Department of Physics
Research, teaching and outreach in Physics at UW–Madison

News Archives

Lu Lu receives 2023 IUPAP Early Career Scientist Prize

Posted on

This story was originally posted by WIPAC

IceCube collaborator and UW–Madison assistant professor of physics Lu Lu received a 2023 International Union of Pure and Applied Physics (IUPAP) Early Career Scientist Prize “for her contributions to the development of high energy neutrino astronomy in the PeV energy region.” Lu accepted the award on July 27 during the opening ceremony at the 38th International Cosmic Ray Conference (ICRC) held in Nagoya, Japan.

profile photo of Lu Lu
Lu Lu

Early Career Scientist Prizes are given to early career scientists within each IUPAP commission who have up to eight years of postdoctoral research experience and have made significant contributions to the cosmic ray field. Lu is a recipient of the Early Career Scientist Prize in the Commission on Astroparticle Physics (C4).

Her PhD work focused on developing a novel technique to search for ultra-high-energy photons using data from the Pierre Auger Observatory. She also played a leading role in the initial design of the “Dual optical sensors in an Ellipsoid Glass for Gen2” (D-Egg), a two-PMT optical module for the IceCube Upgrade.

More recently, she made key contributions to the multimessenger correlation studies of the neutrino source candidate TXS0506+056 and to the detection of a particle shower associated with the hadronic decay of a resonant W boson.

Lu is currently an assistant professor of physics at the Wisconsin IceCube Particle Astrophysics Center (WIPAC) at the University of Wisconsin–Madison. Her current research focuses on diffuse high-energy astrophysical/cosmogenic neutrinos from TeV to EeV, Galactic PeVatron detection in the context of multimessenger observations, and the exploration of potential transient ultra-high-energy sources.

She is actively involved in IceCube outreach initiatives and has pioneered the development of an app that provides IceCube real-time alerts via augmented reality on mobile devices. Currently, she serves as co-lead of the diffuse science working group in IceCube and is one of three representatives of the physical science group of US-SCAR (Scientific Committee of Antarctic Research).

“I would like to express my deep appreciation for my collaborators and for those who work on foundational tasks such as reconstructions and calibrations, as their efforts behind the scenes make groundbreaking discoveries possible,” said Lu. “As early career scientists, we bear the responsibility of continuing and expanding experiments in the particle astrophysics field. We must collaborate and work together to ensure that the next generation of young scientists will have exciting discoveries to make.”

Physics researchers named part of $18M NSF materials research center

Posted on

The Department of Physics is part of a six-year, $18 million grant awarded to the University of Wisconsin–Madison’s Materials Research Science and Engineering Center (MRSEC) by the National Science Foundation. The award creates a National User Facility for X-FAST (XUV Femtosecond Absorption Spectroscopy Tabletop), a powerful XUV laser developed in the department.

Profile picture of Uwe Bergmann
Uwe Bergmann

MRSEC brings together 30 affiliated faculty from across nine departments to answer fundamental questions in materials science. The two interdisciplinary research groups (IRGs) funded by the award include one on stability in supercooled glasses and a second on magnetics in strained membranes. Physics professor Uwe Bergmann is a co-lead on IRG-2 along with materials science and engineering professor and physics affiliate faculty member Jason Kawasaki.

“The idea of our IRG is to make thin membranes of materials and then by straining them in various ways, changing their properties,” Bergmann says. “And our specific role is that we are in charge of x-ray and ultrafast characterization.”

The membranes being studied are 20-50 nanometer thin, crystalline materials. Kawasaki developed a way to produce very strong strains, up to 10%, which disrupt the perfect crystal lattice when applied. Once the atoms are pulled out of equilibrium by the strain, the energy levels change a little, the bonding changes, and exotic new phases are introduced. Bergmann is part of the IRG-2 team whose role is to perform ultrafast characterization of these changes. His team then informs the simulations group, whose theoretical calculations inform Kawasaki’s sample synthesis group.

