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Seminars - Summer term 2023

Seminar “Special problems in colloidal physics”

Location: HHU Düsseldorf, Seminarroom 25.32.O2.51
Thu 20.04.2023   Y. J. Zheng  Active Quantum Particles  14:30 s.t.
Wed 07.06.2023   I. Malhotra  Microgel particles at interfaces  14:30 s.t.
Mon 12.06.2023   E. Allahyarov  Dipole-dipole correlations and fluid-fluid transitions in a mono- and binary systems on a disk  14:30 s.t.
Thu 22.06.2023   R. Wittmann  Fun with FMT  14:30 s.t.
Mon 26.06.2023   G.H.P. Nguyen  Growth dynamics of bacterial colonies  14:30 s.t.
Tue 04.07.2023   L. Caprini  Active granular particles  14:30 s.t.
Wed 05.07.2023   M. Klatt  How to inherit hyperuniformity  14:30 s.t.
Mon 17.07.2023   D. Breoni  Active entangled polymers  12:30 s.t.
Prof. Dr. H. Löwen


Seminar “Special problems in computer simulation of soft matter”

Location: HHU Düsseldorf, Seminarroom 25.32.O2.51
Thu 20.04.2023   Y. J. Zheng  Active Quantum Particles  14:30 s.t.
Wed 07.06.2023   I. Malhotra  Microgel particles at interfaces  14:30 s.t.
Mon 12.06.2023   E. Allahyarov  Dipole-dipole correlations and fluid-fluid transitions in a mono- and binary systems on a disk  14:30 s.t.
Mon 26.06.2023   G.H.P. Nguyen  Growth dynamics of bacterial colonies  14:30 s.t.
Mon 03.07.2023   S. Ghosh  Accelerated Construction of Kinetic Network Model for Biomolecular Simulations  14:30 s.t.
Tue 04.07.2023   L. Caprini  Active granular particles  14:30 s.t.
Mon 17.07.2023   D. Breoni  Active entangled polymers  12:30 s.t.
Prof. Dr. J. Horbach


Seminar “Soft Matter”

