Three elected APS Fellows: Grosse Perdekamp, Madhavan, DeMarco

Siv Schwink

Three Physics Illinois faculty members—Professors Matthias Grosse Perdekamp, Vidya Madhavan, and Brian DeMarco—have been elected Fellows of the American Physical Society. Election to Fellowship is a distinct honor that recognizes significant contributions to the field, including outstanding physics research, important applications of physics, leadership in or service to physics, or significant contributions to physics education.

Professor Matthias Grosse Perdekamp

Professor Matthias Grosse Perdekamp
Professor Matthias Grosse Perdekamp

Matthias Grosse Perdekamp works in experimental nuclear physics. He currently carries out experiments at the Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory on Long Island and at the Super Proton Synchrotron (SPS) at CERN in Geneva, Switzerland.

The PHENIX experiment at RHIC uses high energy collisions of polarized protons to study the spin-dependent quark-structure and gluon-structure of the proton. Grosse Perdekamp served as deputy spokesperson for PHENIX and led a team of American, Korean, Japanese and Chinese institutions in upgrading PHENIX trigger detectors and electronics for the study of proton spin-structure at the highest collision rates at RHIC. Using this instrumentation, he and his collaborators carried out measurements using rare W-bosons and high momentum neutral pions as probes for spin distributions of quarks, anti-quarks, and gluons inside the proton.

At the High Energy Accelerator Research Organization (KEK) in Tsukuba, Japan, Grosse Perdekamp used electron-positron annihilation into pairs of quarks and anti-quarks with subsequent fragmentation into jets of hadrons to study spin effects in the formation of hadrons from quarks. The measurements revealed correlations between the azimuthal distributions of hadrons in jets and the original quark spin. These correlations, first predicted by John Collins, have far-reaching implications: they serve as analyzers for transverse quark spin inside the proton in high energy proton-proton or electron-proton collision experiments at RHIC, the Deutsches Elektronen Synchrotron (DESY), CERN and the Jefferson Laboratory.

In a follow-up effort, Grosse Perdekamp and his Illinois colleagues Jen-Chieh Peng, Naomi Makins and Caroline Riedl, have joined the COMPASS collaboration at CERN, where the SPS provides a unique negative pion beam. Scattering this beam of transversely polarized proton targets makes it possible to explore correlations between transverse proton spin and transverse quark momentum. A measurement of these correlations will shed first light on the orbital motion of quarks in the proton.

Grosse Perdekamp received his diplom in physics from Freiburg University in 1990, and his doctoral degree in physics from the University of California, Los Angeles, in 1995. He was an associate research scientist at Yale University from 1995 to 1998, and a research scientist at Johannes Gutenberg University in Mainz, Germany, from 1998 to 1999. In 2002, he was a RIKEN Fellow at RHIC. He joined the faculty at Physics Illinois in 2002, remaining a Fellow at RIKEN through 2007. He received the Xerox Research Award in 2008 and was named a Willett Faculty Scholar in 2010. In 2013, when he was promoted to full professor, he was one of four scholars selected by the U. of I. Campus Committee on Promotion and Tenure for the Campus Distinguished Promotion Award.

Grosse Perdekamp was nominated for Fellowship by APS’s Division of Nuclear Physics. The citation reads: “For a leadership role in spin physics at RHIC and the measurement of the novel Collins fragmentation functions at Belle.”

Professor Vidya Madhaven

Professor Vidya Madhavan
Professor Vidya Madhavan
Condensed matter physicist Vidya Madhavan recently moved her research program from Boston College to Physics Illinois. She investigates fundamental problems in quantum materials where interactions between the spin, charge, and structural degrees of freedom lead to emergent phenomena. She uses the tools of scanning tunneling microscopy (STM), scanning tunneling spectroscopy (STS), spin-polarized STM (SP-STM) and molecular beam epitaxy (MBE) to unravel the mysteries of complex systems at the atomic scale. Her group carries out challenging, high-risk experiments, wherein the possibility of discovering new phenomena is high. Her team’s recent work has focused on STM studies of complex oxides and thin films of topological materials.

Madhavan received her bachelor’s degree in metallurgical engineering in 1991 from the Indian Institute of Technology, Chennai, and a master of technology degree in solid state materials in 1993 from the Indian Institute of Technology, New Delhi. She held a postdoctoral appointment at the University of California, Berkeley from 1999 to 2002, before joining the physics faculty at Boston College in 2002. She received an NSF CAREER Award in 2007. Madhavan joined the faculty at Illinois in 2014.

Madhavan was nominated for Fellowship by APS’s Division of Condensed Matter Physics. The citation reads: “For major contributions to the study of topological phases of electronic matter using advanced spectroscopic imaging STM.”

Professor Brian DeMarco

Professor Brian DeMarco
Professor Brian DeMarco
Brian DeMarco's research program in atomic-molecular-optical physics at the U. of I. focuses on solving outstanding problems in condensed matter physics using ultra-cold atoms trapped in an optical lattice. This approach—using one quantum system to emulate another—is known as quantum simulation and was first proposed as a potentially revolutionary technique by Richard Feynman.  DeMarco’s research centers on understanding models of strongly correlated materials, such as high-temperature superconductors. Current research problems being tackled by his team include the properties of the disordered Hubbard models and thermometry and cooling in strongly correlated lattice systems.