“This is the typical circle between making the sample, finding out its properties, and understanding the properties — and then feeding it back to make new samples,” Bergmann says. “We’re trying to characterize these properties so that we can tailor them, so we can control them with light.”

a series of metallic boxes and cylinders with tubing and other apparatuses attached to them
The X-FAST XUV laser developed in the Bergmann group | courtesy of the Bergmann group

Being able to control the materials’ properties with fast, electromagnetic light pulses could be a boon to faster, more efficient computing and telecommunications, an important potential application of this work.

Bergmann’s role in MRSEC stems from his expertise in ultrafast x-ray spectroscopy. Since joining the department of physics in 2020, his group has developed and built the XUV transient absorption high harmonic generation instrument that will be used to characterize the changes in properties as a result of intense strain on the materials following ultrafast excitations. As part of the new funding, the X-FAST instrument is now a National User Facility, which provides access to researchers across the country. In addition, the new award is funding an upgrade that includes the terahertz (microwave to infrared) range for sample excitation, a range that team member and physics affiliate professor Jun Xiao has developed.

In addition to the two research thrusts, MRSEC also runs a robust outreach and education program as part of the funding.

MRSEC is one of 21 NSF-funded centers that conduct fundamental materials research, education and outreach at the nation’s leading research institutions. Paul Voyles, professor of materials science and engineering professor at UW–Madison, is MRSEC’s director.

Keith Bechtol, Victor Brar promoted to Associate Professors

Posted on

Congratulations to Keith Bechtol and Victor Brar, who were both promoted to associate professors of physics with tenure!

profile photo of keith bechtol
Keith Bechtol

Bechtol is an observational cosmologist with research interests in dark matter and dark energy, using the whole Universe as a lab to understand the fundamental physics of nature. He is part of the Dark Energy Survey (DES) that has cataloged more 500 million galaxies and thousands of supernovae to understand the nature of dark energy. He and his group are also working on the construction and commissioning of the Vera C. Rubin Observatory in preparation for the Legacy Survey of Space and Time (LSST). LSST is expected to catalog more stars, more galaxies and more solar system objects during its first year of operations than all previous telescopes combined.

“Professor Bechtol plays a leading role in the Vera C. Rubin Observatory, which is now poised to enable a major leap in the data available for understanding the development of our universe,” says Mark Eriksson, Chair and John Bardeen Professor of Physics.

Bechtol was a co-convener of the DES’s Science Release Working Group for four years and a co-convener of the Milky Way Working Group for two years. He is now serving as Technical Coordinator for the LSST Dark Energy Science Collaboration. In 2022, he was selected to the Department of Energy’s Early Career Research Program. He also proposed and is the faculty lead for the physics department’s Thaxton Fellowship, whose goal is to provide more equitable access to physics research experiences for undergraduates.

Victor Brar

Brar, the Van Vleck professor of physics and a member of the Wisconsin Quantum Institute, is an experimental condensed matter physicist with a research focus on quantum materials and novel imaging techniques. His group works on developing metamaterials such as 2D materials for use in laser sailing or fabricating graphene structures for use in telecommunications. They also use scanning tunneling microscopy and scanning tunneling potentiometry to understand the physical and electrical properties of materials.

“The experiments performed by Professor Brar and his research team have enabled measurements of completely new regimes for electron transport in 2D materials,” Eriksson says.

Brar was awarded a Moore Inventor Fellowship in 2018, a Sloan Fellowship in 2021, and a National Science Foundation CAREER award in 2023. He has additionally received two UW–Madison Research Forward awards.

Longtime physics staff member Ed Slotten has passed away

Posted on

Ed Slotten, a longtime physics department staff member who retired in 2005, passed away June 1. He was 75.

Ed joined the department shortly after graduating from Madison Area Technical College and worked here for 34 years before retiring. He was both an accountant and a research program manager.

