Research

researchMy primary research interests cover the many challenges involved in generating device structures and evaluating the current transport behaviour in the nanometer regime. Additionally, I am interested in devising and analysing novel device operation concepts. In the following, I discuss my current and most important research topics.

Structure Generation

Electronic devices are consistently moving towards smaller feature scales, which gives rise not only to today’s non-planar devices, such as FinFETs and nanowire array FETs, but also to novel future device concepts based on, e.g., entangletronics. However, in order to be able to accurately model such devices operating at the nanoscale, precise knowledge of the device geometry is required due to a critical dependence of the current transport behavior on the device structure. Present fabrication technologies, however, introduce geometrical variations into the generated device structures due to the many challenges involved, which, however, must be correctly predicted. 

From the diverse set of challenges in structure generation, I particularly focus on plasma etching of high aspect ratio structures, ion implantation, annealing, and oxidation processes.

Quantum Device Simulation

Once fabricated, the current transport behavior must be evaluated to determine the device’s electrical characteristics. Due to the nanometer-sized geometries, quantum mechanical effects emerge which must additionally be considered.  

An attractive new approach to model future nanoelectronic devices is based on solving the Wigner-Boltzmann equation. Both stochastic and deterministic methods have been applied to solve the one-dimensional Wigner equation. However, only the Wigner Monte Carlo method, using the signed-particle technique, has made two-dimensional Wigner simulations viable thus far.

This approach is key to developing novel device concepts for the emerging field of entangletronics, which is short for entangled electronics. Entangletronics is a novel discipline based on coherence, interference, and entanglement, ultimately allowing to specifically engineer the current transport of devices in the nanometer regime. Within this context, I investigate novel device operation concepts based on simulation based analyses. The simulations are based on the ViennaWD simulation package of which I additionally oversee the overall development.

High Performance Computational Methods

However, accurately describing the device fabrication and the quantum current transport introduces the need for increasingly complex modeling and simulation approaches. This translates into massively increased simulation times, which – if left untreated – would severely limit the high pace of research in microelectronics.vsc_3_scaled

Therefore, an all-encompassing aspect to all areas I investigate is the need to utilise high performance  computing resources. Therefore, I am interested in utilizing such resources, i.e., supercomputers (like the VSC-3 in Vienna) as well as multi-core workstations and many-core accelerators and co-processors. To that end I investigate and develop algorithms, data structures, and simulators using shared-memory parallelization techniques (e.g. OpenMP) as well as distributedmemory (e.g. MPI), and accelerator approaches (e.g. CUDA).

Recent Posts

Back with the 2016 Google Summer of Code at TU Wien

GSoC2016Logo

After being ordered to the bench in 2015 (to give others a chance to participate as well), we made it back! The TU Wien – for the fifth time now – participates this year again in Google’s Summer of Code program with the loose interest group “Computational Science and Engineering at TU Wien”. Our group is composed of several departments of our university and thus offers students a diverse set of free open source projects to work on. By now, we can look back on a decent history: We have already participated in 2011, 2012, 2013, 2014 and so far supervised 40 international students with a great interdisciplinary team of university staff.

For this year, visit our org(anization) at the program website and checkout our project ideas. Selected students will have the excellent opportunity to enter an internationally highly visible student summer program, extend their programming skills, get in touch with open source development teams in the area of science and engineering, and on top of that Google will hand out USD 5 500 to each successful student. Interested students should get in touch with us via our mailing list as soon as possible to prepare their application material; submission deadline is March 25.

For us, the university, participating in the Google Summer of Code allows us to advance our open source code, which in turn is desperately needed to advance our science with a reasonable pace. We get access to highly motivated students who are eager to learn and bring new ideas and impulses to the table, which for obvious reasons is of great interest to us. It also allows us to spread the awareness about the importance of open source code for science and engineering and educate future research software engineers. This is what I call a win-win.

The Austrian media picked up on the topic as well – here are some links in German:

  1. VSC Seminar Talk: Modern Multi-Core Architectures for Supercomputing Comments Off on VSC Seminar Talk: Modern Multi-Core Architectures for Supercomputing
  2. Opening of my Christian Doppler Laboratory Comments Off on Opening of my Christian Doppler Laboratory
  3. NVIDIA GPU Research Center Comments Off on NVIDIA GPU Research Center
  4. HPC 2016 Comments Off on HPC 2016
  5. VSC School Kick-Off Leave a reply
  6. IUE Summer of Code 2015 Leave a reply
  7. Open source research software – my (reused) “two” cents Leave a reply
  8. LSSC 2015 Leave a reply
  9. HPC 2015 Leave a reply