Results 1 - 10 of 5169
Results 1 - 10 of 5169. Search took: 0.032 seconds
|Sort by: date | relevance|
[en] In this work we report the results of theoretical analysis of the effect of the thermal environment on the thermoelectric efficiency of molecular junctions. The environment is represented by two thermal phonon baths associated with the electrodes, which are kept at different temperatures. The analysis is carried out using the Buttiker model within the scattering matrix formalism to compute electron transmission through the system. This approach is further developed so that the dephasing parameters are expressed in terms of relevant energies, including the thermal energy, strengths of coupling between the molecular bridge and the electrodes and characteristic energies of electron–phonon interactions. It is shown that the latter significantly affect thermoelectric efficiency by destroying the coherency of electron transport through the considered system. (paper)
[en] The energy relaxation dynamics process of Pt nanoparticles with a diameter of 25 nm after a 400-nm femtosecond laser excitation was investigated using pump-probe technology with 130 fs laser pulse. Experimental results show that the process includes a fast decay with time constant of 850 fs and a slow decay with time constant of 9 ps. Theoretical discussion indicates that the former results from electron-phonon coupling process, while the latter is from phonon-phonon coupling process.
[en] Temperature dependence of the photophysical properties of europium(III) complex with the benzoylcetonate ligand were evaluated. The photostability of the complex and the temperature dependence of the 5D0 → 7F2 transition band area (maximum relative sensitivity of 5.25% K−1 at 303 K) makes this complex promising as temperature probe. The temperature dependence of the 5D0 → 7F0 transition band indicates that the electron-phonon coupling is probably the main mechanism operating in the temperature dependence of the photophysical properties of the complex.
[en] Using mappings between one-dimensional models, we argue in this note that any additional spin-lattice to the Hubbard model and the ensuing tendency towards spin-Peierls state is damaging, rather than favourable to the RVB-type superconductivity. (author). 10 refs