In Memoriam

Details

Published: Friday, January 17 2020 05:56

It is with much sadness that the Department of Physics announces the passing of several members of our community.

Janet Das Sarma (1971-2019) managed the Condensed Matter Theory Center for the last decade. She received the department’s Staff Excellence Award in October. More

Leona Dunklee (1926-2019) was an account clerk in the Department of Physics who supported the electronic development group and was active in planning departmental events.

Hans R. Griem (1928-2019), a noted expert in high-temperature plasmas and spectroscopy, served on the UMD faculty from 1957 to 1994. He was a consultant with Los Alamos National Laboratory. More

Udayaditya “Yudi” Konwar (1997-2019), an international student from Assam, India, would have been a junior physics major this year.

Don Langenberg (1932-2019) was a physicist, the Chancellor of the University System of Maryland from 1990 to 2002, and in recent years an active voice for education at the National Academies. More

Susanne Misner (1933-2019) is survived by her husband, Professor Emeritus Charles Misner. The couple donated proceeds from the sale of correspondence with Stephen Hawking to establish the department’s Weber Endowment for Gravitational Physics.

Lawrence A. Schmid (1928-2019) was a longtime NASA physicist who contributed to the Apollo Lunar Landing. He was a generous donor to undergraduate education in UMD’s Department of Physics.  

Joseph Sucher (1930-2019) was a Distinguished Scholar-Teacher and the poet laureate of the department. He established the Joseph and Dorothy Sucher Graduate Prize in Relativistic Theoretical Physics. More

Peter Hawley Walpole (1947-2019) was a physicist who worked on the Cosmic Ray Energetics and Mass (CREAM) and Boron And Carbon Cosmic rays in the Upper Stratosphere (BACCUS) experiments. 

Gaurang Yodh (1928-2019) was a UMD Physics Professor from 1961 to 1988 before moving to the University of California, Irvine. More

Recent Alumnus Zachary Eldredge Studies Solar Energy as ORISE Fellow

Details

Published: Friday, January 17 2020 02:56

As a student, Zachary Eldredge (Ph.D. ’19, physics) examined the use of quantum mechanics to improve measurements.

“If you nZach Eldredge. Photo by Faye Levine.eed to know the difference in some quantity between two points, a common method is to measure the quantity at each point and then subtract,” Eldredge explained. “Instead, we developed methods to measure the difference directly. Our methods are more accurate because we only measure once, not twice.”

After graduating last May, Eldredge took this expertise and his strong physics foundation to the Department of Energy’s Solar Technologies Office, which aims to make solar energy less expensive and more accessible and increase the amount of renewable energy in the United States. He spent seven months working in the office as an Oak Ridge Institute for Science and Education (ORISE) Fellow and is now a technology manager.

“The process of how technologies progress from lab science to usable products is really interesting to me and was important to my quantum research, as quantum technology is trying to make that same leap at the moment,” he said. “In addition, physics has been a wonderful foundation. A good physics education prepares you to pick out the relevant patterns and generalize knowledge really quickly, and it's been a great help in giving me the background to get up to speed on all kinds of other technologies.”

Eldredge knew early on in his studies that he was interested in finding a science policy job to align with his interests in climate, renewable energy and technology development. 

“I really wanted to shift gears from my academic work into something more climate focused, and the ORISE fellowship provided a great opportunity.”

During his time at Maryland, Eldredge co-authored nine publications, including three first-author papers published in the journals Physical Review A and Physical Review Letters. 

“I’m proud to say that two of Zach’s papers are the highlights of my own research over the past few years,” said Alexey Gorshkov, Eldredge’s advisor who is an adjunct associate professor in the Department of Physics and a physicist at the National Institute of Standards and Technology. “In fact, these two papers are so promising that we filed patents for the corresponding ideas, all having to do with the harnessing of the peculiarities of quantum mechanics for technologies such as powerful computing, secure communication and superior sensing.”

In addition to his work in the lab, Eldredge served as president of the social activism group Science for the People UMD and as a member of the Graduate Student Government. 

“Not only is Zach an excellent physicist, he was also an excellent citizen of the department,” said Steve Rolston, professor of physics and department chair. “He was one of the most active members of our self-organized graduate student committee, which strives to make graduate school as positive an experience as possible.” 

Eldredge also participated in public outreach activities, such as the American Physical Society’s Congressional Visits Day, the USA Science & Engineering Festival, and UMD’s Maryland Day. 

“I felt I had a duty as a publicly funded scientist at a major public university to reach out and talk to people, because the knowledge I gained there belongs to everyone,” Eldredge said. “When we discover amazing things, it is on us to communicate about them to the public.”

