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Aktuelle Veranstaltungen

 

Kolloquium

Thema:

Elastic Tuning and Response of Electronic Quantum Phases

Datum:

17.01.22

Uhrzeit:

16:15

Ort:

cyberspace

Vortragender:

Prof. Roser Valenti

Goethe-Universität Frankfurt am Main

Inhalt:

Critical elasticity, superelasticity, nematicity with extreme lattice softening, or strain-tuning of charge order, magnetism and superconductivity are a few of the fascinating recent developments in condensed matter physics that demonstrate the extreme electronic sensitivity of quantum materials to elastic deformations. Such phenomena are desirable to create, for instance, new functionalities that enable interfacing between mechanical and electronic properties. In this talk I will present some examples and discuss how, in a joint collaboration between theorists and experimentalists, we tailor advanced quantum materials with exceptional mechanical responsiveness by a combination of theoretical materials' design, and novel approaches to mechanically manipulate and control electronic systems.

Ansprechpartner:

J. Schnack

Kolloquium Mathematische Physik

Thema:

20220506-Volker Bach-TBC

Datum:

06.05.22

Uhrzeit:

16:15

Ort:

ZOOM/Konferenzschaltung

Vortragender:

Volker Bach

Technische Universität Braunschweig

Inhalt:

TBC

Ansprechpartner:

M. Baake

Seminar Hochenergiephysik

Thema:

Quantum-to-Classical Transition of Adiabatic and Entropy Perturbations in the Presence of an Axion-like Particle

Datum:

20.01.22

Uhrzeit:

14:15

Ort:

D6-135

Vortragender:

Jondalar Kuß

Universität Bielefeld

Inhalt:

In my master´s thesis at Göttingen University I studied the effect that an axion-like particle being present during inflation as a light scalar field could have on the primordial perturbations, using the formalism of squeezed states. The axionic field becomes highly squeezed during inflation and remains so after reheating. Initially, it merely produces isocurvature perturbations, curvature is only sourced when the Hubble parameter becomes comparable to the axion mass.

Ansprechpartner:

D. Bödeker

Seminar Kondensierte Materie

Thema:

tba

Datum:

20.01.22

Uhrzeit:

14:15

Ort:

Hybrid - Zoom/D5-153

Vortragender:

Paul Angelike

Universität Bielefeld

Inhalt:

Ansprechpartner:

Peter Reimann

Seminar Mathematische Physik

Thema:

On Non-Hermitian Beta-Ensembles

Datum:

14.10.21

Uhrzeit:

16:00

Ort:

D5-153

Vortragender:

Patricia Päßler

Universität Bielefeld

Inhalt:

Log-gases with inverse temperature beta are systems with many applications in physics, for example in the theory of superconductors or the fractional quantum Hall effect. For some specific values of beta a correspondence to random matrix theory (RMT) is well established. The advantage of this connection is the usage of the RMT methods in the study of those systems. The goal of this talk is the discussion of Log-gases in two dimensions, i.e. in the non-Hermitian case, for more general values of the inverse temperature. Therefore, we study in the first part a model of normal 2 × 2 matrices with beta in [0,2] and discuss whether we find a surmise for the nearest-neighbour spacing distribution of large matrices. In the second part of the talk we introduce the study of symmetry classes in non-Hermitian RMT. We conjecture that the classes of complex symmetric and complex quaternion matrices can be effectively described by Log-gases in two dimensions with non-integer inverse temperatures.

Ansprechpartner:

Gernot Akemann

Seminar AG Zufallsmatrizen

Thema:

20220119-JonasJalowy-TBC

Datum:

19.01.22

Uhrzeit:

09:00

Ort:

ZOOM / Konferenzschaltung

Vortragender:

Jonas Jalowy

Westfälische Wilhelms-Universität Münster

Inhalt:

Ansprechpartner:

Gernot Akemann



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  • | Letzte Änderung: 23.11.2011
  •  Olaf Kaczmarek
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