archive-rs.com » RS » S » SCL.RS

Total: 601

Choose link from "Titles, links and description words view":

Or switch to "Titles and links view".
  • SCL seminar by Marko Mladenovic
    have a low processing cost However devices made of organic semiconductors still have relatively low charge mobility and low efficiency Thin films of crystalline organic semiconductors have a polycrystalline form which is composed of many different crystalline grains Previous works indicate that grain boundaries are the most limiting intrinsic factor for efficient charge transport in small molecule based polycrystalline organic semiconductors We have investigated the influence of grain boundaries on electronic properties of polycrystalline organic semiconductor naphthalene Atomic structure of grain boundaries was found using a Monte Carlo method while electronic structure calculations were performed using the density functional theory based charge patching method We found that grain boundaries introduce trap states within the band gap of the material Wave functions of these states are localized on closely spaced pairs of molecules from opposite sides of the boundary The energies of trap states are strongly correlated with the distances between the molecules in the pair These findings were used to calculate the electronic density of trap states which was found to exhibit a qualitatively different behavior for grain boundaries perpendicular to the a and b direction of the naphthalene unit cell 1 1 M Mladenovic N Vukmirovic and I E

    Original URL path: http://www.scl.rs/news/869-scl-seminar-by-marko-mladenovic (2016-02-10)
    Open archived version from archive

  • SCL seminar by Igor Stankovic
    of an internal combustion engine Also current efforts and methods used for engine efficiency improvement research will be presented with special attention on simulation methods and challenges of chemical reaction introduction into computational fluid dynamics In the second part of the lecture non equilibrium molecular dynamics simulations will be presented of fuel droplet surrounded by air in a spatially and temporally evolving environment A numerical procedure is developed to include chemical reactions into molecular dynamics The model reaction is chosen to allow investigation of the position of chemical reactions and the behavior of typical products alcohols and aldehydes A liquid droplet at molecular scale is seen as a network of fuel molecules interacting with oxygen nitrogen and products of chemical fuel breakdown A molecule is evaporating when it loosens from the network and diffuses into the air Naturally fuel molecules from the gas phase oxygen and nitrogen molecules can also be adsorbed in the reverse process into the liquid phase Thus in the presented simulations the time and length scales of transport processes oxygen adsorption diffusion and fuel evaporation are directly determined by molecular level processes and not by model constants News 12 February 2016 SCL Seminar by Jelena Smiljanic

    Original URL path: http://www.scl.rs/news/873-scl-seminar-igor-stankovic (2016-02-10)
    Open archived version from archive

  • SCL seminar by Aleksandar Cvetkovic
    for the complex measures Speed of convergence is analyzed and some bounds are presented Second part of the lecture is concerned with the construction and existence of different variations of the Gaussian quadrature rules connected with the interval quadrature rules and general theory presented for the operator modified function values Third part is connected with motivation for the quadrature rules using Muntz systems as well as some presentation of the

    Original URL path: http://www.scl.rs/news/875-scl-seminar-by-aleksandar-cvetkovic (2016-02-10)
    Open archived version from archive

  • SCL seminar by Marina Marinkovic
    problem in QCD and keep full control over the systematic errors In this talk we will present a non perturbative computation of the running of N f 4 QCD coupling with four flavours of O a improved Wilson fermions and Wilson plaquette action We check that cutoff effects in the step scaling function are weak by taking one more resolution compared to a previous computation Finally we shall show an

    Original URL path: http://www.scl.rs/news/876-scl-seminar-by-marina-marinkovic (2016-02-10)
    Open archived version from archive

  • SCL Seminar by Zlatko Papic
    was recognized early on as one of the fundamental aspects of quantum mechanics entanglement has played an increasingly important role in condensed matter physics as well in particular due to the fact that it underlies the recent tensor network description of many body systems and through its practical uses as a resource for quantum computing In this talk I will illustrate the profound role of the entanglement in two rather different types of physical systems the topological phases arising in the context of the fractional quantum Hall effect and the quantum disordered systems in a many body localized phase I will show that the entanglement provides a way to understand the structure of the topologically ordered ground states via a direct link between conformal field theory solvable models and the matrix product state formalism Furthermore I will demonstrate that the entanglement also provides specific signatures for the non equilibrium dynamics of disordered systems and determines the nature of the eigenstates in the many body localized phase which may have important consequences for controlling the coherence of isolated quantum systems in experiment News 12 February 2016 SCL Seminar by Jelena Smiljanic 12 January 2016 In memoriam Nikola Buric 28 December 2015

    Original URL path: http://www.scl.rs/news/877-scl-seminar-by-zlatko-papic (2016-02-10)
    Open archived version from archive

  • SCL Seminar by Nikola Prodanovic
    like transport We developed an accurate model accounting for electron phonon interaction in colloidal quantum dot supercrystals that allowed us to identify the nature of charge carriers and the electrical transport regime We find that in experimentally relevant CdSe nanocrystal solids the electron phonon interaction is sufficiently strong that small polarons localized to single dots are formed Charge carrier transport occurs by small polaron hopping between the dots with mobility

    Original URL path: http://www.scl.rs/news/882-scl-seminar-by-nikola-prodanovic (2016-02-10)
    Open archived version from archive

  • SCL Seminar by Ivana Vasic
    supersolid phases that are ground states of an extended Bose Hubbard Hamiltonian To this end we will solve the master equation using the Gutzwiller approximation and find that in the usual homogeneous superfluid phase repulsive interactions lead to enhanced dissipation process On the other hand our mean field approach indicates that the effective loss rates are significantly suppressed deep in the supersolid phase where repulsive nearest neighbour interactions play a

    Original URL path: http://www.scl.rs/news/883-scl-seminar-by-ivana-vasic (2016-02-10)
    Open archived version from archive

  • SCL Seminar by Tao Wang
    how to experimentally realize a Kagome superlattice system where an anisotropic superfluidity should emerge due to two faces of an interaction blockade Afterwards we will discuss in detail an optical lattice system where the s wave scattering length is modulated periodically 3 Motivated by the Floquet theory 4 we will show that for large enough driving frequencies the original time dependent Bose Hubbard Hamiltonian is well approximated by an effective time independent Bose Hubbard model We can even conclude that the driven many body system must have the same critical exponents as the much simpler non driven lattice system provided that the driving amplitude is not too large Finally we will present initial results of calculation of the ground state energy of the Bose Hubbard model to high orders by invoking the process chain approach 5 In the outlook we will discuss the prospects of using the process chain approach for analyzing artificially tuned optical lattices 1 F E A Santos and A Pelster Phys Rev A 79 013614 2009 2 T Wang X F Zhang S Eggert and A Pelster Phys Rev A 87 063615 2013 3 A Rapp X Deng and L Santos Phys Rev Lett 109 203005

    Original URL path: http://www.scl.rs/news/884-scl-seminar-by-tao-wang (2016-02-10)
    Open archived version from archive