Quantum Nanostructures and
Nanofabrication Group

Prof. Karl K. Berggren and Dr. P. Donald Keathley

The frontier of information processing lies in nanoscience and nanotechnology research. At the nanoscale, materials and structures can be engineered to exhibit interesting new properties, some based on quantum mechanical effects. Our research focuses on developing nanofabrication technology at the few-nanometer length-scale. We use these technologies to push the envelope of what is possible with photonic and electrical devices, focusing in particular on superconductive and free-electron devices. Our research combines electrical engineering, physics, and materials science and helps extend the limits of nanoscale engineering.


Emily Toomey selected as 2019 AAAS Mass Media Fellow
Congratulations to Emily Toomey for being selected as 2019 AAAS Mass Media Fellow. The AAAS Mass Media Fellowship is a competitive program aimed at encouraging communication in science and fostering... Read more >>
New Publication “Measuring thickness in thin NbN films for superconducting devices”
The authors present the use of a commercially available fixed-angle multiwavelength ellipsometer for quickly measuring the thickness of NbN thin films for the fabrication and performance improvement of superconducting nanowire... Read more >>
John Simonaitis awarded NSF fellowship
Congratulations to John Simonaitis on receiving the National Science Foundation Graduate Research Fellowship. This prestigious and competitive award will support his work for three years.
New Publication “Enhancement of Optical Response in Nanowires by Negative-Tone PMMA Lithography”
The method of negative-tone polymethyl methacrylate (PMMA) electron-beam lithography is investigated to improve the performance of nanowire-based superconducting detectors. Using this approach, the superconducting nanowire single-photon detectors (SNSPDs) have been... Read more >>
New Publication “Bridging the Gap Between Nanowires and Josephson Junctions: A Superconducting Device Based on Controlled Fluxon Transfer”
The basis for superconducting electronics can broadly be divided between two technologies: the Josephson junction and the superconducting nanowire. While the Josephson junction (JJ) remains the dominant technology due to... Read more >>

The nanocryotron: A superconducting-nanowire three-terminal electrothermal device