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Colloquium

Topic:

Controlling nanomaterials and their interfaces for biology applications

Date:

17.12.18

Time:

16:15

Place:

H6

Guest:

Prof. Jean-Francois Berret

Laboratoire Matie?re et Syste?mes Complexes, UMR 7057 CNRS Universite? Denis Diderot Paris-VII

Abstract:

Engineered nanomaterials are essential components in the development of nanotechnologies. In this lecture, I will discuss the use of nanomaterials, including nanoparticles for applications in nanomedicine and biophysics. I will provide examples of particles used as diagnostic and therapeutic agents for the treatment of major diseases. I will also talk about inhaled pollution particles emitted by industrial activities and about their impact on human health. On the physical chemistry side, emphasis will be put on strategies developed in my group to control particle interfaces. It is now recognized that these interfaces determine for a significant part their fate in biological environments. Finally, I will show how in some conditions particles can be translated into nano- and microdevices and manipulated to allow the measurements of physical quantities of biological materials (such as viscosity and elasticity).

Contact person:

W. Pfeiffer

Colloquium Mathematical Physics

Topic:

tba

Date:

01.02.19

Time:

16:15

Place:

U2-228

Guest:

Martin Zirnbauer

University of Cologne

Abstract:

Contact person:

G. Akemann

Seminar High Energy Physics

Topic:

Extracting topology from lattice QCD near Tc

Date:

18.12.18

Time:

14:15

Place:

D6-135

Guest:

Rasmus Larsen

BNL, Upton, NY, USA

Abstract:

We report our study on the properties of the topological structures present in the QCD medium around the critical temperature Tc. We use dynamical domain wall fermion configurations on lattices of size $32^3x8$ and detect the topological structures through the zero modes of the overlap operator. We explicitly show that the properties of the zero modes of the QCD Dirac operator agrees well with that of calorons with non-trivial holonomy. Different profiles of the zero modes are observed, and when we change the boundary condition of the overlap operator in the temporal direction, the zero mode moves to another location . All of this indicates the presence of instanton-dyons in the hot QCD medium around Tc, where the distance between dyons control the shape and extent of the zero modes.

Contact person:

Ch. Schmidt

Seminar Condensed Matter

Topic:

Equilibration of expectation values for statically and dynamically generated initial conditions

Date:

14.12.18

Time:

14:15

Place:

D2-240

Guest:

Christian Bartsch

Universität Osnabrück

Abstract:

We investigate dynamical equilibration of expectation values in closed quantum systems for realistic non-equilibrium initial states. For statically generated initial states we find that the long time expectation values depend on the initial expectation values if eigenstate thermalization is violated. An analytical expression for the deviation from the expected ensemble value is derived for small displacements from equilibrium based on linear response theory. Analogous derivations show that this deviation vanishes for dynamically generated initial states, at least within the linear response regime. Additional numerics for magnetization and energy equilibration in an asymmetric anisotropic spin-1/2-ladder illustrate the behavior beyond linear response for both cases.

Contact person:

Peter Reimann

Seminar Mathematical Physics

Topic:

tba

Date:

20.12.18

Time:

15:00

Place:

D5-153

Guest:

Yanik-Pascal Foerster

Bielefeld University

Abstract:

Contact person:

Gernot Akemann

Seminar AG Zufallsmatrizen

Topic:

The level spacing distribution at the hard edge

Date:

28.11.18

Time:

16:15

Place:

V3-201

Guest:

Valentin Gorski

Bielefeld University

Abstract:

The level spacing distribution in the bulk of a spectrum is approximately given by the Wigner surmise. Yet, at the hard and the soft edge one can expect strong deviations from these laws. Using the orthogonal polynomial method we derive the spacing distribution of the smallest two singular values of the chiral Gaussian unitary ensemble (chGUE) at finite matrix dimension with additional characteristical polynomials in the weight. The number of these polynomials represents the number of flavors (types of quarks) in the physical system. This ensemble approximates the Euclidean Dirac operator in Quantum Chromodynamics (QCD). In my talk, I will report on the behavior of the level spacing distribution in this particular setting.

Contact person:

Gernot Akemann



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  • | Letzte Änderung: 23.11.2011
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