Periodically driving a many-body localized quantum system

We experimentally study a periodically driven many-body localized system realized by interacting fermions in a one-dimensional quasi-disordered optical lattice. By preparing the system in a far-from-equilibrium state and monitoring the remains of an imprinted density pattern, we identify a localized phase at high drive frequencies and an ergodic phase at low ones. These two distinct phases are separated by a dynamical phase transition which depends on both the drive frequency and the drive strength. Our observations are quantitatively supported by numerical simulations and are directly connected to the change in the statistical properties of the effective Floquet Hamiltonian.We acknowledge support from Technical University of Munich - Institute for Advanced Study, funded by the German Excellence Initiative and the European Union FP7 under grant agreement 291763, from the DFG grant no. KN 1254/1-1, the European Commission (UQUAM, AQuS) and the Nanosystems Initiative Munich (NIM)

CSD2005_3e_14

Abstract Effect of air industrial emissions of the main industrial hubs of Buryatia on the pine forests in watercollecting area of the Lake Baikal has been studied. Contamin ation of forest stands is estimated from accumulation of sulphur, a priority pollutant element, in needles of Scotch pine. Depending on the distance from sources of industrial emissions, zones of variable intensity of forest pollution are distinguished. The highest correlations between the sulphur content of needles and morphometry parameters of trees are revealed in the zone of severe pollution

CSD2005_3e_5pmd

Abstract Optimization of conditions for obtaining of tanning agents, anthocyanidin dyes, and enterosorbents from bast of a birch bark has been performed. By choosing the appropriate conditions for alkali treatment of a porous fixed residue from extraction processing of bast, enterosorbent was produced, which has exhibited high efficiency when treating acute intestin al infections in animals and dysbacterioses that were caused by application of antibiotics. The comprehensive processing of bast of a birch bark makes it possible to produce about 3 % of resinous matter, 35-40 % of polyphenolic products, 13-15 % of anthocyanidin dye, and about 40 % of enterosorbent