the proximity of the Brillouin-zone boundary and the Fermi energy, creates anomalous situations where small Fermi-energy perturbations critically affect the electron-related lattice properties of these systems.[1] We have studied the interaction of these electrons with acoustic phonons, where the...
