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- SCL Seminar by Miljan Dasic

of the Institute of Physics Belgrade Miljan Dašić will present his recent results in a seminar talk entitled Investigation of relations between the binding energy and structure in helices composed of magnetic particles News 12 February 2016 SCL Seminar by Jelena Smiljanic 12 January 2016 In memoriam Nikola Buric 28 December 2015 SCL Seminar by Milos Radonjic 25 December 2015 SCL Seminar by Milan Radonjic 18 December 2015 SCL Seminar

Original URL path: http://www.scl.rs/news/949-scl-seminar-by-miljan-dasic (2016-02-10)

Open archived version from archive - SCL Seminar by Veljko Jankovic

carrier Such approaches therefore assume that carriers are in equilibrium and that they are only slightly perturbed by external alternating electric field In 1 we obtain the expression for the optical conductivity in a material with localized electronic states and weak electron phonon or electron impurity interaction which is valid for any nonequilibirum state of the electronic subsystem prior to the action of electric field Particularly in the case of incoherent nonequilibrium state of the electronic subsystem the optical conductivity is entirely expressed in terms of the positions of electronic states their nonequilibrium populations and Fermi s golden rule transition probabilities between the states The same mathematical form of the expression is valid both in the case of electron phonon and electron impurity interaction Moreover our result for the nonequilibrium optical conductivity has the same form as the expressions previously obtained for the case of equilibrium Our results are expected to be valid at sufficiently high frequencies such that the period of the electric field is much smaller than the carrier relaxation time We apply the derived expressions to two model systems a simple one dimensional Gaussian disorder model and the model of a realistic three dimensional organic polymer material

Original URL path: http://www.scl.rs/news/950-scl-seminar-by-veljko-jankovic (2016-02-10)

Open archived version from archive - IPB Colloquium by Dejan Stojkovic

a pure state While Hawking s leading order density matrix contains only the diagonal terms we calculate the off diagonal correlation terms These correlations start very small but then grow in time The cumulative effect is that the correlations become comparable to the leading order terms and significantly modify the density matrix While the trace of the Hawking s density matrix squared goes from unity to zero during the evolution

Original URL path: http://www.scl.rs/news/952-ipb-colloquium-by-dejan-stojkovic (2016-02-10)

Open archived version from archive - SCL Seminar by Vladimir Dobrosavljevic

by geometric frustration for electrons on quarter filled triangular lattices in the classical limit Important consequences include the stabilization of a stripe ordered crystalline global ground state but also the emergence of very many low lying metastable states with amorphous stripe glass spatial structures 2 Melting of the stripe order thus leads to a frustrated Coulomb liquid at intermediate temperatures showing remarkably slow viscous dynamics with very long relaxation times growing in Arrhenius fashion upon cooling as typical of strong glass formers On shorter time scales the system falls out of equilibrium and displays the aging phenomena characteristic of super cooled liquids around the glass transition Our results show remarkable similarity with the recent observations 3 4 of charge glass behavior in ultra clean triangular organic materials of the θ BEDT TTF family 1 S Mahmoudian L Rademaker A Ralko S Fratini V Dobrosavljević submitted to Phys Rev Lett preprint arXiv 1412 4441 2 J Schmalian and P G Wolynes Phys Rev Lett 85 836 2000 3 F Kagawa T Sato K Miyagawa K Kanoda Y Tokura K Kobayashi R Kumai and Y Murakami Nat Phys 9 422 2013 4 H Oike F Kagawa N Ogawa A Ueda H Mori

Original URL path: http://www.scl.rs/news/956-scl-seminar-by-vladimir-dobrosavljevic (2016-02-10)

Open archived version from archive - SCL Seminar by Stefan Milenkovic

Serbian Sec A молекуларни мотор је катализатор ATP хидролизе који користи њену енергију за транспорт новосинтетизованих протеина изван бактерије мењајући драматично своју конформацију Иако детаљно проучаван експериментално са обиљем кристалографских и кинетичких података процес хемијско механичког спрезања у SecA је и даље неразјашњен Применом атомистичких MD симулација и анализом добијених трајекторија ми покушавамо да дођемо до релевантних закључака у вези једног од фундаменталних процеса у природи News 12 February 2016

Original URL path: http://www.scl.rs/news/957-scl-seminar-by-s-milenkovic (2016-02-10)

Open archived version from archive - IPB Colloquium by Caslav Brukner

Physics Belgrade Prof Dr Časlav Brukner University Professor at University of Vienna and Director of the Institute for Quantum Optics and Quantum Information IQOQI Vienna will present a colloquium talk entitled Quantum clocks and decoherence due to time dilation News 12 February 2016 SCL Seminar by Jelena Smiljanic 12 January 2016 In memoriam Nikola Buric 28 December 2015 SCL Seminar by Milos Radonjic 25 December 2015 SCL Seminar by Milan

Original URL path: http://www.scl.rs/news/958-ipb-colloquium-by-caslav-brukner (2016-02-10)

Open archived version from archive - SCL Seminar by Jelena Grujic

interaction game theory is usually studied in the limit of very few strategies Here we study replicator dynamics with extinctions and mutations on a large game with many strategies We perform numerical simulations of a game where each player can play one of a large number of strategies The game is defined with a payoff matrix whose elements are random numbers which can be positive or negative with majority being zero At the beginning of the simulation we choose randomly a small number of strategies to be played Reproduction of players is done according to the replicator equation in which a small amount of mutations is introduced In this way new strategies can appear in the system Additionally we introduce an extinction threshold strategies with a frequency less than this threshold are removed from the system The resulting behaviour shows complex characteristics similar to those of the Tangled Nature model The dynamics has two types of phases a quasi stable phase in which the number of used strategies is more or less constant and hectic phases where creation and extinct of strategies happens at a high rate We conclude that the complex behaviour of the Tangled Nature model which is

Original URL path: http://www.scl.rs/news/959-scl-seminar-jelena-grujic (2016-02-10)

Open archived version from archive - IPB Colloquium by Nemanja Kaloper

on the title of the famous Gauguin painting on exhibit in the Museum of Fine Arts in Boston Where does the Universe come from What is the Universe Where is the Universe going These questions appear to be distinct and independent queries about the past present and future of the universe Yet our attempts to answer them all share a crucial common ingredient vacuum energy or cosmological constant Indeed vacuum energy plays key role in driving inflation in dominating the present universe and if it is here to stay forever in fully controlling the cosmic future Yet we still do not comprehend vacuum energy dynamics and we continue to stumble searching for a mechanism to control its scale In this talk I will discuss the problems and go over a recent proposal how to sequester vacuum energy by a very minimal modification of gravitational dynamics The implications of the mechanism are rather surprising if it is the way how nature works then the universe must end it must collapse some time in the future the current dark energy which dominates is just a transient and its spatial geometry is not flat but instead a three dimensional sphere Therefore the cosmic

Original URL path: http://www.scl.rs/news/960-ipb-colloquium-by-nemanja-kaloper (2016-02-10)

Open archived version from archive