DeMarco's group was the first to identify the cross-over between quantum tunneling and thermal activation of phase slips in an optical lattice and the first to realize 3D Anderson localization of matter.  His group was also the first to trap atoms in a disordered optical lattice in a regime described by the disordered Bose-Hubbard and disordered Fermi-Hubbard model. Most recently, his group provided the first experimental evidence for many-body localization.

DeMarco received his bachelor’s degree in physics with a mathematics minor from the State University of New York at Geneseo in 1996, graduating summa cum laude. He earned his doctoral degree in physics from the University of Colorado Boulder in 2001, where he created the first atomic Fermi gas. He completed his postdoctoral work at the National Institute of Standards and Technology, Boulder, before joining the faculty at Physics Illinois in 2003. His work has been recognized by numerous honors. In 1999 as a graduate student, he earned the first JILA Scientific Achievement Award.  In 2002, the same work earned him the American Physical Society's Division of Atomic, Molecular, and Optical Physics Thesis Award. DeMarco is the recipient of an NSF CAREER award, ONR Young Investigator award, and a Sloan Foundation Fellowship. In 2012, he received the Engineering at Illinois Dean’s Award for Excellence in Research, and in 2013 was selected as a Willett Faculty Scholar. He has served on the DAMOP Executive Committee and the review panel for NRC postdoctoral fellowships, and currently serves on the National Academy of Science's Committee on Atomic, Molecular, and Optical Physics (CAMOS), NASA’s Fundamental Physics Science Standing Review Board, and is a current member of the national Defense Science Study Group.

DeMarco was nominated for Fellowship by APS’s Division of Atomic, Molecular & Optical Physics. The citation reads: “For the pioneering use of ultracold gases in optical lattices as quantum simulators to study disordered condensed matter systems.”

APS is a non-profit membership organization working to advance and diffuse the knowledge of physics through its research journals, scientific meetings, education, outreach, advocacy, and international activities. The society has over 51,000 members, including physicists in academia, national laboratories, and industry in the United States and throughout the world.


Recent News

  • Research

An international team of researchers led by Paul Scherrer Institute postdoctoral researcher Niels Schröter now provide an important benchmark for how "strong" topological phenonena can be in a real material. Writing in Science, the team reports experiments in which they observed that, in the topological semimetal palladium gallium (PdGa), one of the most common classifiers of topological phenomena, the Chern number, can reach the maximum value that is allowed in any metallic crystal. That this is possible in a real material has never been shown before. Moreover, the team has established ways to control the sign of the Chern number, which might bring new opportunities for exploring, and exploiting, topological phenomena. Illinois Physics Professor Barry Bradlyn contributed to the theoretical work elucidating the team's experiments.

At the European Organization for Nuclear Research (CERN), over 200 physicists across dozens of institutions are collaborating on a project called COMPASS. This experiment (short for Common Muon and Proton Apparatus for Structure and Spectroscopy) uses CERN’s Super Proton Synchrotron to tear apart protons with a particle beam, allowing researchers to see the subatomic quarks and gluons that make up these building blocks of the universe. But particle beams aren’t the only futuretech in play – the experiments are also enabled by a heavy dose of supercomputing power.

New findings from physicists at the University of Illinois, in collaboration with researchers at The University of Tokyo and others, clarify the physics of coupling topological materials with simple, conventional superconductors.

Through a novel method they devised to fabricate bulk insulating topological insulator (TI) films on superconductor (SC) substrates, the researchers were able to more precisely test the proximity effect, or coupling when two materials contact one another, between TIs and SCs. They found that when the TI film is bulk insulating, no superconductivity is observed at the top surface, but if it is a metal, as in prior work, strong, long-range superconducting order is seen. The experimental efforts were led by physics Professor Tai-Chang Chiang and Joseph Andrew Hlevyack, postdoctoral researcher in Professor Chiang’s group, in collaboration with Professor James N. Eckstein’s group including Yang Bai, Professor Kozo Okazaki’s Lab at The U. of Tokyo, and five other institutes internationally. The findings are published in Physical Review Letters, which has been highlighted as a PRL Editors’ Suggestion.

  • Accolades

Illinois Physics Assistant Professor Barry Bradlyn has been selected for a 2020 National Science Foundation CAREER (Faculty Early Career Development) Award. This award is conferred annually in support of junior faculty who excel in the role of teacher-scholars by integrating outstanding research programs with excellent educational programs. Receipt of this award also reflects great promise for a lifetime of leadership within the recipients’ respective fields.

Bradlyn is a theoretical condensed matter physicist whose work studying the novel quantum properties inherent in topological insulators and topological semimetals has already shed new light on these extraordinary systems. Among his contributions, he developed a real-space formulation of topological band theory, allowing for the prediction of many new topological insulators and semimetals.