Sebastian Steiger

Learn More
—The development of a new nanoelectronics modeling tool, NEMO5, is reported. The tool computes strain, phonon spectra , electronic band structure, charge density, charge current, and other properties of nanoelectronic devices. The modular layout enables a mix and match of physical models with different length scales and varying numerical complexity. NEMO5(More)
The transient orientation of lambda DNA and lambda-DNA oligomers has been measured during pulsed field gel electrophoresis. The DNA becomes substantially aligned parallel to the electric field E. In response to a single rectangular pulse, orientation shows an overshoot with a peak at 1 second, then a small undershoot, and finally a plateau. When the field(More)
An enhanced valence force field model for zinc-blende crystals is developed to provide a unified description of the isothermal static and dynamical lattice properties of gallium arsenide. The expression for the lattice energy includes a second-nearest-neighbor coplanar interaction term, the Coulomb interaction between partially charged ions, and(More)
—Nonequilibrium Green's Functions (NEGF) are employed to model carrier transport and luminescence in a single-quantum-well light-emitting diode (LED). The sound theoretical formalism allows for a consistent description of coherence loss as well as fundamental scattering mechanisms and reveals details about physical phenomena such as the quantum-confined(More)
Novel device concepts and better channel materials than Si are required to improve the performance of conventional metal-oxide-semiconductor field-effect transistors (MOSFETs). The exploration of III-V semiconductors is mainly driven by the extremely high electron mobility of the materials. Recently, several researches have demonstrated that III-V high(More)
—In the last few years, evolutionary computing (EC) approaches have been successfully used for many real world optimization applications in scientific and engineering areas. One of these areas is computational nanoscience. Semi-empirical models with physics-based symmetries and properties can be developed by using EC to reproduce theoretically the(More)
  • Diss Eth, No, +11 authors Vii Zusammenfassung
  • 1979
2010 Acknowledgment I wish to thank Prof. Wolfgang Fichtner for the opportunity to work in a well-equipped and comfortable environment at the Integrated Systems Laboratory during several years. For many helpful discussions and advices as well as for carefully reading my scientific contributions, including this thesis, a special thank goes to Prof. Andreas(More)
A multiscale approach was adopted for the calculation of confined states in self-assembled semiconductor quantum dots (QDs). While results close to experimental data have been obtained with a combination of atomistic strain and tight-binding (TB) electronic structure description for the confined quantum states in the QD, the TB calculation requires(More)
We analyze the ellipticity of the standard kldrp Wurtzite model for the symmetrized and the Burt-Foreman operator ordering. We find that the symmetrized Hamiltonian is unstable, leads to different results and can cause spurious solutions. We show that the operator ordering in Wurtzite must be completely asymmetric to be stable. The asymmetric operator(More)