Don’t Be Afraid of the Fog

As a young boy growing up in Iran, Masoud Loghmani (B.S. ’96, physics) loved to spend summer nights under the stars, imagining the possibilities.

“I remember back then there was a lot of buzz about humans landing on the moon and the Apollo flights were all over the news,” Loghmani said. “Every night in the summer we would go out and we would watch the moon and the stars and I would ask my parents, ‘Are the astronauts up there? Are they up there traveling?’ I was maybe four, five years old and it was just amazing for me.”

All these years later, some things haven’t changed.Masoud Loghmani  at Mt. FujiMasoud Loghmani at Mt. Fuji

“Curiosity about how the whole world works has been with me since childhood,” Loghmani explained. “When people ask me to describe myself, I tell them I’m eternally curious.”

Over the last 20-plus years—thanks to boundless curiosity and a unique talent for problem- solving—Loghmani has built a worldwide reputation as a visionary and innovator, developing next-generation tech products through his startups and as a product development leader at Google, YouTube and now TikTok, where he leads brand advertising solutions as director of product management.

And physics lies at the heart of everything he does.

“A lot of people ask me what physics has to do with what I do,” Loghmani explained. “Physics is broadly about learning how to solve problems with a degree of precision necessary for the problem at hand. And when you are solving a technology problem or solving a product problem for your customers, these are things you need to know.”

The complexities of physics captured Loghmani’s interest early on.

“In middle school, I didn’t want to do physics for a while, I wanted to be a surgeon,” Loghmani said. “But then when I was about 11 years old, I read a book I got from my uncle, and I still remember the book was ‘One Two Three . . . Infinity,’” Loghmani said. “It was about all different aspects of physics and the math behind physics and that just got me hooked. That’s when I decided to study physics.”

Loghmani focused on physics and math in high school and then left Iran for the U.S., thanks to a professor he knew at the State University of New York who helped him get a student visa to study physics and electrical engineering there. A self-taught programmer, Loghmani soon found himself balancing his college classes with a programming job at Digital Technics, a tech startup that built switches for telecommunications. 

“When you’re making phone calls, there’s a switch behind the scenes that’s making the connections, giving you all the services, and they were making that switch,” Loghmani said. “I had already been playing a lot with telecommunications switches, trying to figure out how they work, and that helped me secure the job in the company.”

When Digital Technics moved to the D.C. area, Loghmani moved, too. Still working full time, he transferred to the University of Maryland and zeroed in on physics.

“Coming to College Park, I had access to a whole different caliber of classmates and professors,” he recalled. “I was spending a lot of hallway hours with professors after classes and at one point one of them encouraged me to take an independent study course with him. He actually designed a course just for us to spend time on fractals and chaos in nonlinear systems and I really enjoyed that.”

Soon after Loghmani graduated with his B.S. in physics, he launched his first startup, LogicTree, from a Gateway 2000 computer in his bedroom. The company’s first product was a speech recognition system that could access information and share it over the phone. One of the first customers was Metro, the D.C. area’s transportation system. 

“We had built an automated system for them that would talk to callers and give them the information they needed,” Loghmani explained. “Before that, Washington Metro used actual people—an agent would look up your question and say, ‘Oh, you want to go from the National Mall to College Park, here’s which Metro to take, here’s the bus to take,’ and the agent would give you the itinerary over the phone. So we built a system that would give callers all that information automatically.”

In the years that followed, LogicTree sold speech-enabled systems for transit and traffic solutions to transportation agencies all over the country and eventually expanded its speech recognition products into the directory assistance/Yellow Pages technology business, serving customers like AT&T and Verizon. Loghmani had found his calling.

“I realized I enjoyed finding problems, solving them and building companies around them,” he said.

But he also learned there are no guarantees in the world of startups.

“Around 2007, I started a company, ti.ki, with a new idea to automate event planning, which is a very complex problem. That completely flopped,” Loghmani said. 

By 2010, realizing he wanted to learn more about product development and marketing, Loghmani enrolled in the Kellogg School of Management at Northwestern University and earned an MBA in marketing and finance two years later. He then relocated to California’s Silicon Valley where he joined the tech-consulting company Accenture and cofounded a group aimed at identifying promising startups and creating partnerships to support innovation. 

Meanwhile, he was preparing to launch a new product of his own.

