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Polymer-Defined Semiconductor Nanostructures
Semiconductor nanostructures with sizes down to a few nanometers can be defined in different, highly parallel processes with the aid of polymers. In... -
Interaction of Palladium Nano-Crystals with Hydrogen During PECVD Growth of Carbon Nanotubes
Using plasma-enhanced chemical vapor deposition (PECVD) with Acetylene and Ammoniac on Pd-specimens Carbon nanotubes (CNT) could be produced... -
Quantum Cascade Lasers for the Mid-infrared Spectral Range: Devices and Applications
Quantum cascade lasers emitting at λ∼5 µm based on different active region designs are investigated. Using lattice-matched GaInAs/AlInAs on InP... -
Room Temperature Spin Polarization of Epitaxial Half-Metallic Fe3O4(111) and CrO2(100) Films
The electronic structure of thin epitaxial films of magnetite (Fe3O4) and chromium dioxide (CrO2) has been investigated at 293 K by means of spin-... -
Self-Organized Structures on Flat Crystals: Nanowire Networks Formed by Metal Evaporation
Nanotechnology often requires fabricating large, well-ordered assemblies of nanoscopic components on the surface of a substrate. It has been... -
Pulsed Laser Deposition (PLD) -- A Versatile Thin Film Technique
Pulsed laser deposition (PLD) is for many reasons a versatile technique. Since with this method the energy source is located outside the chamber, the... -
Order Out of Noise: Maximizing Coherence of Noisy Oscillators
In many nonlinear systems noise can play a constructive role, leading to an appearance of an ordered state. In this paper we describe the effects of... -
Decoherence Due to Discrete Noise in Josephson Qubits
We study decoherence produced by a discrete environment on a charge Josephson qubit by introducing a model of an environment of bistable fluctuators.... -
Terahertz Quantum Cascade Lasers
Unipolar semiconductor injection lasers emitting at THz frequencies (4.3 THz, λ∼69 μm and 3.5 THz, λ∼85 μm) are discussed. The devices are based on... -
Magnetic Liquid Patterns in Space and Time
Macroscopic surface patterns of magnetic fluids are experimentally investigated for four different configurations of the liquid layer, and the... -
Electrochemistry and Electrogenerated Chemiluminescence of Semiconductor Nanocrystals in Solutions and in Films
A retrospective overview of electrochemical studies of semiconductor nanocrystals (NCs) is given. The electrochemical behavior of monodisperse NCs... -
Functionalization of Carbon Nanotubes
Through functionalization of carbon nanotubes, i.e., the attachment of appropriate chemical functionalities onto their conjugated sp2 carbon... -
Prospects of Quantum Cascade Lasers with GaInAs Waveguides
High-performance InP-based quantum cascade lasers for pulsed operation in the 5.5 µm wavelength range have been fabricated in the strain-compensated... -
Optics and Transport in Conjugated Polymer Crystals: Interchain Interaction Effects
We investigate the fundamental properties of conjugated-polymer semiconductors from the novel viewpoint of solid-state {ab initio} approaches, that... -
Ultrafast Buildup of a Many-Body Resonance after Femtosecond Excitation of an Electron-Hole Plasma in GaAs
On a femtosecond timescale, we observe how Coulomb screening and collective scattering build up in an extreme nonequilibrium electron-hole plasma... -
The Single Quantum Dot Photodiode -- A Two-Level System with Electric Contacts
Semiconductor quantum dots can be described as quantum mechanical two-level systems. Under the influence of strong electromagnetic driving fields and... -
A Sharp Eye on Thin Films -- Advances through Synchrotron Radiation
The availability of high-brilliance synchrotron radiation has opened new avenues in thin-film research. In recent years new experimental techniques... -
Another Semiconductor Revolution: This Time It's Lighting!
A 40 year old semiconductor technology, Light Emitting Diodes (LEDs) has steadily improved performance and cost to a point where it will move from... -
Field-Induced Superconductivity in Films with Magnetic Dots
Magnetic-field-induced superconductivity (FIS) is a rare phenomenon that has been observed up to now in only very few materials. We show that this... -
New Challenges in Optical Coating Design
Modern mathematical algorithms allow to theoretically generate thin film designs that fit nearly any reasonable specification. Nevertheless, as...