Effect of screening of the electron-phonon interaction on mass renormalization and optical conductivity of the extended Holstein model polarons

Mobile small bipolarons on a three-dimensional cubic lattice

“…It is found in one dimension that only a small attractive force between electrons leads to pairing, the most important factor being the nearest neighbor interaction when considering long ranged interactions. 7,19 Two dimensional work also shows us that inclusion of nearestneighbor interaction is responsible for significant change compared with the Hubbard-Holstein model. 8,20 Light bipolarons are found on a simple square lattice, showing that elaborate lattices are not needed to create small light pairs that have the potential to form Bose condensates.…”

Microscopic States and the Verwey Transition of Magnetite Nanocrystals Investigated by Nuclear Magnetic Resonance

“…The relation, g ≈ d –0.5 , may provide information for the development of a rigorous theory about the e – ph coupling in QC limits. The environmental screening effects in nanoparticles, which has also been observed in the band-gap dependency in quantum dots, , seem to make the exponent deviate from unity.…”

Optical Phonon Behaviors of Photocharged Nanocrystals: Effects of Free Charge Carriers

“…Similar results were obtained for other three samples (data not shown). The practical situation is certainly more complicated considering the contributions from multiple resonant electronic states and the interference between these states, yet the reduction in EPC strength is still expected due to the screening by the induced free carriers. ,,, The mechanism for the increase in electronic dephasing rate upon photocharging is still unclear and requires further study. Except for the screening effect, another possible origin of the reduction of overtone to fundamental ratios may be the band-filling effect, due to which the near-resonant state with larger contributions to the overtone intensities can be removed by the induced free carriers, discussed in detail in Supporting Information.…”