Finite materials systems of reduced sizes exhibit specific forms of aggregation, phases, structures and morphologies, quantized electronic shell structures, dimensionality cross-over, and size-dependent evolutionary patterns, which are manifested in unique, nonscalable, size-dependent physical and chemical properties. Indeed, when the dimensions of materials structures are reduced to the nanoscale, emergent phenomena often occurs, that are not commonly expected, or deduced, from knowledge gained at larger sizes. Discovery, characterization, understanding and possible utilization of such emergent behavior of materials in the nanoscale are among the major challenges of modern materials science. Progress in theses directions is greatly facilitated, or even predicated, by synthesis, fabrication, separation and measurements of atomically precise nanostructures, and by theoretical investigations of their unique structural, chemical and physical properties. Computer-based quantum computations, simulations and emulations, are tools of discovery which enable uncovering emergent behavior in the nanoscale. In this talk we employ such simulations, often in conjunction with laboratory experiments, to explore some of the origins that underlie the unique behavior of size-selected materials in the nanoscale, and highlight computational microscopy investigations of nanoscale phenomena in diverse systems, ranging from: nanoscale liquid jets and bridges, droplet electro-crystallization, nanoclusters and machine-like response of their self-assembled superlattices, to symmetry-breaking manifested in formation of highly-correlated Wigner molecules in electron quantum dots, and exact numerical emulations of many-body microscopic hamiltonians, suggesting the employment of finite ultracold fermionic atom systems in fundamental studies of quantum magnetism, entanglement, and high-Tc superconductivity.
Events Calendar View
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Departmental/CSP Colloquium
Feb 23, 2017
Small is Different. Computational Microscopy and Emergence in the Nanos.
Guest: Prof. Uzi Landman, School of Physics, Georgia Institute of Technology
Thursday, February 23, 2017 4:00 pm - 5:00 pm
Location: Physics Auditorium (202) -
Departmental Colloquium
Mar 2, 2017
The Stratospheric Observatory For Infrared Astronomy (SOFIA): Studying the Universe while Traveling at Mach 0.85
Guest: Dr. James De Buizer, Stratospheric Observatory For Infrared Astronomy, NASA Ames Research Center
Thursday, March 2, 2017 3:30 pm - 4:30 pm
Location: Physics Auditorium (202)SOFIA is an airborne observatory that consists of a 2.7m telescope mounted in a heavily modified Boeing 747 aircraft. Flying at altitudes up to 45000 feet, SOFIA can get above enough of the atmosphere to open up a broad swath of infrared wavelengths for scientific investigation which are completely unobservable from the ground. SOFIA has a large suite of science instruments covering a broad range of wavelengths and spectral resolutions, which make the observatory capable of performing a huge breadth of astronomical science from the optical to far-infrared. SOFIA is just beginning its 5th annual observing cycle, and has already produced a host of interesting science results. In this talk, I will discuss what makes this such a unique observatory in both form and function, and will highlight some of the more interesting science results obtained so far. -
Observatory Open House
Mar 2, 2017
Observatory Viewing
Guest: Dr. J. Scott Shaw, UGA Department of Physics and Astronomy
Thursday, March 2, 2017 7:30 pm - 8:30 pm
Location: UGA Observatory (4th floor Physics Building)We will be having another public viewing on March 2, 2017. Because of the limited space in the dome, you must have a reservation to come to this showing. Click here to make a reservation.
The observatory is located at the top of the Physics building. To get to the observatory take the elevator to the 4th floor. A guide will meet you on the 4th floor and direct your group to the stairway that leads to the observatory. As the weather can be unpredictable, we might not know whether a viewing will be possible until shortly before the event begins.
If you need more information please call 706-542-2485.
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CSP Lunch Seminar
Mar 21, 2017
Mechanistic Insight into Oncogenic Mutations Using Molecular Dynamics Simulations
Guest: Ruan Zheng, Institute of Bioinformatics, University of Georgia
Tuesday, March 21, 2017 12:30 pm - 1:30 pm
Location: CSP Conference Room (322) -
Departmental Colloquium
Mar 23, 2017
Laboratory Astrophysics at Tokyo Metropolitan University
Guest: Prof. Hajime Tanuma, Department of Physics, Tokyo Metropolitan University
Thursday, March 23, 2017 3:30 pm - 4:30 pm
Location: CSP Conference Room (322)At Tokyo Metropolitan University, three distinct experimental techniques are being deployed to study ionic and molecular processes relevant to astrophysics.
A facility for multiply charged ion beam experiments with a 14.25 GHz electron cyclotron resonance ion source is used to measure charge exchange cross sections in collisions of multiply charged ions with neutral gases and to observe photon emission spectra under soft X-ray, extreme ultraviolet, and UV-visible irradiation. Currently we are interested in both solar wind charge exchange phenomena and spectroscopic data needed for the fusion reactor ITER.
Our electrostatic ion storage ring, which was constructed in 2004 as the world’s third such device, is a facility that has become popular among atomic and molecular physicists. Using this ring, we have studied cooling processes of hot (around 3000 K) molecular and cluster ions, produced in an ion source. We have also performed experiments for C6H-, which is found in interstellar clouds, and small carbon anions.
In a low temperature ion drift tube mass spectrometer, which can be operated at 4.3 K by using liquid helium, the mobility of atomic and small molecular ions in helium gas has been measured and the formation of helium cluster ions has been observed. We have observed elastic cross sections between molecular ions and He larger than the Langevin limit at very low energies. This phenomena might contribute to chemical evolution in interstellar clouds.
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Departmental Colloquium
Mar 30, 2017
Thank God for Nonlinearity. A 30,000 Feet View of the Nonlinear Dynamics of Many Particle Systems.
Guest: Prof. Surajit Sen, Department of Physics, State University of New York at Buffalo
Thursday, March 30, 2017 3:30 pm - 4:30 pm
Location: Physics Auditorium (202)Nonlinear dynamics is about 400 some years old. European monarchs of the time cared about their ships surviving the rough Atlantic waves and thus Euler, Lagrange, Newton, Cauchy and many others worked on nonlinear wave equations (which presumably predate the linear wave equation!). In the nineteenth and twentieth centuries, nonlinear systems have been worked on in terms of continuum equations and we know that many of these (integrable) equations admit so-called soliton solutions where solitons are traveling, non-dispersive lumps of energy (almost like quanta but classical). In 1955, Fermi-Pasta-Ulam-Tsingou studied a nonlinear mass-spring chain and showed that the system has great trouble equilibrating. In 1983, Nesterenko first examined impulse propagation through an alignment of elastic grains and showed these systems too support solitons/solitary waves. Does the perturbed granular chain system equilibrate? What does it physically mean to have a non-integrable system? And why do we even care? The talk will touch upon the history and the current state of nonlinear physics of many particle systems and what all this physics can give us in terms of new scientific insights and novel technology.
Parts of this work has been supported over time by the National Science Foundation and the Army Research Office. Many of the calculations have been done on the supercomputers at the Center for Computational Research at SUNY Buffalo.
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