Nanoelectronics

There is an intense effort in information technology to find solutions to the problems emerging from the miniaturization of conventional complementary metal oxide semiconductor devices. In microelectronics, researchers are trying to create ever smaller and faster transistors by decreasing their dimensions or by choosing materials with different, more promising properties.

Researchers in basic research on the other hand are investigating new concepts which would allow information processing to operate on completely different principles. In this line, Loss and DiVincenzo suggested the use of electron spins confined in lithographically defined quantum dots as elementary quantum bits to realize a quantum computer. In parallel to the development of spin qubits, there has recently been a huge wave of excitement in the prospect of using topological qubits for quantum computation. Such topological qubits are predicted to be robust versus decoherence. In the main focus of these proposals are the so-called Majorana fermions. Various studies have suggested the use of topological insulators and semiconductor nanowires for the realization of Majorana fermions. Indeed, first experimental signatures of Majorana fermions have been reported in the past few years.

In the nanoelectronics group we study spin qubits in Ge based systems, self-assembled QDs and lithographically defined QDs in two dimensional hole gases. In parallel we aim to understand whether Majorana fermions can be realized and detected in a hole-type system. Finally, hybrid Al/InAs nanowire devices are studied aiming at proving the topological properties of Majorana fermions. While our research is focused on the realization of different types of qubits, the group is very much interested in studying new fundamental physics emerging in semiconductor nanodevices.

Contact

Georgios Katsaros
Institute of Science and Technology Austria (IST Austria)
Am Campus 1
A – 3400 Klosterneuburg

E-mail: georgios.katsaros@remove-this.ist.ac.at

CV and Publication List

Katsaros Group website

Assistant
Stephanie Danzinger

Phone: +43 (0)2243 9000-1124
E-mail:  stephanie.danzinger@remove-this.ist.ac.at

Team

  • Maksim Borovkov, Intern
  • Matthias Brauns, Postdoc
  • Luka Drmic, Programmer
  • Andrea Hofmann, Postdoc
  • Daniel Jirovec, PhD Student
  • Jason Jung, Process Engineer
  • Josip Kukucka, PhD Student
  • Joshua Milem, PhD student
  • Lada Vukusic, Postdoc
  • Hannes Watzinger, Postdoc

Selected Publications

  • Vukušić, L., Kukučka, J., Watzinger, H., Milem, J. M., Schäffler F. and Katsaros, G.(2018): Single-shot readout of hole spins in Ge, arXiv: 1803.01775
  • Watzinger, H., Kukučka, J., Vukušić, L., Gao, F., Wang, T., Schäffler, F., Zhang, J. J. and Katsaros, G.  (2018): A Ge hole spin qubit, Nature Communications 9, 3902.
  • Zhang, J. J., Katsaros G., Montalenti, F., Scopece, D., Rezaev, R. O., Mickel, C., Rellinghaus, B., Miglio, L., De Franceschi, S., Rastelli, A. and Schmidt, O.G. Monolithic growth of ultra-thin Ge nanowires on Si(001) Phys. Rev. Lett. 109, 085502 (2012).
  • Katsaros, G., Golovach, V.N., Spathis, P., Ares, N., Fournel, F., Schmidt, O.G., Glazman, L.I. and De Franceschi S. Observation of spin selective tunnelling in SiGe nanocrystals Phys. Rev. Lett. 107, 246601 (2011).
  • Katsaros, G., Spathis, P., Stoffel, M., Fournel, F., Mongillo, M., Bouchiat, V., Lefloch, F., Rastelli, A., Schmidt O.G., and De Franceschi, S. Hybrid superconductor-semiconductor devices made from self-assembled SiGe nanocrystals on silicon Nature Nanotechnology 5, 458-464 (2010).

Career

As of 2016 Assistant Professor, IST Austria
Since 2012 Group Leader, Johannes Kepler University, Linz, Austria
2011–2012 Group Leader, Leibniz Institute for Solid State and Materials Research, Dresden, Germany
2006-2010 Postdoc at CEA, Grenoble, France
2006 PhD, Max Planck Institute for Solid State Research, Stuttgart, Germany
2001-2002 Research Assistant, National Center for Scientific Research “Demokritos”, Athens, Greece

Selected Distinctions

2015 Elected member of the “Young Academy of the Austrian Academy of Sciences”
2013 ERC Starting Grant
2013 FWF START Award
2012 FWF Lise Meitner Fellowship
2011 Marie Curie Carrier Integration Grant

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