“Ed was a friend, colleague, and superbly supported the department through the good and bad times,” says emeritus professor Don Reeder. “I was here for almost all his 34 years and witnessed his outstanding service.”

Says professor Bob Joynt: “Ed took care of me for anything financial from when I arrived in 1986 until his retirement almost 20 years later. I never had to worry about anything — he always had it covered. He was the person I also went to talk to whenever I just felt like talking — sometimes sports, sometimes university stuff — didn’t matter.  He was always a source of good cheer, wisdom, and fun. RIP, Ed.”

Professor Thad Walker adds: “I was interviewing in early 1990. I knew how important efficient purchasing was going to be to getting my experiments going quickly. I kept hounding Jim Lawler for details. Jim got tired of it, took me to Ed’s office, and asked Ed to have my reimbursement check ready later that morning. Ed’s delivery of said check shut me up. Ed was an excellent, efficient, and cheerful administrator.”

Ed was also a husband and father (he is survived by his wife, Debra, his daughter, Lisa, and his son, Scott), a passionate Badger and Madison-area high school sports fan, and a U.S. Army veteran.

Ed stopped by the department somewhat regularly even after his retirement, and his visits were always welcome. He will be greatly missed.

Link to Ed’s family obituary

IceCube shows Milky Way galaxy is a neutrino desert

Posted on
a red-lit IceCube lab (a metal modern-looking lab building stationed at the south pole) with the white swirl of the Milky Way behind it is in a photo, with an artists rendering of a stream of neutrinos (greek letter nu) streams out of the center of the Milky Way

The Milky Way galaxy is an awe-inspiring feature of the night sky, dominating all wavelengths of light and viewable with the naked eye as a hazy band of stars stretching from horizon to horizon. Now,

In a June 30 article in the journal Science, the IceCube Collaboration — an international group of more than 350 scientists — presents this new evidence of high-energy neutrino emission from the Milky Way. The findings indicate that the Milky Way produces far fewer neutrinos than the average distant galaxies.

“What’s intriguing is that, unlike the case for light of any wavelength, in neutrinos, the universe outshines the nearby sources in our own galaxy,” says Francis Halzen, a professor of physics at the University of Wisconsin–Madison and principal investigator at IceCube.

The IceCube search focused on the southern sky, where the bulk of neutrino emission from the galactic plane is expected near the center of the galaxy. However, until now, a background of neutrinos and other particles produced by cosmic-ray interactions with the Earth’s atmosphere made it difficult to parse out neutrinos originating from galactic sources — a significant challenge compounded by relatively sparse neutrino production in general.

Read the full story

Undergraduates named 2023 Hilldale Fellows

Posted on

Physics major Dhanvi Hiriyanna Bharadwaj has been named a 2023 Hilldale Fellow, working with Ramathasan Thevamaran in Mechanical Engineering. Astronomy-physics major Vicki Braianova, who is working with physics professor Peter Timbie, has also received the award.

The Hilldale Undergraduate/Faculty Research Fellowship provides research training and support to undergraduates at UW–Madison. Students have the opportunity to undertake their own research project in collaboration with UW–Madison faculty or research/instructional academic staff. Approximately 97 – 100 Hilldale awards are available each year.

Partnerships bring together UW–Madison quantum computing research, industry leaders

Posted on

Two leading companies in semiconductor quantum computing are partnering with researchers at the University of Wisconsin­–Madison, itself a long-time academic leader in quantum computing.

UW–Madison’s separate partnerships with Intel and HRL Laboratories are part of a first round of collaborations announced June 14 by the LPS Qubit Collaboratory (LQC), a national Quantum Information Science Research Center hosted at the Laboratory for Physical Sciences (LPS). Established in support of the National Quantum Initiative Act, LQC is facilitating partnerships between industry and academic and national labs to advance research in quantum information science.

“These collaborations are great examples of UW–Madison partnering with industry on the development of important technologies, in this case semiconductor quantum computers,” says physics professor Mark Eriksson, the UW–Madison lead on the partnerships.

