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Click here for:Date: | Monday |
Time: | 3:30 PM |
Place: | PS 355 |
Inquiries: | mario.borunda@okstate.edu |
Date: | Thursday |
Time: | 1:30-3:00 PM |
Place: | 106 B Studio Room, Classroom Building, OSU |
& Nielsen Hall, Room 103, OU | |
Inquiries: | kaladi.babu@okstate.edu or kao@nhn.ou.edu |
Date: | Thursday |
Time: | 3:30-4:30 PM |
Place: | PS 101 |
Inquiries: | girish.agarwal@okstate.edu or s.nandi@okstate.edu |
Date: | Friday (bi)weekly |
Time: | 2:00 PM |
Place: | PS 147 |
Inquiries: | perk@okstate.edu or girish.agarwal@okstate.edu |
No talks scheduled
No talks scheduled
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No talks scheduled
First week of classes
No colloquium scheduled.
Second week of classes.
Speaker: | Dr. Şahin Kaya Özdemir |
Department of Electrical & Systems Engineering | |
Washington University in St. Louis | |
Date: | Thursday, August 30, 2012 |
Time: | 3:30 PM |
Place: | PS 101 |
Title: | Whispering Gallery Microresonators and Microlasers for Detecting and Measuring Nanoscale Objects |
Whispering-Gallery-Mode (WGM) optical microresonators, with their microscale mode volumes and ultra-high-quality factors, have shown great promise for applications in various fields of science, spanning from atom-cavity coupling and optomechanics to on-chip microcavity lasers and label-free bio-chemical sensing. In this talk, after briefly introducing the physical concepts behind these resonators, I will highlight some of the milestone applications with an emphasis on sensing with high resolution. I will then report how the WGM resonators and microlasers can be used to detect and measure individual nanoscale objects, e.g., nanoparticles, viruses and biomolecules. I will end the talk discussing some of the opportunities and challenges.
Note: The traditional student-speaker chat will begin in Physical Sciences Room 147 at 3.00 PM. All students are welcome! Refreshments will be served.
Speaker: | Dr. Shmuel Fishman |
The Shlomo Kaplansky Academic Chair | |
Department of Physics | |
Technion, Haifa, Israel | |
Date: | Thursday, September 6, 2012 |
Time: | 3:30 PM |
Place: | PS 153 |
Title: | Dynamics in Random Potentials: From Anderson Localization to Hyper-transport |
Random potentials may localize particles as a result of interference. This is Anderson localization, taking place for time independent potentials. In time dependent potentials, Anderson localization is destroyed and hyper-transport, namely transport faster than ballistic, takes place. Hyper-transport is classified into universality classes. The work was motivated by experiments in optics and in atom optics that will be described as well.
Note: The traditional student-speaker chat will begin in Physical Sciences Room 147 at 3.00 PM. All students are welcome! Refreshments will be served.
Speaker: | Dr. Shmuel Fishman |
The Shlomo Kaplansky Academic Chair | |
Department of Physics | |
Technion, Haifa, Israel | |
Date: | Friday, September 7, 2012 |
Time: | 2:00 PM |
Place: | PS 147 |
Title: | Tunneling out of Phase Space Islands of Maps |
Speaker: | Kimball A. Milton |
George Lynn Cross Research Professor of Physics | |
Homer L. Dodge Department of Physics and Astronomy | |
University of Oklahoma | |
Date: | Thursday, September 13, 2012 |
Time: | 1:30 PM |
Place: | 106 B Studio Room, Classroom Building, OSU |
& Nielsen Hall, Room 103, OU | |
Title: | Developments in Casimir–Polder Repulsion—Three-body Effects |
Speaker: | Dr. Flera Rizatdinova |
Department of Physics | |
Oklahoma State University | |
Date: | Monday, September 17, 2012 |
Time: | 3:30 PM |
Place: | PS 355 |
Topic: | High Energy Physics |
Speaker: | Dr. Santosh K. Rai |
Department of Physics | |
Oklahoma State University | |
Date: | Thursday, September 20, 2012 |
Time: | 1:30 PM |
Place: | 106 B Studio Room, Classroom Building, OSU |
& Nielsen Hall, Room 103, OU | |
Title: | Colored Exotics at the Large Hadron Collider |
Speaker: | Dr. Alexander Khanov |
Department of Physics | |
Oklahoma State University | |
Date: | Thursday, September 20, 2012 |
Time: | 3:30 PM |
Place: | PS 101 |
Title: | The Higgs Discovery |
On July 4, 2012, two CERN experiments, ATLAS and CMS, announced observation of a new particle with a measured mass of 126 GeV. The excess of events observed by the experiments is compatible with production and decay of Higgs boson, the long sought missing piece of the Standard Model. The OSU High Energy Physics experimental group is part of the ATLAS collaboration. I will discuss the details of this discovery, why it is so important, and what we are going to do next.