Location: HHU Düsseldorf, Seminarroom 25.32.O2.51
Tue 04.07.2023   Prof. Grzegorz Szamel  Colorado State University, USA  15:30 s.t.
An alternative dynamic density functional theory for time-dependent density fluctuations in glass-forming fluids
Mon 26.06.2023   Alexander Antonov  Universität Osnabrück  16:00 s.t.
Brownian particle transport in periodic structures
Fri 23.06.2023   Antik Bhattacharya  TIFR Hyderabad, India  11:30 s.t.
Active Hamiltonian Dynamics
Fri 16.06.2023   Rashmi Priya  TIFR Hyderabad, India  11:30 s.t.
Understanding the ferroelectric phase of a liquid crystalline system using elongated molecules
Wed 14.06.2023   Prof. Bill van Megen  RMIT, Australia  15:00 s.t.
Non-stationary processes: aging and crystallisation
Fri 09.06.2023   Prof. Bill van Megen  RMIT, Australia  13:00 s.t.
Local rattling and phonons
Tue 06.06.2023   Prof. Apratim Chatterji  IISER Pune, India  14:30 s.t.
Topology driven spatial organization of DNA-ring polymers under confinement
Mon 05.06.2023   Prof. Bill van Megen  RMIT, Australia  15:00 s.t.
What is caging?
Thu 01.06.2023   Danilo B. Liarte  ICTP South American Institute for Fundamental Research and IFT-UNESP, Brazil  14:30 s.t.
Geometry, topology, and soft matter: Smectics, disordered elastic systems
Wed 31.05.2023   Vikki Anand Varma  Indian Institute of Technology, Delhi, India  14:30 s.t.
Shape Anisotropic Particles: Dynamics and Self Assembly
Wed 03.05.2023   Vincent Debets  Eindhoven University of Technoloy, The Netherlands  14:30 s.t.
Competing length and time scales in active glassy fluids
Wed 08.03.2023   Lucio Isa  Department of Materials, ETH Zurich, Switzerland  15:00 s.t.
Sliding or rolling? Characterizing single-particle contacts
Mon 09.01.2023   Iman Abdoli  Institute Theory of Polymers, Leibniz Institute for Polymer Research, Dresden  14:30 s.t.
Odd Diffusivity
Thu 05.01.2023   Alexander Houston  University of York, United Kingdom  16:00 s.t.
Active nematic multipoles: a threefold application of nematic harmonics
Thu 05.01.2023   Jonas Rønning  University of Oslo, Norway  14:00 s.t.
Dynamics of topological defects in an active nematic due to self-induced flows
Thu 05.01.2023   Kristian S. Olsen  AlbaNova Univ. Center Nordita, Stockholm, Sweden  11:00 s.t.
Non-equilibrium phenomena in confined active matter
Wed 21.12.2022   Ion Santra  Raman Research Institute, Bangalore, India  11:00 s.t.
Activity driven transport in harmonic chains
Tue 20.12.2022   Sumanta Kundu  University of Padova, Italy  14:00 s.t.
Machine Learning Predictions of Complex Polymer Topologies
Wed 14.12.2022   Simon K. Schnyder  Institute of Industrial Science, The University of Tokyo, Japan  15:30 s.t.
Cell colony dynamics and competition in a hybrid mechanochemical model
Wed 30.11.2022   Apurba Biswas  Institute of Mathematical Sciences, CIT Campus, Taramani, Chennai, India  14:30 s.t.
Mpemba effect in stochastic systems
Mon 14.11.2022   Anupam Sengupta  University of Luxembourg  16:00 s.t.
Reconfigurable Active Matter
Tue 18.10.2022   Mathias Busch  Heinrich-Heine-Universität Düsseldorf  14:00 s.t.
Investigating the link between microplastic exposure and intestinal inflammation
Tue 18.10.2022   Michael Stumpf  Heinrich-Heine-Universität Düsseldorf  15:00 s.t.
Optimized laser-induced electron injection into a Plasma Wakefield Accelerator
Tue 18.10.2022   Alex Kääpä  Bergische Universität Wuppertal  16:00 s.t.
The Galactic magnetic field and its effects on the propagation of Galactic and extragalactic cosmic rays
Tue 18.10.2022   Manuel Escobedo  Heinrich-Heine-Universität Düsseldorf  16:45 s.t.
Random and directed motion detected by indirect imaging techniques
Thu 13.10.2022   Felix Höfling  Department of Mathematics and Computer Science, FU Berlin  14:30 s.t.
Theory and simulation of liquid samples with open boundaries
Prof. Dr. Egelhaaf, Prof. Dr. Horbach, Prof. Dr. Löwen



Location: HHU Düsseldorf, Lecture Hall 5J (Building 25.31 Level 00)
Thu 22.06.2023   Prof. Dr. Thomas Speck  Universität Stuttgart  16:30 s.t.
Thu 25.05.2023   Prof. Dr. Constantin R. Schrade  Niels Bohr Institute, University of Copenhagen, Denmark  16:30 s.t.
Prof. Dr. Constantin R. Schrade: „Next-Generation Qubits in Superconducting Circuits”
Niels Bohr Institute, University of Copenhagen, Denmark - Seminar@HHUD: 25.5.23 16:30 s.t., Lecture hall 25.31 O0.5J

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Next-Generation Qubits in Superconducting Circuits
Thu 20.04.2023   Prof. Dr. Gerhard Kahl  Institut für Theoretische Physik, TU Wien, Austria  16:30 s.t.
Prof. Dr. Gerhard Kahl: „Microswimmers learning chemotaxis”
Institut für Theoretische Physik, TU Wien, Austria - Seminar@HHUD: 20.4.23 16:30 s.t., Lecture hall 25.31 O0.5J

Microorganisms which are abundant in nature and which play a key role in many biological phenomena have developed a huge variety of strategies which help them in nutrient uptake, to reproduce, to escape from predators, or to hunt prey. These strategies are realized via different manners, such as shape deformations or by the use of appendages. In an effort to understand the locomotion of these microswimmers under low Reynolds number conditions, models have been proposed, which are based on fixed swimming strategies. However, models of such organisms that adapt their swimming strategies to the ever changing surroundings have rarely been investigated, so far. I will report about a project where a simple microswimmer model is trained to swim and to uptake nutrients by combining the equations-of-motion with modern tools of machine learning. Using genetic algorithms optimized neural networks are developed which control the shape deformations of the microswimmers and allow them to navigate in static and time-dependent chemical environ-ments. By introducing noisy signal transmission in the neural networks the well-known biased run-and-tumble motion emerges, as it is known for many swimming microorganisms. Extensions of the simple model in use to more realistic microswimmers are discussed.

