Institut für Theoretische Physik
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126 Submissions in this community.

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The role of van der Waals interactions on the electronic properties of molecules and materials

Ferri, Nicola (2017)

Long-range van der Waals (vdW) interactions play a fundamental role in the structure and stability of many systems, ranging from small dimers to complex hybrid inorganic/organic systems (HIOS). How...

Self-assembly and self-organization of magnetic Janus-like colloids in three dimensions

Yener, Arzu Bahar (2017)

In this thesis, we investigate the recent model of laterally shifted dipoles, i.e. spherical particles carrying a magnetic dipole moment in a non-central position, with a view to selfassembly as we...

Active emulsion droplets driven by Marangoni flow

Schmitt, Maximilian (2017)

Diese Forschungarbeit beinhaltet Theorie und Simulation aktiver Emulsionstropfen, die aufgrund einer inhomogenen Oberflächenspannung auf ihrer Grenzfläche schwimmen. Der zugrundeliegende Effekt hei...

Dense colloidal suspensions in microchannel flow

Kanehl, Philipp (2017)

Kolloidale Suspensionen im Scherrfluss migrieren in Richtung kleiner Scherrate. Suspensionen mit zwei verschiedenen Teilchengrößen entmischen sich im Zentrum eines Mikrokanals. Kolloide in Kanälen ...

On superradiant phase transitions in generalised Dicke models

Hayn, Mathias (2017)

In this doctoral thesis, the thermodynamic phases und phase transitions of a generalised Dicke model are studied and characterised. Both, finite and vanishing temperatures are considered. The Dic...

Attosecond ionisation dynamics in long range potentials

Kaushal, Jivesh (2016)

Strong Field Ionisation has been an active research field for well over five decades, since the pioneering work of L. V. Keldysh. It has offered an unprecedented insight into, and control over, ele...

Einfluss dynamischer Resonanzen auf die Wechselwirkung optischer Femtosekunden-Pulse mit transparenten Dielektrika

Hofmann, Michael (2016)

It is expected that during the linear interaction of a medium with an optical pulse the induced dielectric polarization follows the electric field instantaneously, if the fundamental wavelength is ...

Phase transitions in networks of quantum critical systems

Sorokin, Aleksandr (2016)

In der vorliegenden Arbeit erforschen wir Netzwerke von Vielteilchen-Quantensystemen, um neue, durch die Wechselwirkung der individuellen Knoten entstehende Quanten- und topologische Phasen zu besc...

Dynamics and stochastic properties of passively mode-locked semiconductor lasers subject to optical feedback

Jaurigue, Lina (2016)

Passively mode-locked semiconductor lasers produce short optical pulses at very high repetition rates. In this thesis we investigate the influence of time-delayed optical feedback on the dynamics a...

Binary mixtures of rod-like colloids

Lugo-Frías, Rodrigo (2016)

In this work we investigate the shear induced instabilities occurring in colloidal binary mixtures of rigid anisotropic particles. To this end, we derive a theoretical framework including equilibri...

Efficient modelling of linear electronic polarization in materials using atomic response functions

Gobre, Vivekanand V. (2016)

The study of matter interacting with external fields is important to understand and design materials with desired (opto)electronic properties. Reliable methods for the accurate and efficient calcul...

Adsorption of atoms and molecules on surfaces

Ruiz Lopez, Victor Gonzalo (2016)

Understanding the properties of novel hybrid interfaces has implications in both fundamental science and technology. The interfaces of hybrid inorganic/organic systems (HIOS), for instance, may lea...

Liquid-crystal ordering of photo-switchable molecules on a surface

Tavarone, Raffaele (2016)

Photo-switchable molecules are chemical compounds that undergo configurational changes upon photon absorption. In particular, azobenzene-based photo switches possess two isomeric stable states: an ...

Chemotaxis of self-phoretic active particles and bacteria

Pohl, Oliver (2016)

Chemotaxis in systems of active particles is a most interesting topic to study. Typically, these phenomena are encountered in cellular systems. However, recently, motion along chemical gradients i...

Pattern formation of dipolar colloids in rotating fields: layering and synchronization

Jäger, Sebastian; Klapp, Sabine H. L. (2011)

We report Brownian dynamics (BD) simulation and theoretical results for a system of spherical colloidal particles with permanent dipole moments in a rotating magnetic field. Performing simulations ...

Hydrodynamic interactions enhance the performance of Brownian ratchets

Grimm, Andrej; Stark, Holger (2011)

We investigate how hydrodynamic interactions between Brownian particles influence the performance of a fluctuating ratchet. For this purpose, we perform Brownian dynamics simulations of particles t...

Phase diagram of two-dimensional systems of dipole-like colloids

Schmidle, Heiko; Hall, Carol K.; Velev, Orlin D.; Klapp, Sabine H. L. (2012)

Based on Discontinuous Molecular Dynamics (DMD) simulations we present a phase diagram of two-dimensional nano-particles with dipole-like short-ranged interactions. Similar to systems with true, lo...

Effect of particle size and Debye length on order parameters of colloidal silica suspensions under confinement

Zeng, Yan; Grandner, Stefan; Oliveira, Cristiano L. P.; Thünemann, Andreas F.; Paris, Oskar; Pedersen, Jan S.; Klapp, Sabine H. L.; von Klitzing, Regine (2011)

Using atomic force microscopy (AFM) and small angle X-ray scattering (SAXS), we show a full comparison between structuring of nanoparticles in confinement and in bulk in order to explain the effect...

Percolation and orientational ordering in systems of magnetic nanorods

Alvarez, Carlos E.; Klapp, Sabine H. L. (2012)

Based on Monte Carlo (MC) computer simulations we study the structure formation of a system of magnetic nanorods. Our model particles consist of fused spheres with permanent magnetic dipole moments...

Two-dimensional colloidal networks induced by a uni-axial external field

Schmidle, Heiko; Jäger, Sebastian; Hall, Carol K.; Velev, Orlin D.; Klapp, Sabine H. L. (2013)

Based on Monte Carlo and Molecular Dynamics computer simulations we investigate the aggregation patterns and dynamics of model colloidal mixtures consisting of particles with either one or two, opp...