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Nikolay Ovsyuk

Group of physical properties of minerals (lab. 436)

Institute of Geology and Mineralogy

Siberian Branch of Russian Academy of Sciences

Science interests
This page contains summaries of some of my research interests. Where appropriate I provide links to pdf versions of relevant publications.

Electroreflection

Low-frequency Raman scattering

The electroreflectance (ER) spectra of
semiconductors in a strong electric field should contain an oscillating part connected, in according with the Franz-Keldysh theory, with the modulation of the reduced density of states beyond the absorption edge. These oscillations are the result of interference between the wave functions of the electron and holes, which appear in interband optical transitions. (In more detail...)

In semiconductor quantum dots (QDs) not
only the electronic but also the lattice vibrational modes become discrete due to three-dimensional confinement. As the size of QDs decreases, phonons with a larger wave vector are involved in the electron-phonon interaction. Hence, the electron-phonon interaction with acoustic phonon modes becomes more pronounced as compared to the scattering of electrons by optical phonons. (In more detail...)


Nucleation

Amorphization

The scope of my interests now concerns
the investigation of the initial stages of nucleation in minerals by low-frequency Raman and Fourier transform spectroscopies. Our preliminary results show that these methods are highly effective for studying the structure micro-inhomogeneities of the size from 1 to 10 nm. (In more detail...)

We have investigated the dynamic and
static mechanisms of the amorphization of the number of frame minerals induced by external pressure and also by cation exchange. We have discovered that the major contribution to the distortions of the tetrahedra in the a-quartz at high pressure is their twisting. (In more detail...)

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Group of physical properties of minerals (lab. 436)
Institute of Geology and Mineralogy
Koptyug Pr. 3 • Novosibirsk 630090 • RUSSIA
tel 011-7-383-330-4427 • fax 011-7-383-333-2792 ovsyuk@igm.nsc.ru