A study is performed of the conditions needed to generate an incoherent exciton echo in a layer of CdSe/CdS/ZnS semiconductor quantum dots.

A theoretical investigation is performed of the possibility and conditions of locked exciton echo excitation and modulation spectroscopy on the localized excitons of an ensemble of nanocrystals with an emitting core of CdSe.

A theoretical investigation is performed for the possibility and conditions of the stimulated induction of excitons in a thin layer of semiconductor quantum dots upon excitation by continuous-wave laser radiation.

A theoretical investigation is performed to determine the possibility of and conditions for self-induced transparency on Wannier–Mott excitons in a layer of semiconductor quantum dots.

We discuss the possibility of exciting a stimulated excitonic induction in a thin film of semiconductor quantum dots and analyze the possibility of writing and reading out the two-quantum excitonic transient holograms in such samples.

The possibility and conditions of recording and reading out two-quantum transient holograms on the exciton levels of CdSe/CdS/ZnS-type semiconductor quantum dots are studied theoretically.

We have studied theoretically a possibility to construct a quantum gate on the basis of semiconductor quantum dots of a core/shell type.

The possibility and the conditions of the formation of correlated "gratings" of electrons and their spins in a semiconductor film containing CdSe/CdS nanoparticles (which are the quantum dots) have been studied. Notably, the induction of electron spin "gratings" on quantum dots has been considered for the first time. We have suggested to perform an excitation of the film in the two photon absorption mode using two crossed (at an angle of 60 degrees) femtosecond laser beams. As a result of the excitation, two nonequilibrium "gratings" are induced simultaneously in the excitation area of the film. If the exciting pulses have the same polarizations, then induced "gratings" of electrons are formed. However, in the case when the exciting pulses have mutually orthogonal polarizations, the formation of induced "gratings" of electron spins takes place. The same exciting pulses excite the electrons of CdSe/CdS nanoparticles into a superposition state. Then the free induction decay signal is generated. This signal being diffracted by induced "gratings" plays the role of a probe pulse in the suggested experimental scheme. The diffracted signals propagating in two mutually opposite directions are correlated (i.e., they are identical). Their wavefronts can carry the correlated transient holograms. Other possible applications of correlated "gratings" (in spintronics and in coherent femtosecond laser spectroscopy) are also discussed.

Теоретически исследуются возможность и условия создания квантового вентиля и экситонной когерентности на полупроводниковых квантовых точках (КТ). Обсуждаются также перспективы наблюдения экситонного эха на КТ.

The possibility of and conditions for creating a quantum gate and exciton coherence on semiconductor quantum dots are investigated theoretically. Prospects for observing exciton echoes on quantum dots are discussed.

The possibility and conditions of a generation of the correlated free induction decay signals in CdSe–CdS nanostructures under two- and three-photon excitation by crossed femtosecond beams of the Ti:sapphire laser radiation are considered. It is shown that these correlated signals will be emitted in two opposite directions. The information contained in the temporal shapes and wavefronts of these signals will be correlated.

This paper is devoted to the discussion of a possibility of the femtosecond correlated transient holograms recording in CdS crystal under two-quantum excitation.

The possibility and conditions of the correlated signals of stimulated photon echo (SPE) generation under three-photon femtosecond excitation of a sample, which is an ensemble of N semiconductor nanoparticles, are investigated. Each of these nonoparticles consists of a CdSe core covered by a CdS shell. The phase matching conditions for correlated SPE signal formation in such a sample are obtained.

We consider the possibility of observing a femtosecond correlated photon echo (FCPE) under two-photon excitation of CdS crystal by two pairs of crossed laser beams. The peculiarities of FCPE signals and their possible applications are discussed.

Basic properties of radiation of a crystal lattice excited by an axial channeling particle are considered. It is shown that a coherent radiation of atoms occurs if the frequency of oscillations of the channeled particle comes to a resonance with the vibrational mode of the crystal. Spectral and angular distribution of radiation and its polarization are calculated. In case of a relativistic channeled particle, the radiation of atoms is generated into a narrow cone in the direction of a crystallographic axis along which the particle is channeling. The radiation of atoms exited at axial channelling has significant degree of circular polarization.