“It was basically speech recognition built into a coin-sized wearable device that you could talk to and ask for information and then it would give you information back on a screen nearby,” Loghmani explained. “You could ask questions and it would connect to Google and do the search. The idea was like ‘Star Trek,’ you could tap and talk.”

As Loghmani started fundraising to launch the product, he found out about the work that tech giants were doing in the same space (Google, Amazon, Apple). So, after some exploration he ended up joining Google. Over the next six years, Loghmani developed a variety of next-generation products including a context-driven system that dramatically changed the way YouTube, part of Google, targeted online ads, initiating more choices for advertisers and less privacy intrusion for users. 

“I reinvented how we understand context on YouTube and let advertisers choose where their ad shows, providing advertising revenue that’s not privacy intrusive, it’s contextual,” Loghmani explained. “You see ads based on the content you are watching there, not because of your browsing behavior, and what you have done somewhere else on the web. We started that product literally from zero with one engineer and grew it to hundreds of millions of dollars of revenue in a very short time.”

Starting from zero to create something big is what Loghmani does best.

“I love challenges,” Loghmani said, “and I love to build things from zero to one. You start from scratch and make it happen.”

Even as Loghmani is taking tech innovation to new heights, he still dreams of pursuing a different passion. Someday, he hopes to immerse himself in the study of physics once again.

“I really like what I’m doing and I still read physics books in my spare time, but I would love to go back and study physics, just for the pleasure of understanding how nature works,” he reflected. “It may be a distant dream now, but I would love to do that someday.”

But he’s not likely to have time for that anytime soon. In 2021, Loghmani took on his latest challenge, joining the new video service TikTok, where he leads brand advertising solutions with a team of product managers in China and the U.S. It was a unique, history-making opportunity he couldn’t pass up.

“TikTok is like Google 10 years ago,” he said. “It has exploded on the scene and that speed of innovation is exciting. TikTok is demonstrating that innovation in the consumer digital space is not a monopoly of American companies like Google, Facebook and Amazon. TikTok demonstrated that a Chinese company can also become globally accepted by consumers and I believe that breaking the barriers makes the world a better place.”

For Loghmani, the magic of innovation and product development in technology never gets old. More than 20 years into a successful career, he’s just getting started—still imagining the possibilities, enjoying the journey and finding inspiration in the challenges along the way. 

“I think there is satisfaction in finding a hard problem that you don’t know the answer to but you know it can be solved and attracting smart people to work with you to find a solution,” Loghmani explained. “It’s like a mountaintop. You see the mountaintop but the rest of it is covered in fog. You don’t know how you’re going to get there, but if you keep climbing, then one day you’re at the top. I like to imagine the big mountaintop and tell people, ‘Don’t be afraid of the fog, we’ll find our way.’”

 Written by Leslie Miller

S. James Gates, Jr. Endows New Summer Research Award

College Park Professor of Physics Sylvester James “Jim” Gates, Jr. joined the University of Maryland faculty in 1984, and as he rose to prominence in the fields of supersymmetry and supergravity—even being awarded the National Medal of Science in 2011—he never lost focus on his mission of educating the next generation of scientists.

Sylvester James Gates, Sr. and Charlie Anglin GatesSylvester James Gates, Sr. and Charlie Anglin Gates

Over 20 years ago, Jim launched the Summer Student Theoretical Physics Research Session (SSTPRS), which offers a summer long experience for students interested in conducting mathematical/theoretical physics research. Approximately 250 students have participated in the program since its inception, exploring areas of theoretical physics and publishing refereed journal articles on their research findings. SSTPRS also has allowed him to teach for fifty-one consecutive years. 

Now, Jim has created a new opportunity for undergraduates to conduct research by establishing the Sylvester James Gates, Sr. and Charlie Anglin Gates Endowed Summer Research Award. The award will support undergraduate students in physics or mathematics to pursue research during the summer break. 

Delilah Gates, Dianna Abney, Jim and Sylvester GatesDelilah Gates, Dianna Abney, Jim and Sylvester Gates

“I hope that the award, like the Summer Student Theoretical Physics Research Session, will help students gain acceptance to graduate school and enhance diversity in physics and mathematics, which is integral to advancing scientific discovery and innovation,” he said.

Jim named the award to honor the memory of his parents. When Charlie died of breast cancer at age 42, Gates, Sr. raised his four young children while serving full time in the U.S. Army. After more than 27 years of service, he retired as a sergeant major—the highest non-commissioned military officer rank. Gates, Sr. was one of the first African Americans to earn this position of authority. He went on to have two more careers in public education and as a union organizer. 