Note: The traditional student-speaker chat will begin in Physical Sciences Room 147 at 3.00 PM. All students are welcome! Refreshments will be served.
Speaker: | Dr. Brian P. Grady |
School of Chemical, Biological & Materials Engineering | |
University of Oklahoma | |
Date: | Thursday, September 20, 2012 |
Time: | 3:30 PM |
Place: | PS 103 |
Title: | Carbon Nanotube-Polymer Composites: Effect of Nanotubes on Polymer Physics |
Carbon nanotubes are in many ways similar to polymers. Both molecules have contour lengths typically on the order of 1 micron, and, for single-walled tubes, diameters between 0.5 and 1 nm. In terms of physics, the significant difference between the two is the significantly larger inflexibility of a nanotube, which is quantified by an orders-of-magnitude larger persistence length. This talk will describe how nanotube and polymer physics interact with one another in composites of the two materials. While the talk will focus on work done in the author’s lab, important studies done by others will also be discussed. The author will also briefly discuss how these physics affect commercial products that contain nanotubes and finally discuss the challenges that still remain in this area.
Note: Refreshments served at 3:00 PM, Room 117 PSI.
Speaker: | Dr. Gil Summy |
Department of Physics | |
Oklahoma State University | |
Date: | Monday, September 24, 2012 |
Time: | 3:30 PM |
Place: | PS 355 |
Topic: | Bose Einstein Condensation |
Speaker: | Dr. Howard A. Baer |
Homer L. Dodge Professor of High Energy Physics | |
Homer L. Dodge Department of Physics and Astronomy | |
University of Oklahoma | |
Date: | Thursday, September 27, 2012 |
Time: | 1:30 PM |
Place: | 106 B Studio Room, Classroom Building, OSU |
& Nielsen Hall, Room 103, OU | |
Title: | Radiative Natural SUSY: Reconciling Electroweak Finetuning with the Higgs Discovery |
Speaker: | Dr. Ayyalusamy Ramamoorthy |
Michigan Nanotechnology Institute for Medicine and Biological Sciences | |
Departments of Chemistry & Biophysics | |
University of Michigan | |
Date: | Thursday, September 27, 2012 |
Time: | 3:30 PM |
Place: | PS 101 |
Title: | Dynamic Structures of Membrane Proteins by NMR Spectroscopy |
Membrane proteins are an exciting class of biomacromolecules and play important roles in a variety of biological processes that are directly linked to major diseases including cancer, aging-related diseases, and infectious diseases. A complete understanding of their function can only be accomplished using high-resolution structures. In spite of recent developments in structural biology, membrane proteins continue to pose tremendous challenges to most biophysical techniques. A major area of research in my group is focused on the development of NMR techniques to study the dynamic structures of membrane bound proteins such as cytochrome b5, cytochrome P450 and cytochrome P450-reductase. In my talk, I will present strategies to study the structure and dynamics of these challenging systems and also on the electron transfer mechanism that enables the enzymatic function of P450. Atomic-level resolution NMR structures of amyloidogenic proteins revealing the misfolding pathway and early intermediates that play key roles in amyloid toxicity will also be presented.
