• Femtosecond Optoinjection of Intact Tobacco BY-2 Cells Using a Reconfigurable Photoporation Platform 

  Mitchell, Claire A.; Kalies, Stefan; Cizmar, Tomas; Heisterkamp, Alexander; Torrance, Lesley; Roberts, Alison G.; Gunn-Moore, Frank J.; Dholakia, Kishan (San Francisco, CA : Public Library of Science, 2013)

  A tightly-focused ultrashort pulsed laser beam incident upon a cell membrane has previously been shown to transiently increase cell membrane permeability while maintaining the viability of the cell, a technique known as ...
• Laser-assisted bioprinting at different wavelengths and pulse durations with a metal dynamic release layer: A parametric study 

  Koch, L.; Brandt, O; Deiwick, A.; Chichkov, B. (Singapur : Whioce Publishing Pte Ltd, 2017)

  For more than a decade, living cells and biomaterials (typically hydrogels) are printed via laser-assisted bioprinting. Often, a thin metal layer is applied as laser-absorbing material called dynamic release layer (DRL). ...
• Human stem cell based corneal tissue mimicking structures using laser-assisted 3D bioprinting and functional bioinks 

  Sorkio, A.; Koch, L.; Koivusalo, L.; Deiwick, A.; Miettinen, S.; Chichkov, B.; Skottman, H. (London : Elsevier Ltd., 2018)

  There is a high demand for developing methods to produce more native-like 3D corneal structures. In the present study, we produced 3D cornea-mimicking tissues using human stem cells and laser-assisted bioprinting (LaBP). ...
• Equivariant indices of vector fields and 1-forms on varieties 

  Mamedova, Firuza (Hannover : Institutionelles Repositorium der Leibniz Universität Hannover, 2018)

  Given a $G$-invariant holomorphic 1-form with an isolated singular point on a germ of a complex analytic $G$-variety with an isolated singular point, its equivariant homological index and (reduced) equivariant radial index ...
• On the combinatorics of Tits arrangements 

  Geis, David (Hannover : Institutionelles Repositorium der Leibniz Universität Hannover, 2018)

  In this thesis, we study simplicial arrangements of hyperplanes. Classically, a simplicial arrangement $\mathcal{A}$ in $\mathbb{R}^r$ is a finite set of linear hyperplanes such that every component of $\mathbb{R}^r \setminus ...
• Time evolution and steady states of dissipative quantum many-body systems 

  Overbeck, Vincent Raphael (Hannover : Institutionelles Repositorium der Leibniz Universität Hannover, 2018)

  We investigate a dissipative Ising model that exhibits the Ising symmetry via a variational approach. In the non-equilibrium steady state phase diagram, we find a first order and a second order transition meeting at a ...
• Numerical study of the nonequilibrium dynamics of 1-D electron-phonon systems using a local basis optimization 

  Brockt, Christoph (Hannover : Institutionelles Repositorium der Leibniz Universität Hannover, 2018)

  In this dissertation a newly developed numerical method is presented, which is optimized for the time evolution of one-dimensional lattice systems with large local Hilbert spaces. This method extends the time-evolving ...
• A spatio-spectral polarization analysis of 1 µm-pumped bulk supercontinuum in a cubic crystal (YAG) 

  Choudhuri, Aradhana; Chatterjee, Gourab; Zheng, Jiaan; Hartl, Ingmar; Ruehl, Axel; Miller, R.J. Dwayne (Heidelberg : Springer Verlag, 2018)

  We present the first systematic study of the spatio-spectral polarization properties of a supercontinuum generated in a cubic crystal, yttrium–aluminum garnet (YAG), including a full spectral analysis of the white light ...
• Resonant laser-SNMS for spatially resolved and element selective ultra-trace analysis of radionuclides 

  Franzmann, Michael; Bosco, Hauke; Hamann, Linda; Walther, Clemens; Wendt, Klaus (Cambridge : Royal Society of Chemistry, 2018)

  The newly developed resonant laser-SNMS system at the IRS Hannover combines the high spatial and decent mass resolution of a TOF-SIMS instrument with the element-selective process of resonant laser ionization. This setup ...
• Reducing tilt-to-length coupling for the LISA test mass interferometer 

  Tröbs, M.; Schuster, S.; Lieser, M.; Zwetz, M.; Chwalla, M.; Danzmann, K.; Barránco, G.F.; Fitzsimons, E.D.; Gerberding, O.; Heinzel, G.; Killow, C.J.; Perreur-Lloyd, M.; Robertson, D.I.; Schwarze, T.S.; Wanner, G.; Ward, H. (Bristol : Institute of Physics Publishing, 2018)

