Casimir energy of finite width mirrors: renormalization, self-interaction limit and Lifshitz formula

We study the field theoretical model of a scalar field in presence of spacial inhomogeneities in form of one and two finite width mirrors (material slabs). The interaction of the scalar field with the defect is described with position-dependent mass term. Within this model we derive the interaction of two finite width mirrors, establish the correspondence of the model to the Lifshitz formula and construct limiting procedure to obtain finite self-energy of a single mirror without any normalization condition.Comment: 5 pages, based on the presentation on the Ninth Conference on Quantum Field Theory under the influence of External Conditions, Oklahoma, 200

Second-layer nucleation in coherent Stranski-Krastanov growth of quantum dots

We have studied the monolayer-bilayer transformation in the case of the coherent Stranski-Krastanov growth. We have found that the energy of formation of a second layer nucleus is largest at the center of the first-layer island and smallest on its corners. Thus nucleation is expected to take place at the corners (or the edges) rather than at the center of the islands as in the case of homoepitaxy. The critical nuclei have one atom in addition to a compact shape, which is either a square of i*i or a rectangle of i*(i-1) atoms, with i>1 an integer. When the edge of the initial monolayer island is much larger than the critical nucleus size, the latter is always a rectangle plus an additional atom, adsorbed at the longer edge, which gives rise to a new atomic row in order to transform the rectangle into the equilibrium square shape.Comment: 6 pages, 4 figures. Accepted version, minor change

Thermosensitization of nanostructured PbSe films

The mode and conditions of thermal sensitization in the temperature range 648-698K lead selenide films deposited from ethylendiamine acetate system were determined. The effect of heat treatment on the morphology and properties of photosensitive chemically deposited films of PbSe was showed. It is concluded that the results obtained by hydrochemical synthesis of nanostructed highly sensitive to infrared range radiation layer of lead selenide provide performance on the level of best foreign analogues

Study of the characteristics of photoresistors based on hydrochemically deposited films of Pb0.902Sn0.098Se solid solution

Experimental samples of photoresistors based on a Pb0. 902Sn0. 098Se-solid solution semiconductor films obtained by the layer-by-layer deposition of individual selenides of lead and tin(II) with subsequent thermal activation are developed. The structure and morphology of the thin-film compositions (SnSe-PbSe)2 are studied. The temperature dependences of the dark resistance, signal, noise and its ratio, as well as the frequency and spectral characteristics of photoresistors fabricated on the basis of Pb0. 902Sn0. 098Se films in the range of 205-300 K are studied. The optimal bias voltages are determined. It is shown that the location of the maximum and the right boundary of the photoresponse for Pb0. 902Sn0. 098Se-based photoresistors is shifted, in comparison with PbSe, toward the long-wavelength region by 0. 7 μm. The maximal detectivity of the studied photoresistors (2. 0 × 2. 0 mm) obtained at 230 K was 9 × 109 cm W-1 Hz1/2. The advantages of using the Pb0. 902Sn0. 098Se-based photoresistors in the spectral range of 3. 0-5. 5 μm compared with PbSe-based ones are shown. © 2013 Pleiades Publishing, Ltd