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Wannier-Stark effect and electron-phonon interaction in macroporous silicon structures with SiO₂ nanocoatings

Karachevtseva L., Goltviansky Y., Kolesnyk O., Lytvynenko O., Stronska O.

Opto-Electronics Review

2014

Vol. 22, No. 4

201-206

We investigated the contribution of electron-phonon interaction to the broadening parameter of the Γ Wannier-Stark lader levels in oxidized macroporous silicon structures with different concentration of Si-O-Si states (TO and LO phonons). The obtained value of the Wannier-Stark ladder Γ parameter is much less than the djacent level energy evaluated from giant oscillations of resonance electron scattering on the surface states. We determined the influence of broadening on the oscillation amplitude in IR absorption spectra as interaction of the surface multi-phonon polaritons with scattered electrons. This interaction transforms the resonance electron scattering in samples with low concentration of Si-O-Si states into ordinary scattering on ionized impurities for samples with high concentration of Si-O-Si states. The transformation takes place at the scattering lifetime coinciding with the period of electron oscillations in the surface electric field.

Optical study of ß”-(bis(ethylenedithio)tetrathiafulvalene)2SF5CH2SO3 Activation of intramolecular modes

Olejniczak I., Barszcz B., Graja A., Schlueter J. A.

Materials Science Poland

2009

Vol. 27, No. 3

621--627

We report on the temperature dependences of polarized reflectance spectra of ß”-(bis(ethylenedithio) tetrathiafulvalene)2SF5CH2SO3. The material remains in the charge-ordered state over the whole temperature range. Room temperature infrared spectra display the response characteristic of a quasi-twodimensional organic conductor, with a broad mid-infrared electronic excitation and a number of vibrational features related to intramolecular modes of both the bis(ethylenedithio)tetrathiafulvalene (ET) donor molecule and the SF5CH2SO3 anion. Upon lowering the temperature, unusual activation of intramolecular modes of ET is observed. We suggest that this effect is connected with electronmolecular vibration coupling within a dimerized lattice.