Tag Archive for Kottos

Physics Faculty, Students Published in Physical Review

A paper written by two faculty members and three undergraduates was published in the American Physical Society’s Physical Review A, Volume 84, on Oct. 13.  Their paper was one of six highlighted in the publication’s Physics Focus and This Week in Physics. The paper is titled “Experimental study of active LRC circuits with PT symmetries.”

The authors include Tsampikos Kottos, associate professor of physics; Fred Ellis, professor of physics, Joseph Schindler ’12, Ang Li ’13 and Mei Zheng ’10.

The abstract of the paper is online here.

NSF Supports Kottos’s Optics Research

Tsampikos Kottos, associate professor of physics, received a grant worth $140,121 from the National Science Foundation on Sept. 1. The grant will support a project titled “IDR:Novel Photonic Materials and Devices based on Non-Hermitian Optics” through August 2014. Kottos is collaborating with faculty from Southern Methodist University, University of Central Florida, University of Arkansas and Yale University.

Tenure and Faculty Promotions Announced

Wesleyan is pleased to announce that during its most recent review, the Board awarded tenure to four faculty effective July 1, 2011.

Ulrich Plass

Ulrich Plass, associate professor of German studies, joined the Wesleyan faculty in 2004 as assistant professor. Plass is a specialist in German literature, literary criticism, and critical theory, with a particular focus on the works of the German philosopher Theodor Adorno. He conducted his undergraduate studies at the University of Hamburg, Germany; his M.A. is from the University of Michigan,

Air Force Funds Kottos’s Microresonator Study

Tsampikos Kottos, assistant professor of physics, received a grant worth $116,634 from the Department of the Air Force for a study titled “Ab initio approach to nonlinear dynamics of collective excitations in networks of coupled optical Microresonators.” The grant will be applied through July 2013. The grant is shared with CUNY College.

West ’11, Kottos Published in Physical Review Letters

Carl West ’11, Tsampikos Kottos, assistant professor of physics, and Tomas Prosen of the University of Ljubljana in Slovenia, are the co-authors of an article titled “PT-Symmetric Wave Chaos,” published in Physical Review Letters 104 in 2010.

“This work studied the universal properties of this crossover and demonstrated that a simple scaling function could embody the effects of such dramatically different changes as increasing the system size, varying the initial energy, or having varying degrees of imperfections / disorder in the system,” West explains. “While these results were obtained from a toy model, they carry direct applications to optics where the balanced use of gain and loss has become a booming field over the past years, yet general questions of the effects of disorder or system size scaling were as of yet unknown.”

Kottos Group Co-Authors Paper on Fidelity in Quasi Systems

Tsampikos Kottos, assistant professor of physics; Joshua Bodyfelt Ph.D ’09; and Mei Zheng ’10 are the co-authors of the paper “Fidelity in Quasi-1D Systems as a Probe for Anderson Localization,” published in Acta Physica Polonica A, Proceedings of the 4th Workshop on Quantum Chaos and Localisation Phenomena, Warsaw, in 2009. They wrote the paper with Ulrich Kuhl, and Hans-Jürgen Stöckmann, who are collaborators from the University of Marburg.

This publication is part of the conference proceedings for a workshop at the Polish Academy of Sciences in Warsaw where Kottos presented this past summer. The combined theoretical and experimental work done in this project put forward a method for which the celebrated phenomenon of Anderson Localization could be detected through a measure known as Fidelity, which is typically thought of as probing the stability of a system against external perturbations. This work will constitute a large part of Zheng’s senior physics thesis.

Kottos, Ng ’08 Authors of Paper on Ultra-Cold Atoms

Tsampikos Kottos, assistant professor of physics, and physics and mathematics major Gim Seng Ng ’08 are co-authors of “Avalanches of Bose-Einstein condensates in leaking optical lattices,” published in New Journal of Physics, 11, 073045 in 2009. The paper is about novel properties of Bose-Einstein condensates (ultra-cold atoms) in open systems. This project constituted a large part of Ng’s senior honors thesis in physics.

Kottos Authors Article on Quantum Mechanical Systems

Tsampikos Kottos, assistant professor of physics, is the co-author of “Exponentially Fragile PT-Symmetry in lattices with Localized Eigenmodes,” published in Physical Review Letters 103,030,402 in 2009. The paper discusses the effects of disorder on a previously excluded class of quantum mechanical systems.

Physics Group Published in Physical Review Letters

Tsampikos Kottos, assistant professor of physics; Moritz Hiller, a former visiting scientist; and Katrina Smith-Mannshott BA ’08, MA ’09 are the co-authors of the article, “Occupation Statistics of a BEC for a Driven Landau-Zener Crossing,” published in Physical Review Letters, Issue 102, in 2009.

