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Nizhny Novgorod, Russia

Lobachevsky State University of Nizhni Novgorod - National Research University , also known as Lobachevsky University, was established in 1916 as a People's University.In 1918 it became the first State Higher EducationalInstitution of Soviet Russia. From 1932 to 1956, its name was State University of Gorky – from 1932 to 1990 the city of Nizhny Novgorod was known as Gorky – and from 1956 to 1990 the Lobachevsky State University of Gorky after great Russian mathematician Nikolai Lobachevsky. The University has provided the basis for the development of higher education and a fundamental research system in the Nizhni Novgorod region. Today UNN is one of the leading classical research universities in Russia and the winner of all the major recent Russian higher education competitive programmes. In 2009 Russian Government awarded the University with the honorable status of National Research University. UNN provides quality education to over 30000 undergraduate & graduate students and 1000 postgraduates. The University staff comprises over 1200 Candidates of science and over 450 Doctors of science. International students from more than 65 countries of the world choose UNN.The University is renowned for innovation in the fields of research and higher education. As a result, UNN's scientific and pedagogical schools have won international recognition for their excellence. The continual development of these schools ensures the high standard of UNN's educational activity as a research university. The University aims to respond in an effective manner to new and evolving scientific and educational challenges. The University has concentrated its research efforts through the creation of large research institutes that focus on work in cutting-edge fields. The University also continuously engages in multifaceted interaction with various branches of the economy.UNN is actively involved in cooperation with foreign partners, it has won many international awards and works in close connection with various Russian and foreign companies . The University is also a member of the Association of Russian Leading Universities and European University Association .UNN is placed 20th among CIS & Baltic universities and ranked 74 by the QS World University Ranking BRICS, having five QS Stars for Excellence in Teaching, Employability, Innovation, and Facilities. UNN is one of only 15 Russian universities awarded in 2013 with a prestigious grant of the Government of the Russian Federation to implement the Leading Universities International Competitiveness Enhancement Programme. Wikipedia.

Bakunov M.I.,Nizhny Novgorod State Technical University | Bodrov S.B.,RAS Institute of Applied Physics
Journal of the Optical Society of America B: Optical Physics

We present a detailed analysis of terahertz generation with tilted-front optical pulses in a scheme, where the pulsefront tilt is introduced by transmitting the laser pulse through a diffraction grating placed on the boundary of an electro-optic crystal. The analysis accounts for a finite transverse size of the pump laser beam, initial chirp of the laser pulse, and distortion of the tilted-front pulse in the crystal due to angular and material dispersion. Two situations of practical interest are explored-LiNbO3 pumped at 0.8 μm wavelength and GaAs pumped at 1.8 μm. Recommendations on increasing the efficiency of the optical-to-terahertz conversion, optimizing the generated terahertz spectrum, and improving the quality of the terahertz beam are given. © 2014 Optical Society of America. Source

Denisov S.,Sumy State University | Denisov S.,University of Augsburg | Denisov S.,Nizhny Novgorod State Technical University | Flach S.,Massey University | And 2 more authors.
Physics Reports

Transport properties of particles and waves in spatially periodic structures that are driven by external time-dependent forces manifestly depend on the space-time symmetries of the corresponding equations of motion. A systematic analysis of these symmetries uncovers the conditions necessary for obtaining directed transport. In this work we give a unified introduction into the symmetry analysis and demonstrate its action on the motion in one-dimensional periodic, both in time and space, potentials. We further generalize the analysis to quasi-periodic drives, higher space dimensions, and quantum dynamics. Recent experimental results on the transport of cold and ultracold atomic ensembles in ac-driven optical potentials are reviewed as illustrations of theoretical considerations. © 2014 Elsevier B.V. Source

Maslov A.V.,Nizhny Novgorod State Technical University
Optics Letters

Resonant propulsion of small nonresonant particles inside metal waveguides due to the formation of resonant states by the guided modes below their cutoffs has been predicted in the past. Here it is shown that stable resonant propulsion exists in hollow-core photonic crystal fibers, which are all-dielectric structures and are a major platform for various photonic applications. Specific features of the resonant propulsion are discussed together with the fiber design issues. The results may enable power-efficient transport of particles over long distances, particle sorting, and sensitive detection. © 2016 Optical Society of America. Source

Maslov A.V.,Nizhny Novgorod State Technical University
Physical Review Letters

It is predicted that the optical force experienced by a dielectric particle excited resonantly by a surface wave can be directed opposite to the incident power flow when the exciting wave is a backward one. This is consistent with the electromagnetic momentum flow of the backward wave being directed opposite to the power flow. The magnitude of the force can be comparable to the momentum flow of the surface wave. Such forces bring a deeper understanding of the electromagnetics of backward surface waves and can be used in integrated photonic circuits and optofluidic devices. © 2014 American Physical Society. Source

Kalenkov M.S.,Nizhny Novgorod State Technical University | Zaikin A.D.,Karlsruhe Institute of Technology | Kuzmin L.S.,Chalmers University of Technology
Physical Review Letters

We argue that parametrically strong enhancement of a thermoelectric current can be observed in conventional superconductors doped by magnetic impurities. This effect is caused by the violation of the symmetry between electronlike and holelike excitations due to formation of subgap bound Andreev states in the vicinity of magnetic impurities. We develop a quantitative theory of this effect and demonstrate that it can be detected in modern experiments. © 2012 American Physical Society. Source

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