Written by Chelsea Torres

Fifth Edition of “Exploring Quantum Physics” to Launch on Coursera

Details

Published: Tuesday, January 14 2020 08:55

Charles Clark and Victor Galitski will launch the fifth edition of their Coursera class on quantum physics Jan. 20, 2020. Alireza Parhizkar, a UMD graduate student will serve as teaching assistant.

“The course begins by establishing the conceptual grounds of quantum mechanics and promises an exciting journey,” says Parhizkar, who joined Galitski’s research group in the summer of 2019. “It fulfills this promise by immersing the learner in advanced subjects of quantum physics, like superconductivity and path integrals, and illustrating them with colorful exercises.”   Two JQI Fellows will launch the fifth edition of "Exploring Quantum Physics" on Coursera Jan. 20. (Credit: Anna Bogatin)

The free course, titled “Exploring Quantum Physics,” explains topics in quantum physics at a level appropriate for an advanced undergraduate or beginning graduate student. The previous four editions had a total of about 100,000 enrollees, with roughly 2,000 people completing the course. “That’s a good number for a massive open online course, or MOOC,” says Clark, who is an Adjunct Professor of Physics, a Fellow of the Joint Quantum Institute (JQI), and a Fellow at the National Institute of Standards and Technology in Gaithersburg, Maryland. Clark adds that the new edition of the course has a revised grading system as well as updated homework and exam questions.

“Exploring Quantum Physics” consists of eight weeks of video lectures, with a number of five- to fifteen-minute videos per week. The videos include voluntary ungraded quizzes, which automatically pause the presentation so that students have an opportunity to answer relevant questions. There are also weekly homework assignments—some will include reading historical papers by influential early quantum scientists such as Albert Einstein and Niels Bohr—as well as a final exam. “We tried to strike a balance between providing a historical perspective on the early development of quantum physics and modern concepts,” says Galitski, who holds the Chesapeake Chair of Theoretical Physics at the University of Maryland (UMD).

An advantage of MOOCs is that the course material is available to anyone, including some students who are younger than traditional undergraduates. Khadija Niazi and her twin brother Muhammad, who grew up in Pakistan, were 13 years old when they enrolled in an earlier edition of the course. Khadija, who once spoke about her experience with MOOCs at the World Economic Forum, says that she “thoroughly enjoyed that course [e]specially because of the peer's help and Charles Clark's constant help and encouragement in the forums.” Before beginning the quantum physics course, the twins had completed some introductory physics classes on the site and learned some calculus from videos on YouTube. Muhammad says that they wanted “to get a taste of what lies ahead.”

Both Niazi siblings stayed in contact with Clark after completing the class. Muhammad, who went on to publish his first experimental physics paper in the journal Royal Society Open Science when he was 16, says he will probably take the new edition of the course to solidify his understanding of the content.

Michael Winer, a physics graduate student at UMD, took an earlier edition of the course when he was a 10th grader at Montgomery Blair High School in Silver Spring, Maryland because he hoped to do physics research over the summer. “By far the greatest thing that came out of my taking the course was that I contacted professor Galitski and did research with him for two summers,” Winer says. “This was my first real research experience, and taught me a lot about the scientific process.” That work led Winer to win the Intel Science Talent Search competition in 2015, earning him a prize of $150,000 and a meeting with President Obama.

“Exploring Quantum Physics” is now open for enrollment. To learn more about the course and to see a detailed syllabus, please visit the landing page at Coursera.

Original story by by Jillian Kunze

• Charles Clark:This email address is being protected from spambots. You need JavaScript enabled to view it.
• Victor Galitski: This email address is being protected from spambots. You need JavaScript enabled to view it.
  
• Alirea Parhizkar: This email address is being protected from spambots. You need JavaScript enabled to view it.

Physics in Florence

Details

Published: Friday, December 13 2019 14:35

As part of the University of Maryland’s Education Abroad program, eligible students are welcome to apply for the the Physics in Florence semester, held at the International Studies Institute (ISI). Prof. Luis Orozco has been responsible for the program, which enrolled 12 students in the Fall of 2019. The curriculum includes three physics classes, an Italian language course, and an elective such as studio art, art history, history and political science, Italian language and literature, international business, and interdisciplinary studies in the humanities.  

One of this fall’s highlights was a visit to the Biblioteca Nazionale, located near the ISI.  Orozco and the students were able to see several of Galileo's original documents, including his log of experiments with inclined planes, his drawings of Jupiter's moons, and his watercolor of the moon's phases.

Another trip was to Geneva, where the students visited CERN. At the Compact Muon Solenoid (CMS) experiment, UMD postdoc Markus Seidel gave the students a tour of the detector, and graduate student Nathan Evetts of the University of British Columbia explained the workings of the Antiproton Ring. 

