Fermions

Interview with Dale Van Harlingen, Professor of Physics at the University of Illinois, Urbana-Champaign. He recounts his childhood in Ohio and his undergraduate education at OSU in physics and his early work on SQUIDS. Van Harlingen discusses his mentor Jim Garland, and he explains his decision to stay at OSU for graduate school to develop SQUID devices to make phase-sensitive measurements. He explains the opportunities that gained him a postdoctoral appointment at the Cavendish Laboratory in Cambridge where he developed his expertise in the Josephson Effect, and where he met John Clarke, who offered him a subsequent postdoctoral position at UC Berkeley. Van Harlingen describes his foray using SQUIDS to push the quantum limit, and he explains his decision to join the faculty at Illinois, where he was impressed both with the quality of the research and how nice everyone was. He describes joining the Materials Research Laboratory and the development of the Micro and Nanotechnology Laboratory, and he conveys his admiration for Tony Leggett. Van Harlingen discusses his research in NMR microscopy, grain boundary junctions, scanning tunneling microscopy, vortex configurations, and he describes his current interest in unconventional superconductors. At the end of the interview, Van Harlingen conveys his excitement about the national quantum initiative as a major collaboration between universities and National Labs, and he explains his motivation to understand if Majorana fermions actually exist.

Interview with Michael Creutz, Senior Physicist Emeritus at Brookhaven National Laboratory. Creutz surveys where lattice gauge theory is “stuck” and where there are promises for breakthroughs in the field. He recounts his birthplace in Los Alamos, where his father was a physicist, and his upbringing in Pittsburgh and then San Diego. Creutz describes his undergraduate education at Caltech and his graduate research at Stanford, where Sid Drell supervised his work on deep inelastic scattering. He explains his decision to take a postdoctoral position at the University of Maryland, and he discusses becoming involved in lattice gauge theory following his exposure to Ken Wilson’s work on renormalization. Creutz describes Brookhaven’s focus on proton scattering when he joined the Lab, and he explains his work during the discovery of the J/psi. He explains his motivation for writing a textbook on lattices, and the value of ever-more powerful computers for lattice gauge research. Creutz explains his “controversial” approach to staggered fermions, and his work on topology in lattice theory. At the end of the interview, Creutz discusses his current interests in chiral symmetry, he reflects on the burst of intellectual activity at the dawn of lattice gauge theory, and he explains why parity violation in neutrinos continues to confound theorists.

Interview with Bertram Batlogg, Professor Emeritus at ETH Zurich. Batlogg surveys his current interests in topological superconductivity and superconductivity in twisted layer graphene, and he connects this current research with his own work at Bell Labs earlier in his career. He considers the current state of play in high-Tc research and he recounts his family's Austrian heritage and his upbringing early interests in physics. Batlogg describes his undergraduate experience at ETH Zurich and his reasons for remaining to complete his PhD thesis work. He describes Bell Labs as the Mecca for his research as a postdoctoral fellow and then as a staff scientist. Batlogg discusses his work on Hall effect measurements, superconductivity, and heavy Fermions, and he describes his tenure as head of the solid state physics and materials research division.  He describes the culture of basic science and how it changed from the 1980s to the 1990s, and he discusses his formative collaborations with Bob Cava and 1-2-3 YBCO. He narrates the story of meeting Jan Hendrik Schön and the issues that would lead to the investigation led by Mac Beasley. Batlogg conveys the scientific and emotional turmoil of this episode and the impact this episode had on his sense of trust in people. He describes participating in the investigation after he had already left Bell Labs to return to ETH Zurich to build up a research group with a focus that included topics such as charge dynamics and heavy Fermions in very high magnetic fields. At the end of the interview, Batlogg emphasizes advances in data acquisition and spectroscopy that propelled the field forward over his career, and he considers how some his research can contribute in the future to discoveries in both the applied and basic realms of science.

In this interview, David Zierler, Oral Historian for AIP, interviews Kenneth Nordtvedt, Professor Emeritus of Physics at Montana State University. Nordtvedt recounts his childhood in suburban Chicago and he describes how he discovered his early talents in math and science. He discusses his undergraduate experience at MIT and he explains the formative impact that Sputnik had on his scientific interests. Nordtvedt discusses his graduate work at Stanford, where he studied with Marshall Sparks, and he explains his decision to leave the program early to return to MIT where he worked in the Instrumentation Lab. Nordtvedt describes his dissertation work at Stanford on the coupling of fermions to bosons, and his interest in pursuing research that would be mutually beneficial to elementary particle physics and solid state physics. He describes his postgraduate work on bubble chambers at Los Alamos, and he explains the origins of his interest in general relativity and the influence of Leonard Schiff. Nordtvedt describes his teaching and research career at Montana State, and his long-standing collaborations with NASA. He discusses some of his politically-oriented motivations to retire early, and at the end of the interview, Nordtvedt describes some of the contract physics work he has done in recent years.