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Distinguished Lecture Series

Status of Digital Applications of High-Tc Superconductors

Dr. Horst  Rogalla

by: Dr. Horst Rogalla

Affiliation: Superconductive Electronics Group, NIST Boulder and ECEE Department, University of Colorado at Boulder

Date: Thursday May 18, 2017

Time: 12:00 pm – 1:00 pm

Location: Houston Science Center – Building 593 — Room 102

Overview

Status of Digital Applications of High-Tc Superconductors

Biography

Horst Rogalla was born in Germany in 1947. He studied Physics and Mathematics in Munster, Germany, and finished his study with a Ph.D in Physics. In 1986 he finished his habilitation in Physics in Giessen, Germany. After 2 years in the group of Mike Tinkham in Harvard, he accepted in 1987 a professorship in Low Temperature Physics at the University of Twente in the Netherlands from which he retired 2012. In 2010 he joined the Superconducting Electronics group of Sam Benz at NIST Boulder, USA, and joined the ECEE Department of the University of Colorado at Boulder as a Research Professor. Since 2015, he is “IEEE Distinguished Lecturer for Superconductive Electronics”. In his time at the University of Twente, he was Director of the Material Science Institute CMO for a number of years and a founding member of the MESA+ institute. In the European Community he was a member of the board of the Network of Excellence in Superconductivity SCENET. He was also initiator and founding member of the European Society of Applied Superconductivity (ESAS) and the European Foundry Network FLUXONICS. He is member of the board of the ESAS and the IEEE Council on Superconductivity, and on international advisory boards of conferences such as EUCAS, ISEC, ISS and ASC. Since April 2016, he is Editor in Chief of the Superconductivity News Forum.

In his scientific carrier, he worked on the materials properties of superconductors, their deposition as thin films and application in Superconductive Electronics. Before the finding of High Temperature Superconductivity (HTS), he worked on the application of Nb3Ge thin films in SQUIDs and nanobridge sensors. After the finding of the High-Tc superconductors he invented the HTS ramp-Type Josephson junction and developed with his colleagues in Twente a multi-layer integration technique, which allowed to realize superconducting circuits with up to 4 HTS layers. This technique was successfully applied to the realization of HTS Superconductive Electronic devices such as digitizers and s-d-converters. Later on he was involved in the development of s-d-wave Josephson junctions based on Nb/YBCO ramp-type junctions, which allowed to realize p- junctions and apply them to new types of circuits. At NIST, he is working on noise thermometry using normal and superconducting electronics. For the Air Force he ran a project on arrays of YBCO split-ring resonators for meta-material applications. Recently, he started another Air Force project on digital applications of HTS Josephson junctions. In 2011 he received the IEEE Max Swerdlow Award and in 2013 he became life-time honorary voting member of the board of the European Society of Applied Superconductivity ESAS.

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