“I credit my father for emphasizing the importance of education and sparking my interest in science at a very young age,” he said.

Jim and his wife, Dianna Abney, sparked that same interest in their own children, twins Delilah Gates (B.S. ’15, physics and mathematics) and Sylvester Gates III (B.S. ’15, biological sciences). Both pursued undergraduate research while at UMD, and Delilah has since earned her Ph.D. in physics from Harvard University and is currently an associate research scholar at Princeton. Sylvester is currently a biological sciences Ph.D. student at UMD.

Jim, Dianna, Delilah and Sylvester see the scholarship as a way to encourage young people to do theoretical research, honor Jim’s parents, and to encourage other African American families to give to UMD.

Alicia Kollár Bridges Abstract Math with Realities of the Lab

Eugene Wigner, a Nobel Prize-winning mathematical physicist, once said, “The miracle of the appropriateness of the language of mathematics for the formulation of the laws of physics is a wonderful gift which we neither understand nor deserve.”

Indeed, mathematics may seem abstract or even irrelevant until it’s used to describe the natural world around us. The reverse is occasionally also true: Physical realities, when brought to a mathematician’s attention, can inspire new questions and new discoveries. 

The research of Alicia Kollár, a Chesapeake Assistant Professor of Physics at the University of Maryland and a Fellow of the Joint Quantum Institute, embodies the give and take of this relationship between physics and mathematics. In her lab, she brings abstract theories to life and in turn collaborates on new theorems. She has forged a research program of manipulating light on a chip, coaxing the light into behaving as though it lives on the surface of a sphere, or a mathematical abstraction known as a hyperbolic surface. She also collaborates with mathematicians, furthering both the understanding of what these chips can do and their underlying mathematics. 

Alicia KollárAlicia KollárA direct collaboration with pure mathematicians is uncommon for a physicist, particularly an experimentalist. But Kollár is no stranger to mathematics. Raised by two mathematicians in Princeton, New Jersey, she was exposed to the discipline early on. However, Kollár said her parents didn’t pressure her to pursue mathematics growing up. 

“It never crossed my dad’s mind to try to force me to do what he loved,” Kollár said. “He considered that pointless, like ‘You should go into research for you, not for somebody else’s expectations.’” 

Her father, János Kollár, a professor of mathematics at Princeton, had a slightly different take. 

“She was always interested in science, so I didn’t need to apply any influence,” he said. “If she was only interested in rock music it might have been different.”

Free to pursue whatever she pleased (short of rock music), Kollár studied advanced math, but without much enthusiasm. 

“I was fortunate to be able to take quite a bit of college-level pure math as a high schooler,” she said. “And I would say that I think I was good at it, but I didn’t love it. I just kind of didn’t care.” 

What really caught Kollár’s attention was physics. Her high school physics teacher’s style really resonated with her. 

“He was a crusty old dude that loved Far Side cartoons,” she recalled. “And he wouldn’t put up with anybody that was too cool for school. He taught non-calculus physics, but he taught that you have to think about it—not ‘Here’s a method learn how to do it.’ We became really good friends, and I really liked thinking about how it works, you know, the physical intuition part of physics.”

She attended college at Princeton University, remaining in her hometown and further developing her fascination with physics. 

“I was sort of divided between math and physics as a freshman,” Kollár said. “But the more physics I took, I never looked back.”

During her first summer research experience, she was charged with taking apart a telescope mount for a cosmology group. That’s when she found her calling as an experimentalist.  

“I had a lot of fun that summer,” she said, smiling. “I ended up building a 1500-pound steel support structure. I was up to my eyeballs in machine oil and loving every minute of it.”

When applying to graduate schools, Kollár’s soon-to-be Ph.D. adviser Benjamin Lev, now an associate professor of physics and applied physics at Standford University, called her and convinced her to join his lab. He enticed her with the promise that, as an atomic and optical physicist, she could do both theory and experiment side by side. She joined his group at the University of Illinois at Urbana-Champaign, and, in her first year, moved with the whole team to Stanford.

Kollár’s Ph.D. work consisted of building a novel experimental apparatus from scratch, designed to trap atoms and photons together and allow them to influence each other in significant, controllable ways. The resulting experimental setup launched a new direction in its field, according to Lev. 