  Objects sensed by laser interferometers are usually not stable in position or orientation. This angular instability can lead to a coupling of angular tilt to apparent longitudinal displacement - tilt-to-length coupling ...
• Gold nanoparticle-mediated laser stimulation induces a complex stress response in neuronal cells 

  Johannsmeier, Sonja; Heeger, Patrick; Terakawa, Mitsuhiro; Kalies, Stefan; Heisterkamp, Alexander; Ripken, Tammo; Heinemann, Dag (London : Nature Publishing Group, 2018)

  Stimulation of neuronal cells generally resorts to electric signals. Recent advances in laser-based stimulation methods could present an alternative with superior spatiotemporal resolution. The avoidance of electronic ...
• Conformal Killing horizons and their thermodynamics 

  Nielsen, Alex B.; Shoom, Andrey A. (Bristol : Institute of Physics Publishing, 2018)

  Certain dynamical black hole solutions can be mapped to static spacetimes by conformal metric transformations. This mapping provides a physical link between the conformal Killing horizon of the dynamical black hole and the ...
• Calogero, spherically reduced and PT-deformed 

  Correa, Francisco; Lechtenfeld, Olaf (Trieste : Scuola Internazionale Superiore di Studi Avanzati (S I S S A), 2016)

  The rational Calogero model based on the An- 1 root system is spherically reduced to a superintegrable angular model of a particle moving on Sn- 2 subject to a very particular potential singular at the Weyl chamber walls. ...
• A Zeeman slower for diatomic molecules 

  Petzold, M.; Kaebert, P.; Gersema, P.; Siercke, M.; Ospelkaus, S. (Bristol : Institute of Physics Publishing, 2018)

  We present a novel slowing scheme for beams of laser-coolable diatomic molecules reminiscent of Zeeman slowing of atomic beams. The scheme results in efficient compression of the one-dimensional velocity distribution to ...
• Adaption of an array spectroradiometer for total ozone column retrieval using direct solar irradiance measurements in the UV spectral range 

  Zuber, Ralf; Sperfeld, Peter; Riechelmann, Stefan; Nevas, Saulius; Sildoja, Meelis; Seckmeyer, Gunther (Göttingen : Copernicus GmbH, 2018)

  A compact array spectroradiometer that enables precise and robust measurements of solar UV spectral direct irradiance is presented. We show that this instrument can retrieve total ozone column (TOC) accurately. The internal ...
• Ways to stop mirrors from moving unnecessarily : design of advanced gravitational wave detectors 

  Adya, Vaishali Badrish (Hannover : Institutionelles Repositorium der Leibniz Universität Hannover, 2018)

  Now that we have entered an era of gravitational wave astronomy, gravitational wave detectors are expected to detect several events a month (or more) in the near future. The current ground based detectors are undergoing ...
• Quantum degenerate mixtures of 23Na-39K and coherent transfer paths in NaK molecules 

  Schulze, Torben Alexander (Hannover : Institutionelles Repositorium der Leibniz Universität Hannover, 2018)

  The discovery and development of methods to cool, trap and manipulate atomic ensembles have generated a revolution in atomic physics, culminating in the ever expanding research field of ultra-cold matter through the ...
• Asymptotics for subcritical fully nonlinear equations with isolated singularities 

  Zhang, Wei (Hannover : Institutionelles Repositorium der Leibniz Universität Hannover, 2018)

  In dieser Dissertation betrachten wir die Gleichung $$\sigma_k(A^u) = u^{\left(p-\frac{n+2}{n-2}\right)k}, wobei $n\ge 3$ und $ p \in \left(\frac n{n-2} , \frac{n+2}{n-2}\right). Dabei ist $\sigma_k$ das $k$-te ...
• Improved post-processing in searches for continuous gravitational waves and a model for transient continuous gravitational wave emission from neutron star glitches 

  Singh, Avneet (Hannover : Institutionelles Repositorium der Leibniz Universität Hannover, 2018)

  (english) Gravitational waves (GW) are tiny oscillations in the fabric of space-time, first hypothesised within the framework of Einstein’s General theory of Relativity (GR) a little more than 100 years ago. The first ...
• Translation invariant quantum walks with discrete symmetries 

  Stahl, Christoph (Hannover : Institutionelles Repositorium der Leibniz Universität Hannover, 2018)

  Quantum walks are discrete-time evolutions of single particles on lattices that transfer the concept of classical random walks to quantum theory. Topological insulators are objects that promise symmetry-protected edge-states ...

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