Fakultät 2 Mathematik und Naturwissenschaften
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1484 Submissions in this community.

Recent Submissions
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...

Relativistic laser plasma dynamics with ultrathin foils

Bränzel, Julia (2017)

This thesis investigated the fundamental interaction processes of laser pulses of relativistic intensity interacting with dense plasmas, created from ultrathin foils. These processes include, ion a...

Development and analysis of all diode laser ns-MOPA systems for high peak power applications

Vu, Thi Nghiem (2017)

The aim of this work is to design and characterize all-diode laser based master oscillator power amplifier (MOPA) systems, which operate in the ns-pulse region with peak powers in the range of more...

Optimal control of patterns in some reaction-diffusion-systems

Ryll, Christopher (2017)

This thesis investigates the optimal control of reaction-diffusion-systems that exhibit various interesting patterns such as traveling wave fronts or spiral waves. In particular, we consider a mode...

Partitioning of membrane components in adhering vesicles

Steinkühler, Jan (2017)

Biological membranes are segmented into functional compartments of different length and time scales. Here we study model systems which mimic certain aspects of these multiscale phaenomena. We intro...

Excitation and acceleration of atoms in tailored strong laser fields

Eilzer, Sebastian (2017)

This research investigates the new found effect of frustrated tunnelling ionisation (FTI) in complex electromagnetic field configurations. After the surprising finding of neutral atoms which survi...

Untersuchung der THz-Strahlcharakteristik an der Synchrotronstrahlquelle MLS

Pohl, Andreas (2017)

Synchrotrons haben sich in den letzten Jahren als bedeutende Strahlungsquelle für den THz-Bereich entwickelt. Strahlung mit größeren Wellenlängen als der longitudinalen Ausdehnung der Elektronenpak...

Unravelling ultraslow lithium-ion diffusion in γ-LiAlO2

Wiedemann, Dennis; Nakhal, Suliman; Rahn, Johanna; Witt, Elena; Islam, Mazharul M.; Zander, Stefan; Heitjans, Paul; Schmidt, Harald; Bredow, Thomas; Wilkening, Martin; Lerch, Martin (2016)

Lithium aluminum oxide (γ-LiAlO2) has been discussed and used for various applications, e.g., as electrode coating, membrane, or tritium breeder material. Although lithium-ion diffusion in this sol...

Mode-locking, dynamic and nonlinear optical properties of MOVPE-grown InAs/InP quantum-dot and quantum-dash lasers

Sadeev, Tagir (2016)

Die eingereichte Arbeit untersucht die Eigenschaften von auf InP basierenden optischen Quantenpunkt- (quantum dot, QDot) und Quantenfaden (QDash)- Halbleiterlasern. Der erste Teil der Arbeit widmet...

Charakterisierung und Optimierung von (Al, Ga)N-basierten UV-Photodetektoren

Brendel, Moritz (2016)

In this work, the influence of dislocation density, heterostructure design and detector geometry on the electro-optic properties of AlGaN-based metal-semiconductor-metal photodetectors (MSM PD) was...

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...

Extended defects in PVT-grown AlN

Langhans, Frank (2016)

The possibility of industrial fabrication of devices based on aluminium nitride bulk crystals is on the one hand limited by the small diameter of state of the art bulk crystals and on the other han...

Quantum chemical studies of transition-metal complexes and aqueous solvent effects

Theilacker, Kolja (2016)

Thanks to the rapid development in the area of computer hardware, and appreciable advances in algorithms and theoretical chemistry methods, quantum chemical calculations have become a crucial tool ...

Adaptation of E. coli towards tryptophan analog usage

Oehm, Stefan (2016)

The presented study set out to change the amino acid set of the genetic code in two different Trp-auxotrophic E. coli strains with the help of the serial transfer regime under constant evolutionary...

Nonlinear nonequilibrium dynamics in a nematic liquid crystal

Stieger, Tillmann (2016)

Liquid crystals are elongated molecules with a rich and surprising phase behavior. Nonequilibrium conditions open a myriad possibilities of manipulating matter, and reach collective states not acce...

Development of local hybrid functionals for time-dependent density functional theory

Maier, Toni Mike (2016)

The present work is concerned with the advancement of the relatively recent class of local hybrid functionals. The first part of the work addresses the conjunction of local hybrid functionals with ...

Depolymerisation von Polysiloxanen und die eisenvermittelte Aktivierung kleiner Moleküle

Döhlert, Peter (2016)

Die vorliegende Arbeit umfasst im ersten Teil Studien zum Recycling von Polysiloxanen. Dazu wurde ein Protokoll zur Depolymerisation entwickelt, bei dem ein Depolymerisationsreagenz und ein Lewis S...

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...

Synthesis and structural characterization of semiconductors based on kesterites

Ritscher, Anna (2016)

The here-presented thesis provides detailed investigations on the structural characteristics of the chalcogenide Cu2ZnSnS4 (CZTS). This semiconductor material is a promising candidate for absorber ...