Kottos Co-Author Article in Physics Publication

Tsampikos Kottos, assistant professor of physics, and Moritz Hiller are co-authors of the article “Wave-packet dynamics in energy space of a chaotic trimeric Bose-Hubbard system,” published Physical Review A Issue 79, No. 023621 in 2009.

Mishara-Blomberger ’11, West ’11 Receive Goldwater Scholarships

From the day Carl T. West ’11 arrived on Wesleyan’s campus, he wanted to study the fundamentals of quantum mechanics.

Although reluctant at first, Tsampikos Kottos, assistant professor of physics, welcomed the eager frosh to his “Complex Quantum Dynamics and Mesoscopic Phenomena” research group.

“To be honest, Carl was a kind of an experiment, for me,” Kottos says. “I usually take sophomores and above at my group, but Carl was so confident on what he wanted, so I decided to involve a freshman in our research. It was a good and decision.”

Carl T. West '11

Carl T. West '11

In the past two years, West wrote an article that was accepted to an international physics journal, presented research to the American Physical Society, and worked out a system dealing with quantum chaos studies with results Kottos had not seen before. And in April, West, along with Jonas Mishara-Blomberger ’11, received a Barry M. Goldwater Scholarship for the 2009-10 academic year.

The Goldwater Scholarship Award, established by Congress in 1986, is the most prestigious national undergraduate scholarship in mathematics, physics and engineering. Of the 1,097 applicants nominated by faculty members, only 278 students were selected to receive the scholarship.

West, a mathematics, physics and philosophy triple major, and Mishara-Blomberger, a mathematics and physics double major, will each receive a $7,500 scholarship to help cover the cost of tuition, fees, books, and room and board for their junior and senior year. They will join Kottos at the Max-Planck Institute in Göttingen, Germany this summer.

“It is very exciting for me to receive the Goldwater Fellowship because it is both a great honor and also gives me encouragement to continue pursuing my goals to do research in physics and mathematics,” Mishara-Blomberger says.

Jonas Mishara-Blomberger '11

Jonas Mishara-Blomberger '11

Mishara-Blomberger applied for the Goldwater scholarship while working with Assistant Professor of Physics Greg Voth’s research group on dynamic phenomena of granular gasses. By vibrating a glass chamber filled with 3mm-wide glass spheres, the Voth lab achieved a system of macroscopic particles that have similar properties to a gas.

“Whereas in a gas, you usually cannot acquire data of individual molecules, in our quasi-2-dimensional granular gas we can measure the trajectories of every particle. This direct measurement allows us to calculate variables like pressure, stresses, and viscosity of our system at any given height and time,” Mishara-Blomberger explains.

He will join Kottos’ group this summer to study current relaxation for systems with phase transition (for example how light intensity decays out of a leaking cavity filled with random scatterers).

“It is one of the research lines very close to the same family of problems that Carl and former students have worked on in the past,” Kottos explains. “I am optimistic that Jonas will also come up with a new strong result.”

West will begin a new project, studying how an initial excitation, evolves in time for two systems which are very similar to one-another. This study aims to quantify the sensitivity of dynamics of a complex mesoscopic system to small perturbations. These perturbations are associated with fabrication errors of the mesoscopic device, changes in the environmental temperature etc.

“Here the systems are too big to describe using exact Quantum mechanics, but too small for Newtonian mechanics to work well either. So, these systems allows us to probe fundamental types of questions regarding the agreement of classical and quantum descriptions of chaos,” West explains. “In fact, we are even able to examine the dynamics, that is, how the system changes in time, which is an exceptionally difficult problem.”

In 2008, Goldwater Scholarships went to Noah Biro ’09 a molecular biology and biochemistry and sociology double major, and Alison Ringel ’09, a molecular biology and biochemistry and physics double major.

“This continues the great 2008 success of our Wesleyan undergraduates in the annual competition,” says Reinhold Blumel, the Charlotte Augusta Ayers Professor of Physics, chair of the Physics Department. “Both Jonas and Carl are doing great work in physics, and this, no doubt, attests to Wesleyan’s strength in the sciences and mathematics.”

After Wesleyan, West hopes to pursue a Ph.D in physics and become a research professor; whereas Mishara-Blomberger is planning to attend graduate school for either mathematics or theoretical physics.

“I feel very strongly that my getting this award reflects the strength of Wesleyan’s Physics Department and the amazing commitment we have to undergraduate research,” West says. “What I have been able to do in the past four semesters is totally impossible at most major universities, but here at Wes it is not only doable but encouraged.”

In addition to sharing the Goldwater Scholarship, Mishara-Blomberger and West also received the Johnston Prize in 2008. The prize is awarded to those first-year students or sophomores whose performance in their first two semesters of physics shows exceptional promise.

In April 2009, they  each received the Karl Van Dyke Prize, awarded each year to one or more students either majoring in physical science or having a predominant interest in physical science and technology, and who show outstanding achievement in academic work and a promise of productivity in a professional career. They were nominated by faculty in the Physics Department.