Topic: |
Controlling nanomaterials and their interfaces for biology applications |
Date: |
17.12.18 |
Time: |
16:15 |
Place: |
H6 |
Guest: |
|
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: |
Topic: |
tba |
Date: |
01.02.19 |
Time: |
16:15 |
Place: |
U2-228 |
Guest: |
|
University of Cologne |
|
Abstract: |
|
Contact person: |
Topic: |
Extracting topology from lattice QCD near Tc |
Date: |
18.12.18 |
Time: |
14:15 |
Place: |
D6-135 |
Guest: |
|
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: |
Topic: |
tba |
Date: |
24.01.19 |
Time: |
14:15 |
Place: |
D5-153 |
Guest: |
Oliver Waldmann |
Universitaet Freiburg |
|
Abstract: |
|
Contact person: |
Topic: |
Eigenvector correlations for quaternionic Ginibre ensembles |
Date: |
20.12.18 |
Time: |
15:00 |
Place: |
D5-153 |
Guest: |
Yanik-Pascal Foerster |
Bielefeld University |
|
Abstract: |
Non-Hermitian matrices feature distinct left and right eigenvectors, neither of which forms an orthonormal system, while both sets together satisfy bi-orthogonality. It was suggested by Chalker and Mehlig in 2000 to study the statistics of eigenvector overlaps, in particular their correlation functions. For complex Ginibre ensembles they obtained one-point and two-point eigenvector correlations via Schur decomposition for finite $N$ as well the corresponding limiting behaviour. Recently, several works by Bourgade, Dubach, and Fyodorov have brought new attention to the topic, establishing the results for the complex ensembles rigorously and deriving similar results for the real and quaternionic cases. In this talk, I will present how Chalker's and Mehlig's approach is applied to quaternionic Ginibre matrices, leading to correlation functions that can be written compactly in terms of Pfaffian determinants. Given one purely imaginary eigenvalue, the formulae simplify, enabling us to derive the limiting behaviour near the origin of the complex plane. Finally, I will report on the limiting behaviour for one-point and two-point correlation functions for eigenvalues inside the bulk, which turn out to be identical to the limits in the real and complex cases. |
Contact person: |
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: |