References:
Note: The traditional student-speaker chat will begin in Physical Sciences Room 147 at 3.00 PM. All students are welcome! Refreshments will be served.
Speaker: | Dr. Mario Borunda |
Department of Physics | |
Oklahoma State University | |
Date: | Monday, October 1, 2012 |
Time: | 3:30 PM |
Place: | PS 355 |
Topic: | Quantum Information |
Speaker: | Dr. Kyu Jung Bae |
Homer L. Dodge Department of Physics and Astronomy | |
University of Oklahoma | |
Date: | Thursday, October 4, 2012 |
Time: | 1:30 PM |
Place: | 106 B Studio Room, Classroom Building, OSU |
& Nielsen Hall, Room 103, OU | |
Title: | Peccei–Quinn NMSSM in the Light of 125 GeV Higgs |
Speaker: | Dr. A. Kaan Kalkan |
School of Mechanical and Aerospace Engineering | |
Oklahoma State University | |
Date: | Thursday, October 4, 2012 |
Time: | 3:30 PM |
Place: | PS 101 |
Title: | Solar Water Splitting Using Nanowire-Nanoparticle Conjugates |
It takes 1.23 eV to cleave a water molecule. This energy is affordable by near infrared as well as visible photons, being the major constituents of solar radiation. However, water does not absorb in the near infrared and visible. Two electrochemists, Fujishima and Honda, shook the World in 1972, when they showed a visible photon could first be absorbed in a photocatalyst generating an excited electron-hole pair, which subsequently could drive a reduction and oxidation reaction splitting H2O to H2 and O2 (photolysis). Since then, however, a stable photolytic device with an energy conversion efficiency of more than few percent could not be realized. This 40-year struggle with no success taught us photocatalytical splitting of water involves the following challenges, which are difficult to meet all at the same time: i) efficient channeling of photogenerated electrons and holes to redox reactions at the interfaces; ii) efficient absorption of sunlight; iii) avoidance of photo-oxidation of the photocatalyst. The present seminar is about photolytic a device concept that consists of an oxide semiconductor nanowire decorated with metal nanoparticles. The concept is promising of high photolytic conversion energy by making use of multifunctional nanostructures with unique electronic, photonic, and plasmonic attributes at the nanoscale. Further, the devices can be manufactured by a low-cost technology, simply by fabricating and utilizing the nanowire-nanoparticle conjugate devices in the form of a suspension (e.g., in water). The nanowires and nanoparticles can be synthesized via simple sol-gel and reduction chemistries, respectively. The proof of the concept has utilized vanadium oxyhydrate (V3O7·H2O) nanowires decorated with Au nanoparticles. Reproducible conversion efficiency of 5.3% (i.e., for hydrogen generation from water) is recorded for the first hour of photolysis under 470 nm blue light. ‘True’ photolysis is achieved with H2:O2 ratio of 2.0.
Note: The traditional student-speaker chat will begin in Physical Sciences Room 147 at 3.00 PM. All students are welcome! Refreshments will be served.
Friday, October 5, Student’s Fall Break
Speaker: | Dr. Robert Hauenstein |
Department of Physics | |
Oklahoma State University | |
Date: | Monday, October 8, 2012 |
Time: | 3:30 PM |
Place: | PS 355 |
Topic: | Molecular Beam Epitaxy |
Speaker: | Dr. Satyanarayan Nandi |
Department of Physics | |
Oklahoma State University | |
Date: | Thursday, October 11, 2012 |
Time: | 1:30 PM |
Place: | 106 B Studio Room, Classroom Building, OSU |
& Nielsen Hall, Room 103, OU | |
Title: | Quark Lepton Unification at the TeV Scale |
Speaker: | Dr. James. P. Shaffer |
Homer L. Dodge Department of Physics & Astronomy | |
University of Oklahoma | |
Date: | Thursday, October 11, 2012 |
Time: | 3:30 PM |
Place: | PS 101 |
Title: | An Atomic Candle for Microwave Electric Field Measurement |
Atom-based standards for length and time as well as other physical quantities such as magnetic fields, show clear advantages by enabling stable and uniform measurements. Here we demonstrate a new method for measuring microwave electric fields based on quantum interference in a Rubidium atom. Using a bright resonance prepared within an electromagnetically induced transparency window we could achieve a sensitivity of ∼ 30 μV cm−1 Hz−1/2 and demonstrate detection of microwave electric fields as small as ∼ 8 μV cm−1 with a modest setup. The sensitivity is currently limited by the stability of our lasers and can be significantly improved in the future. Our method can serve as a new atom based traceable standard for microwave electrometry, its reproducibility, accuracy and stability promising advances towards levels comparable with those currently attained in magnetometry.