Read the full story

Alex Levchenko honored with H.I. Romnes Fellowship

Posted on

This post is modified from one originally published by the Office of the Vice Chancellor for Research and Graduate Education

 

profile photo of Alex Levchenko
Alex Levchenko

Physics professor Alex Levchenko was one of thirty-five of the University of Wisconsin–Madison faculty to be awarded fellowships from the Office of the Vice Chancellor for Research and Graduate Education for 2023-24. The awardees span the four divisions on campus: arts and humanities, physical sciences, social sciences and biological sciences.

“These awards recognize our faculty research, academic and outreach successes and provide an opportunity for continued development of their outstanding research programs,” says Steve Ackerman, vice chancellor for research and graduate education. “I’m grateful that we are able to recognize invest in these faculty in this way, and I look forward to seeing the results of their imaginative use of these funds.”

The awards are possible due to the research efforts of UW–Madison faculty and staff. Technology that arises from these efforts is licensed by the Wisconsin Alumni Research Foundation and the income from successful licenses is returned to the OVCRGE, where it’s used to fund research activities and awards throughout the divisions on campus.

Eighteen faculty, including Levchenko, have been honored with the H.I. Romnes Fellowships to recognize faculty with exceptional research contributions within their first six years from promotion to a tenured position. The award is named in recognition of the late WARF trustees president H.I. Romnes and comes with $60,000 that may be spent over five years.

Levchenko studies fundamental aspects of condensed matter physics with a focus on electronic phases of matter and quantum transport. Specific areas of expertise include superconductivity, topological order, and nanoscale systems such as graphene and other van der Waals materials. He is a Fellow of the American Physical Society and of the Alexander von Humboldt Foundation, and recipient of an early career grants from the National Science Foundation and the Binational Science Foundation. His teaching covers all levels of undergraduate and graduate education, and he serves on multiple professional review panels internationally.

Federal grants to 2 Wisconsin startups highlight UW’s leading role in fusion energy

Posted on
a series of metal cylinders connected together in a research lab

A pair of startups with University of Wisconsin–Madison roots — one spun out of Department of Physics technology — have received large federal grants to support their efforts to develop clean energy through fusion.

Realta Fusion and Type One Energy Group, both based in the Madison area, were two of eight ventures from across the nation that the U.S. Department of Energy selected for grants worth millions of dollars to support research and development of fusion energy technologies. Earth-based fusion energy, which seeks to mimic the nuclear fusion that powers the stars, could someday provide a source of clean, safe and virtually limitless power and heat.

UW–Madison has a reputation as one of the leading places in the world for plasma physics and fusion research, and local companies are emerging from that knowledge base. Match that to the deep expertise in manufacturing in the state and we have the key ingredients to make Wisconsin the global hub for fusion. — Physics professor and Realta Fusion Chief Scientific Officer Cary Forest

One-quarter of the companies chosen for this federal investment are based in Wisconsin, reflecting UW–Madison’s leading role in fusion research to generate renewable and reliable energy as the United States strives to reduce its reliance on fossil fuels.

“UW–Madison is creating valuable partnerships in this potentially transformative option for meeting the energy needs of future generations,” says Amy Wendt, associate vice chancellor for research in the physical sciences. “With growth in innovative public-private partnerships for fusion research, we are looking forward to building on UW’s strong history and growing global leadership in the science and technology that will enable the realization of fusion power.”

Both Realta Fusion and Type One Energy Group are pursuing fusion energy based on technologies pioneered by researchers at UW–Madison.

Realta is working to develop fusion energy and heat for industrial applications via a compact but powerful magnetic mirror as an early step toward larger-scale fusion applications. The company was spun out of a federally funded research project housed in the Department of Physics and led by physics professor Cary Forest.

“Wisconsin is extremely well positioned to lead in the commercialization of fusion,” says Forest, who co-founded Realta and serves as its chief science officer.

Read the full story