“From beginning to end, it was just an amazing graduate school experience, where you see something from the inception of the idea to actually showing that this new experimental technique can work,” Lev said. “And she was always a thought partner. We were thinking through the ideas, writing the equations on the board, working with theorists, and she was an equal thought partner on all of that.”

After graduate school, Kollár found herself returning to Princeton. “Princeton is a black hole,” she said. “You can never quite leave. Maybe it’s the Hotel California, you know?”

She became a postdoctoral researcher in the lab of Andrew Houck, a professor of electrical and computer engineering and a Fellow in the Princeton Center for Theoretical Science. Houck worked with coplanar waveguides—little paths printed on a circuit board that confine light in a tube the thickness of a human hair. These paths have become the setting of many of Kollár’s mathematical explorations. 

Kollár was in her office one day, playing around with one of these coplanar waveguide chips. This one contained a waveguide lattice—a repeating grid, one waveguide after the other. Lattices are a familiar concept to physicists from the study of metals, where atomic nuclei form repeating patterns, extending in all three directions.

Kollar’s mathematical training bubbled up, flooding her brain with ideas. She envisioned a similar lattice, but instead of one dimension it would extend in two. And, she realized, thanks to the properties of coplanar waveguides, there was a lot of flexibility in the ways she could shape these grids.  

Instead of being points, as in a conventional lattice of nuclei in a metal, the sites of this lattice were paths—lines that guide light around. And, Kollár could bend and stretch these lines however she wanted without changing the underlying physics, as long as the total length stayed the same. 

Kollár realized that by scrunching and stretching these waveguides, she could connect them to each other in ways that aren’t possible for normal lattices of points, at least not in the world we are used to. Instead, the waveguides would act as though they are on the surface of a sphere, or a mathematical construction known as a hyperbolic surface, where traditional ideas of parallel lines, triangles and navigation break down.  

A hyperbolic surface is, in a sense, the opposite of a sphere. So much so that a two-dimensional hyperbolic surface can’t exist within our three-dimensional world—basically, it doesn’t fit. Kollár said the best way to imagine hyperbolic space is with some of M. C. Escher’s pictures. 

Kollár and her collaborators successfully showed that coplanar waveguides can indeed form lattices that act as though they live on a hyperbolic surface. 

Kollár found that these hyperbolic lattices had some cool physics properties. In particular, she found that they gave rise to something called flat bands—paradoxical places where, regardless of how fast a particle is moving, its energy stays the same. These flat bands are thought to be behind some of the most intriguing unexplained physical effects, like the fractional quantum Hall effect, spin-​liquids, and even some cases of high-temperature superconductivity. 

“When I discovered these flat bands, I actually thought I made a mistake in my code,” Kollár said, “I turned around to my lab partner, and I was like, ‘I think I messed up but if I didn’t, this is really cool.’ And so at the time, we didn't understand where that was coming from. What we've since come to understand is that was really just the tip of the iceberg.”

To understand the full potential of this new technique, Kollár joined forces with Peter Sarnak, professor of mathematics at the Institute for Advanced Study at Princeton. This collaboration has proved extremely fruitful. Together, they showed that the flat bands were far from a mistake. In fact, they proved that the flat bands must exist in any hyperbolic lattice of the kind Kollár creates.

“There's been this constant feedback between very general math theorems leading to good examples and then good examples leading to new math theorems,” Kollár said.

Now, she is leading her own group at UMD and is working on coupling bits of quantum information—called qubits—to these exotic lattices. She has assembled a group of like-minded students, interested in addressing novel physics. Although there’s no way to know exactly what the future holds for Kollár, it’s fair to anticipate that she will continue to follow her nose to interesting and unexpected places. 

“I think what was special about Alicia is that she always had her own mind and she did not want to follow what others were doing,” her father, János, said. “It can be frustrating when you're a two-year-old, but I think in the long run if you can follow your own mind very seriously it can work out very well.”

Written by Dina Genkina

Faculty, Staff, Student and Alumni Awards & Notes

We proudly recognize members of our community who recently garnered major honors, began new positions and more.