Note: The traditional student-speaker chat will begin in Physical Sciences Room 147 at 3.00 PM. All students are welcome! Refreshments will be served.
Speaker: | Dr. Jerimy Polf |
Department of Physics | |
Oklahoma State University | |
Date: | Monday, October 15, 2012 |
Time: | 3:30 PM |
Place: | PS 355 |
Topic: | Medical Physics |
Speaker: | Dr. Hooman Davoudiasl |
Department of Physics | |
Brookhaven National Laboratory | |
Date: | Thursday, October 18, 2012 |
Time: | 1:30 PM |
Place: | 106 B Studio Room, Classroom Building, OSU |
& Nielsen Hall, Room 103, OU | |
Title: | The Dark Side of the Higgs Diphoton Signal and the Muon g−2 |
Speaker: | Dr. Hooman Davoudiasl |
Department of Physics | |
Brookhaven National Laboratory | |
Date: | Thursday, October 18, 2012 |
Time: | 3:30 PM |
Place: | PS 101 |
Title: | The Standard Model: Necessary but Not Sufficient |
The Standard Model (SM) of particle physics has been very successful in describing a wide range of microscopic phenomena. The discovery of a new particle at the CERN Large Hadron Collider may have provided the last missing ingredient of the SM, namely the Higgs boson, needed to endow elementary particles with their masses. However, there are conceptual hints that suggest the SM may need to be embedded in a larger theoretical framework. There is also firm experimental evidence that a complete description of Nature requires new particles and interactions. One of the strongest such clues is the observational evidence for dark matter which outweighs the visible matter approximately 5 to 1 in the Universe. We will discuss some of the proposals for what dark matter may be and how to look for its signals. As we demonstrate in an example, new search strategies could be motivated in models that address the similarity between the dark and visible matter energy budgets.
Note: The traditional student-speaker chat will begin in Physical Sciences Room 147 at 3.00 PM. All students are welcome! Refreshments will be served.
Speaker: | Dr. James Wicksted |
Department of Physics | |
Oklahoma State University | |
Date: | Monday, October 22, 2012 |
Time: | 3:30 PM |
Place: | PS 355 |
Topic: | Optical Materials |
Speaker: | Dr. Kaladi S. Babu |
Department of Physics | |
Oklahoma State University | |
Date: | Thursday, October 25, 2012 |
Time: | 1:30 PM |
Place: | 106 B Studio Room, Classroom Building, OSU |
& Nielsen Hall, Room 103, OU | |
Title: | Top Quark Forward-Backward Asymmetry from Gauged Flavor Symmetry |
Speaker: | Dr. Alexander L. Gaeta |
School of Applied and Engineering Physics | |
Cornell University | |
Date: | Thursday, October 25, 2012 |
Time: | 3:30 PM |
Place: | PS 101 |
Title: | Temporal Magnification, Compression, and Cloaking of Light |
Recent research has shown that the properties of a light beam can be manipulated to perform ultrafast all-optical signal processing in the time domain. I will describe our recent work that uses nonlinear optics to create time lenses that can magnify, compress, and Fourier transform optical waveforms in the temporal domain. Through use of more exotic lenses, temporal gaps in light beams can be opened and closed which can be used to cloak events over short periods of time.
