Dynamic equation for quantum Hall bilayers with spontaneous interlayer coherence: The low-density limit

The bilayer systems exhibit the Bose-Einstein condensation of excitons that emerge due to Coulomb pairing of electrons belonging to one layer with the holes belonging to the other layer. Here we present the microscopic derivation of the dynamic equation for the condensate wave function at a low density of electron-hole ($e-h$) pairs in a strong magnetic field perpendicular to the layers and an electric field directed along the layers. From this equation we obtain the dispersion law for collective excitations of the condensate and calculate the electric charge of the vortex in the exciton condensate. The critical interlayer spacing, the excess of which leads to a collapse of the superfluid state, is estimated. In bilayer systems with curved conducting layers, the effective mass of the $e-h$ pair becomes the function of the $e-h$ pair coordinates, the regions arise, where the energy of the $e-h$ pair is lowered (exciton traps), and lastly $e-h$ pairs can gain the polarization in the basal plane. This polarization leads to the appearance of quantized vortices even at zero temperature.Comment: 8 page

Order parameter phase locking as a cause of a zero bias peak in the differential tunneling conductance of bilayers with electron-hole pairing

In n-p bilayer systems an exotic phase-coherent state emerges due to Coulomb pairing of n-layer electrons with p-layer holes. Unlike Josephson junctions, the order parameter phase may be locked by matrix elements of interlayer tunneling in n-p bilayers. Here we show how the phase locking phenomenon specifies the response of the electron-hole condensate to interlayer voltages. In the absence of an applied magnetic field, the phase is steady-state (locked) at low interlayer voltages, V<V_c, however the phase increases monotonically with time (is unlocked) at V>V_c. The change in the system dynamics at V=V_c gives rise to a peak in the differential tunneling conductance. The peak width V_c is proportional to the absolute value of the tunneling matrix element |T_{12}|, but its height does not depend on |T_{12}|; thus the peak is sharp for small |T_{12}|. A sufficiently strong in-plane magnetic field reduces considerably the peak height. The present results are in qualitative agreement with the zero bias peak behavior that has recently been observed in bilayer quantum Hall ferromagnets with spontaneous interlayer phase coherence.Comment: 6 pages, extended version, phenomenological derivation of the main equation is added, references are adde

Родственная трансплантация почки - первый опыт в клинической больнице Святителя Луки

Kidney transplantation (KT) is regarded as the most effective therapeutic approach for people with end-stage renal disease. However, for a number of reasons - constant increase in the incidence of diseases contributing to formation and development of chronic kidney disease, as well as continuing shortage of donor organs - 78-95% of patients in need of a kidney transplant do not receive the necessary treatment, and the waiting list stretches for several years. This paper presents the first outcomes of KT for chronic glomerulonephritis performed at St. Luke’s Clinical Hospital in St. Petersburg, in collaboration with the staff of Shumakov National Medical Research Center of Transplantology and Artificial Organs. Трансплантация почки является наиболее эффективным видом медицинской помощи пациентам с терминальной почечной недостаточностью. Однако по ряду причин (постоянное увеличение частоты встречаемости заболеваний, способствующих формированию и развитию хронической болезни почек, а также сохраняющийся дефицит донорских органов) 78-95% пациентов, нуждающихся в пересадке почки, не получают необходимого лечения, а очередь в листах ожидания растягивается на несколько лет. В статье в виде клинического случая представлены первые результаты родственной трансплантации почки при хроническом гломерулонефрите, проведенной в СПб ГБУЗ «Клиническая больница Святителя Луки» совместно с сотрудниками ФГБУ «НМИЦ ТИО им. ак. В.И. Шумакова» Минздрава России

On properties of the space of quantum states and their application to construction of entanglement monotones

We consider two properties of the set of quantum states as a convex topological space and some their implications concerning the notions of a convex hull and of a convex roof of a function defined on a subset of quantum states. By using these results we analyze two infinite-dimensional versions (discrete and continuous) of the convex roof construction of entanglement monotones, which is widely used in finite dimensions. It is shown that the discrete version may be 'false' in the sense that the resulting functions may not possess the main property of entanglement monotones while the continuous version can be considered as a 'true' generalized convex roof construction. We give several examples of entanglement monotones produced by this construction. In particular, we consider an infinite-dimensional generalization of the notion of Entanglement of Formation and study its properties.Comment: 34 pages, the minor corrections have been mad

Polish-Russian relations after the death of President Lech Kaczynski

Bakalářská práce se zabývá polsko- ruskými vztahy po smrti presidenta Lecha Kaczyńského. Práce je vypracována rámcovou analýzou, která je založena na sběru kvalitativních dat. Důležitým aspektem vztahů, který je popsán, je událost jenž se stala 10.4. 1940 v Katyni. Dalším takovým bodovým zlomem je letecká nehoda která se stala v roce 2010, kde zemřel polský president a mnoho dalších vládních činitelů.Katedra politologie a mezinárodních vztahůNeobhájenoBachalory project is about Polish-Russian relations after the death of President Lech Kaczynski. The work is developed framework analysis, which is based on qualitative data collection. An important aspect of relationship both of nations, which is described, is an event which became 4.10 1940 in Katyn. Another such spot is break accident, which happened in April 2010, where died Polish president and many other government officials

The role of the OSCE in addressing national and ethnic conflicts in Eastern Europe

Tato práce analyzuje roli OBSE při řešení národnostních a etnických konfliktů v Estonsku a MoldavskuKatedra politologie a mezinárodních vztahůObhájenoThis bachaler thesis analyses the role of the OSCE in addressing national and ethnic conflicts in Estonia and Moldavia