Microswimmers learning chemotaxis
Thu 02.02.2023   Prof. Dr. Martin Müser  Universität des Saarlandes, Saarbrücken  16:30 s.t.
Prof. Dr. Martin Müser: „Contact mechanics and its relation to empirical friction laws”
Universität des Saarlandes, Saarbrücken - Seminar@HHUD: 02.02.2023 16:30 s.t., Lecture hall 25.31 O0.5J

Empirical laws describing the friction between solids are simple, however, the microscopic origin of solid friction is generally quite complex, involving the concerted action of many degrees of freedom. Over the centuries, many different processes have been identified causing solid friction to occur, however, for most processes, it is generally difficult to argue why they would lead to the frequently observed (a) proportionality between solid friction and load and (b) irrelevance of the apparent contact area. Moreover, when several mechanisms act in parallel, as is usually the case, it is difficult to predict simple trends like whether more roughness increases or decreases friction: More roughness generally leads to more plastic and viscoelastic deformation and thus to higher friction but roughness also reduces true, microscopic contact and adhesive or capillary forces thereby lowering friction. Given the diversity of mechanisms, it is clear that there can be no universal reason for the empirical laws describing solid friction. Nonetheless, it turns out that the surface topography of the solids in contact and their change with load and sliding turns out crucial.

In my talk, I will present recent advances in contact mechanics, which describes contact-induced deformations and stresses, and explore how the newly gained insights benefit the explanation of the validity of empirical friction laws as well as reasons for their breakdown.

Contact mechanics and its relation to empirical friction laws
Thu 26.01.2023   Prof. Dr. Roel Dullens  Radboud University Nijmegen  16:30 s.t.
Prof. Dr. Roel Dullens: „Emergence of interparticle friction in attractive colloidal matter”
Radboud University Nijmegen - Seminar@HHUD: 26.01.2023 16:30 s.t., Lecture hall 25.31 O0.5J

Interparticle friction plays a governing role in the mechanics of particulate materials. However, virtually all experimental studies to date rely on measuring macroscopic responses, and as such it remains largely unknown how frictional effects emerge at the microscopic level. This is particularly challenging in systems subject to thermal fluctuations due to the transient nature of interparticle contacts. Here, we directly relate particle-level frictional arrest to local coordination in an attractive colloidal model system. We reveal that the orientational dynamics of particles slows down exponentially with increasing coordination number due to the emergence of frictional interactions, the strength of which can be tuned simply by varying the attraction strength. Using a simple computer simulation model, we uncover how the interparti-cle interactions govern the formation of frictional contacts between particles. Our results establish quantitative relations between friction, coordination and interparticle interactions. This is a key step towards using interparticle friction to tune the mechan-ical properties of particulate materials.

Emergence of interparticle friction in attractive colloidal matter
Thu 19.01.2023   Prof. Dr. Ulf Wiedwald  Universität Duisburg-Essen  16:30 s.t.
Prof. Dr. Ulf Wiedwald: „Magnetic Nanoparticles: From Physical Design to Medical Applications”
Universität Duisburg-Essen - Seminar@HHUD: 19.01.2023 16:30 s.t., Lecture hall 25.31 O0.5J

The application of magnetic nanoparticles (MNPs) in biomedicine and theranostics is one of the most dynamic and promising fields of nanoparticles research. In my presentation, several examples for the use of multifunctional hybrid MNPs in theranostics are discussed. We designed, synthesized and tested various MNPs like ferrites [1], core-shell architectures [2], and magnetite-gold (Fe3O4-Au) hybrids [3] for optimized performance, e.g. in magnetic resonance imaging (MRI), magnetic particle hyperthermia (MPH) or DNA splitting [4]. The multidisciplinary approach allows us to address the entire research chain from the chemical synthesis, over the physical properties to cancer treatment methodologies [5] and toxicity screening [6].