Faculty and Staff 
  • Ruba Abukhdeir joined the department as the Director of Business and Finance. 
  • Kaustubh Agashe, Mohammad Hafezi and Arpita Upadhyaya were elected Fellows of the American Physical Society.
  • Jesse Anderson retired on December 31 after 34 years with the department. 
  • Lea Bartolome received the department's Staff Excellence Award. 
  • Alessandra Buonanno received the Balzan Prize.
  • Sankar Das Sarma was named a highly cited researcher by Clarivate Analytics. He also wrote a commentary for Physics Today. He recently discussed the latest developments in topological phases in quantum computing at a Microsoft conference. 
  • Work by Jim Drake on the heliosphere was described in Phys.org.
  • James Ellsworth joined the department as assistant director for of procurement, inventory and receiving.
  • Sarah Eno was elected a Fellow of the American Association for the Advancement of Science. 
  • Manuel Franco Sevilla was named liaison between EF and Rare Processes and Precision Measurement group at Snowmass.
  • Victor Galitski was quoated in Physics magazine.  
  • Jim Gates received the 2021 AIP Andrew Gemant Award. He was also profiled in Symmetry Magazine.
  • Carter Hall was featured on the Department of Energy website regarding what his 2011 Early Career Award had meant to his research.
  • Donna Hammer was named a Society of Physics Students Outstanding Chapter Advisor. 
  • Eliot Hammer joined the chair's office as coordinator of administration.
  • Work by Anson Hook was described in Science Daily.
  • Ted Jacobson's idea of a black hole laser was discussed in PhysicsWorld.
  • Danae Johnson joined the department as a business manager.
  • Melanie Knouse received the department's Staff Excellence Award. 
  • Alicia Kollár received a Sloan Research Fellowship.
  • Wolfgang Losert received a Brain and Behavior Institute seed grant award.
  • Howard Milchberg, Daniel Woodbury (Ph.D., '20), Robert Schwartz wrote a Physics Today Quick Study showing how revisiting early experiments with new tech leads to pinpointing individual electrons in ambient gases. 
  • Rabi Mohapatra will retire on August 1, 2022.
  • Allen Monroe received the department's Staff Excellence Award. 
  • Johnpierre Paglione was named an Outstanding Referee of the Physical Review journals.
  • Naomi Russo received the department's Sibylle Sampson Award.
  • Jay Sau was named UMD co-Director of the Joint Quantum Institute.
  • Yasser Saleh joined the department as procurement coordinator.
  • Brian Straughn received the Lorraine DeSalvo Chair's Award for Outstanding Service.
  • Fred Wellstood will retire on April 1, 2022.
  • LaVita Williams joined the payroll office as a business service specialist.
 Students
  • Elizabeth Bennewitz, a graduate student working with Alexey Gorshkov, has been named a finalist for a 2022 Hertz Fellowship.
  • Yonatan Gazit and Yanda Geng received the Richard and Anna Iskraut Award.
  • Donovan Buterakos, Haining Pan, DinhDuy Vu won the Richard E. Prange Graduate Student Award.
  • Sagar Airen received the Kapo-Barwick Award.
  • Batoul Banihashemi, Yan Li, Braden Kronheim, Edward Broadberry, Jeremy Shuler, Subhayan Sahu, Saurabh Kadam, Nathaniel Fried received the Ralph Myers Award
Alumni
  • Vakhtang Agayan (Ph.D., '00) was named Chief Technology Officer of KMK Consulting
  • Beatriz Burrola Gabilondo (Ph.D., '10) was named an APS Equity, Diversion and Inclusion Fellow.
  • Laird Egan, (Ph.D., '21), was quoted in a Physics story on quantum error correction. 
  • Alexei Fedotov (Ph.D. ’97), received teh Dieter Möhl Medal in the field of beam cooling.
  • Salman Habib, Director at Argonne Lab's high energy division was a PhD student of mine (1988).
  • Ruth Kastner received a  Visiting Fellowship at the University of Pittsburgh's Center for Philosophy of Science.
  • Ying-Cheng Lai (Ph.D., '92) was named a Regents Professor at Arizona State University.
  • Thomas Mason, B.S. '89, physics; B.S. '89, electrical engineering  https://www.chemistry.ucla.edu/news/mason-group-research-featured-science-advances  
  • Elizabeth Paul (Ph.D., '20) and Matt Landreman published work on a twisty stellarator in Physical Review Letters.
  • Denjoe O'Connor (Ph.D. '85) is now the Director of Dublin Institute for Advanced Studies, the position Erwin Schrödinger held during World War II.
  • TC Shen (Ph.D. '85) is a professor of physics at Utah State University.
  • Chris Stephens (Ph.D. '86) is the director of the Center for Complexity Science at UNAM, Mexico City.
Book Marks

Victor Yakovenko's work in econophysics was discussed extensively in the book Anthill Economics.

Department Notes