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Katsaros Group

Nanoelectronics

It is impossible to picture modern life without thinking of the vast amount of microelectronic applications that surround us. However, such development has only become possible with the invention of the transistor in the 1950’s. This – back at that time – few centimeters large device, led to a technological revolution. Today the size of the transistors has been shrunk to 7nm where quantum physics comes into play. Researchers are now developing new concepts and techniques using quantum mechanics to allow information processing to operate on completely different principles and to create a quantum computer.


In this line, Loss and DiVincenzo suggested in 1998 the use of electron spins confined in lithographically defined quantum dots as elementary qubits to realize a quantum computer. In the past few years, holes in Germanium have emerged as a very promising platform for the realization of these spin qubits, due to their small effective mass and large spin orbit coupling and absence of the valley problem faced by non-confined electron spins. In addition, in the quantum information community there has been recently a huge wave of excitement about the prospect of using protected qubits for quantum computation. Such protection can be realized on the hardware-level by using topological qubits or cleverly designed electrical circuits.


In the nanoelectronics group, we study spin qubits in two-dimensional Germanium heterostructures and in parallel, we aim to understand whether protected qubits can be realized in hybrid semiconductor-superconductor systems. 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.




Team

Image of Carla Borja Espinosa

Carla Borja Espinosa

PhD Student

Image of Maksim Borovkov

Maksim Borovkov

PhD Student

Image of Anton Bubis

Anton Bubis

Postdoc


Image of Giorgio Fabris

Giorgio Fabris

PhD Student

Image of Paul Falthansl-Scheinecker

Paul Falthansl-Scheinecker

PhD Student

Image of Kristen Galvin

Kristen Galvin

PhD Student


Image of Marian Janik

Marian Janik

PhD Student

+43 2243 9000 721204

Image of Simon Robson

Simon Robson

Postdoc

Image of Kevin Roux

Kevin Roux

Postdoc


Image of Jaime Saez Mollejo

Jaime Saez Mollejo

PhD Student

+43 2243 9000 721204

Image of Oliver Sagi

Oliver Sagi

PhD Student

Image of Yona Schell

Yona Schell

PhD Student


Image of Dina Sokolova

Dina Sokolova

Predoctoral Visiting Scientist


Current Projects

Hybrid semiconductor-superconductor quantum devices | Hole spin orbit qubits in Ge quantum wells | High impedance circuit quantum electrodynamics with hole spins


Publications

Seoane Souto R, Leijnse M, Schrade C, Valentini M, Katsaros G, Danon J. 2024. Tuning the Josephson diode response with an ac current. Physical Review Research. 6(2), L022002. View

Shimura Y, Godfrin C, Hikavyy A, Li R, Aguilera Servin JL, Katsaros G, Favia P, Han H, Wan D, de Greve K, Loo R. 2024. Compressively strained epitaxial Ge layers for quantum computing applications. Materials Science in Semiconductor Processing. 174(5), 108231. View

Valentini M, Sagi O, Baghumyan L, de Gijsel T, Jung J, Calcaterra S, Ballabio A, Aguilera Servin JL, Aggarwal K, Janik M, Adletzberger T, Seoane Souto R, Leijnse M, Danon J, Schrade C, Bakkers E, Chrastina D, Isella G, Katsaros G. 2024. Parity-conserving Cooper-pair transport and ideal superconducting diode in planar germanium. Nature Communications. 15, 169. View

Valentini M. 2023. Mesoscopic phenomena in hybrid semiconductor-superconductor nanodevices : From full-shell nanowires to two-dimensional hole gas in germanium. Institute of Science and Technology Austria. View

Helson V, Zwettler T, Mivehvar F, Colella E, Roux KER, Konishi H, Ritsch H, Brantut JP. 2023. Density-wave ordering in a unitary Fermi gas with photon-mediated interactions. Nature. 618, 716–720. View

View All Publications

ReX-Link: Georgios Katsaros


Career

Since 2022 Professor, Institute of Science and Technology Austria (ISTA)
2016 – 2022 Assistant Professor, Institute of Science and Technology Austria (ISTA)
2012 – 2016 Group Leader, Johannes Kepler University, Linz, Austria
2011 – 2012 Group Leader, Leibniz Institute for Solid State and Materials Research, Dresden, Germany
2006 – 2010 Postdoc, 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 (ÖAW)
2013 ERC Starting Grant
2013 FWF START Award
2012 FWF Lise Meitner Fellowship
2011 Marie Curie Carrier Integration Grant


Additional Information

Download CV
Open Katsaros group site
Physics & Beyond at ISTA



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