  1. E. Myrovali et al., Sci. Rep. 6, 37934 (2016).
  2. S. Liébana-Viñas et al., RSC Advances 6, 72918 (2016).
  3. M. V. Efremova et al., Sci. Rep. 8, 11295 (2018).
  4. A. Nikitin et al., ACS Applied Materials & Interfaces 13, 14458–14469 (2021).
  5. A. Garanina et al., Nanomedicine: Nanotechnol., Biol. and Med. 25, 102171 (2020).
  6. A. Garanina et al., Nanomaterials 12, 38 (2022).
Magnetic Nanoparticles: From Physical Design to Medical Applications
Thu 12.01.2023   Dr. Francesco Buccheri  Institut für Theoretische Physik IV, Heinrich-Heine-Universität Düsseldorf  16:30 s.t.
Dr. Francesco Buccheri: „Transport in Topological materials”
Institut für Theoretische Physik IV, Heinrich-Heine-Universität Düsseldorf - Seminar@HHUD: 12.1.23 16:30 s.t., Lecture hall 25.31 O0.5J

The notion of topology applied to the band theory of crystalline solids has become a paradigm to complement our understanding of phases of matter and opens the possibility of important technological advances in the fields of quantum computation and electronic control. In this talk, I will introduce two paradigmatic models, a quasi-one-dimensional supercon-ductor and a three-dimensional semimetal, and review some of their recent experimental realization. I will characterize the associated topologically non-trivial states and their robustness against electron-phonon interaction, a key step toward their detection. I will also investigate the signatures in thermoelectric transport, highlighting the contribution of the edge or surface states.

Transport in Topological materials
Thu 01.12.2022   Prof. Dr. Reinhard Werner  Leibniz Universität Hannover  16:30 s.t.
Prof. Dr. Reinhard Werner: „Geschichten über Quantenkorrelationen”
Leibniz Universität Hannover - Seminar@HHUD: 1.12.2022 16:30 s.t., Lecture hall 25.31 O0.5J

Verschränkung ist ein Schlüsselbegriff der Quantentheorie und allermodernen Quantentechnologien. In diesem Vortrag betrachte ich die Meilensteine der Entwicklung und was die jeweiligen Forscher umgetrieben hat. Von Einstein-Podolsky-Rosen über Bell und Tsirelson läuft eine Theorie-Entwicklung, für deren experimentelle Bestätigung es den dies-jährigen Physik-Nobelpreis für Clauser, Aspect und Zeilinger gab. Dies wird wieder eine Flut von wohlmeinenden Erklärungen auslösen, die Verschränkung zu einem mysteriösen Spuk vernebeln. Diesen Nebel ein wenig transparenter zu machen, ist das Hauptanliegen meines Vortrags.

Geschichten über Quantenkorrelationen
Thu 20.10.2022   Julia Sammet  Goethe-Universität Frankfurt am Main  16:30 s.t.
Julia Sammet: „Physik-Lernzentrum: Von Studierenden für Studierende”
Goethe-Universität Frankfurt am Main - Seminar@HHUD: 20.10.22 16:30 s.t., Lecture hall 25.31 O0.5J

Außercurriculare Unterstützungsstrukturen sind in den letzten Jahren immer populärer geworden. Bei der Einrichtung solcher Strukturen stellt sich die Frage der organisatorischen und finanziellen Ausgestaltung. Das Physik-Lernzentrum in Frankfurt wurde von fünf Fachschaften aus verschiedenen Fachbereichen für mehrere Preise nominiert und wurde neben dem universitätseigenen 1822-Preis für exzellente Lehre auch mit dem Ars Legendi Fakultäten Preis 2022 ausgezeichnet. Im Vortrag stellen wir das Konzept unseres Lernzentrums und der Physik Vorkurse vor und diskutieren die Notwendigkeit/Sinnhaftigkeit solcher außercurricularen Lernstrukturen.

Physik-Lernzentrum: Von Studierenden für Studierende
WE Physik, Heinrich-Heine-Universität Düsseldorf


Seminar about Bachelor, Master and other Theses from the Institut for Theoretical Physics II


Link: Physics Colloquium

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