David Reitze, director of the U.S. gravitational observatory (LIGO), helped arrange a visit to the European Gravitational Observatory (EGO) near Pisa. Valerio Boschi hosted the students and explained the Virgo instrument and its interaction with the two LIGO interferometers in Louisiana and Washington state. After Boschi provided an extensive tour, EGO director Stavros Katsanevas met the students and discussed the current and future physics goals of EGO. 

Near the end of the term, students visited the Galileo Museum, in the Palazzo Castellani near their ISI classes.  The museum houses intriguing scientific instruments, including those of the Medici and the Grand Dukes of Tuscany. Examples include sextants, astrolabes, solar clocks, globes of various orientations, thermometers, telescopes, vacuum pumps and a Ptolemaic mechanical model showing the universe rotating around the earth.  Maps from the 16th century show remarkable accuracy, particularly for the east coast of North America and both sides of South America. Explorers Amerigo Vespucci and Giovanni da Verrazano were both natives of Florence.

At the center of the museum, the Galileo room highlights his contributions to mechanics with a reproduction of one of the inclined plane machines that he used to measure the relationship between time and distance under acceleration. There are also good references to his astronomical observations, with one of the original lenses of his telescope in place.

On a painted table of chemical affinities, the class spotted a symbol that looks like an h bar (ℏ, or Planck’s constant). Having learned about Planck’s constant in class, the students wondered about the symbol’s origin. Orozco found that it was originally a sickle, and that it had stood for lead in alchemy and for Saturn in astrology. Why had Planck called it h? Orozco found that it may reference Hilfsgröße, which is the concept of a “helpful quantity.” This helpful quantity has opened a new world of understanding, much as Galileo did when he found that the distance traveled in fixed time intervals on his inclined plane is proportional to odd numbers (1,3,5,7, etc.)—a classical and early lesson in physics.

For further information about Physics in Florence, contact Lindsey Sitler, This email address is being protected from spambots. You need JavaScript enabled to view it..

Trips to the Biblioteca Nazionale,CERN, EGO and the Galileo Museum are shown in these photos by Adam Dirccam, Anthony Giuffre, Stefano Baldassarri, Sean Markey and Cameron Moneypenny.

Galileo's watercolor of the moon's phases. 

Galileo's log of experiments with inclined planes.

His drawings of Jupiter's moons.

Bibloteca Nazionale, Florence.

Galileo's manuscripts, Biblioteca Nazionale.

Markus Seidel with students at the CERN CMS experiment.

Nathan Evetts describes the cooling process at CMS.

Markus Seidel and students at CMS.

Lunch at CERN.

Cessy, France, at the Jura Mountains.

Water jet in Geneva.

With safety gear at CERN.

Nathan Evetts explains the Antiproton Decelerator.

Outside the Proton Synchrotron, with Mont Blanc in the background.

In the EGO control room, Valerio Boschi points to monitors displaying the Virgo lock system, the instrument's mirrors, and the spectral density of the noise detected.

One of Virgo's 3km arms.

The other 3km arm.

The inside of the 3km tunnel.

At the Virgo experiment.

A sextant used for navigation, displayed at the Galileo Museum.  

Solar clocks at the Galileo Museum.

Armillary sphere, showing the geocentric (Ptolemaic) model of the universe, with the earth at the center. Galileo Museum.

A map of the world from the early 15th century at the Galileo Museum.

Bust of Galileo Galilei by Carlo Marcellini at the Galileo Museum.

Relics of Galileo.  

Refracting telescopes shown at the Galileo Museum.  

Tabula affinitatum, showing the properties of various chemicals. Circa 1766.  

Janet Das Sarma, 1971 - 2019

Details

Published: Wednesday, December 04 2019 13:53

Janet Das Sarma, who managed the Condensed Matter Theory Center (CMTC) for the last decade, died on December 2, 2019 at the age of 48 years.

She received a diagnosis of stage 4 metastatic cancer in 2016 and was given a four-month life expectancy, but lived 43 months while undergoing nine separate therapies. Despite these grueling protocols, she continued to carry out all her CMTC duties. On October 25th, she was honored at the Physics staff awards luncheon for her comprehensive efforts in moving the CMTC from the Toll to the Atlantic Building. Her disease took a sudden, decisive bad turn in early November, and she died in December at home, looking at her favorite garden.

Janet ensured that CMTC faculty, postdocs, students and visitors could pursue their scientific interests unhindered by bureaucratic inconvenience. Her careful handling of applications and recommendations helped an immense number of CMTC alumni secure their professorial appointments at various institutions.

She regarded as her greatest accomplishment the raising of her sons, Andrew and Matthew.