Note: The traditional student-speaker chat will begin in Physical Sciences Room 147 at 3.00 PM. All students are welcome! Refreshments will be served.
Speaker: | Dr. Mandy K. Rominsky |
Particle Physics Division | |
Fermi National Accelerator Lab, | |
Date: | Thursday, November 1, 2012 |
Time: | 1:30 PM |
Place: | 106 B Studio Room, Classroom Building, OSU |
& Nielsen Hall, Room 103, OU | |
Title: | Building Tracking Detectors for the New g−2 Experiment at Fermilab |
Speaker: | Dr. Steven M. Girvin |
Deputy Provost for Science and Technology & | |
Eugene Higgins Professor of Physics & Applied Physics | |
Department of Physics | |
Yale University | |
http://pantheon.yale.edu/~smg47 | |
Date: | Thursday, November 1, 2012 |
Time: | 3:30 PM |
Place: | PS 101 |
Title: | Quantum Money, Information and Computation |
New Mysteries from the Quantum World |
In the world of quantum mechanics, Heisenberg uncertainty is a key feature that for many years was thought of as a limitation or disadvantage. Physicists have recently come to realize that quantum uncertainty can in fact be a useful resource to encrypt information securely, create ‘quantum money’ that cannot be counterfeited, ‘teleport ’ quantum states from one place to another, and build quantum computers that can solve certain problems exponentially faster than classical computers. This talk will give an elementary introduction to these ideas and briefly describe current experimental attempts to construct the quantum bits that might someday form the building blocks of a practical quantum computer.
Note: This talk requires no prior knowledge of quantum mechanics and will be accessible to beginning students in any field.
Note: The traditional student-speaker chat will begin in Physical Sciences Room 147 at 3.00 PM. All students are welcome! Refreshments will be served.
Speaker: | Dr. Mario F. Borunda |
Department of Physics | |
Oklahoma State University | |
Date: | Friday, September 28, 2012 |
Time: | 2:00 PM |
Place: | PS 147 |
Title: | Controlling at the Nanoscale: |
Exploring the Quantum Behavior of Electrons Inside Quantum Wells |
I will present theory and calculations for coherent high-fidelity quantum control of many-particle states in semiconductor quantum wells. In this talk, I will show that coupling a two-electron double quantum dot to a terahertz optical source enables targeted excitations that are one to two orders of magnitude faster and significantly more accurate than those obtained with electric gates. The optical fields subject to physical constraints are obtained through quantum optimal control theory that is applied in conjunction with the numerically exact solution of the time-dependent Schrödinger equation. The ability to coherently control arbitrary two-electron states, and to maximize the entanglement, opens up further perspectives in solid-state quantum information.
Speaker: | Dr. Yolanda Vasquez |
Department of Chemistry | |
Oklahoma State University | |
Date: | Monday, November 5, 2012 |
Time: | 3:30 PM |
Place: | PS 355 |
Topic: | Three Short Stories in Nanomaterials: |
Synthesis, self-assembly, and bio-inspired applications |
Speaker: | Dr. Aristide Dogariu |
CREOL, The College of Optics & Photonics | |
University of Central Florida, Orlando, FL | |
Date: | Thursday, November 8, 2012 |
Time: | 3:30 PM |
Place: | PS 101 |
Title: | Spin Hall Effect of Light and Some Mechanical Consequences |
Electromagnetic waves carry angular momenta. The associated conservation laws for both propagation and scattering provide insights into phenomena such as spin transfer and power flow which, in turn, are essential for novel sensing approaches at nanoscales and for controlling the behavior of optical action at these scales.
Note: The traditional student-speaker chat will begin in Physical Sciences Room 147 at 3.00 PM. All students are welcome! Refreshments will be served.
Speaker: | Dr. Jacques H.H. Perk |
Department of Physics | |
Oklahoma State University | |
Date: | Monday, November 12, 2012 |
Time: | 3:30 PM |
Place: | PS 355 |
Topic: | Quasicrystals |
Speaker: | Dr. JoAnn L. Hewett |
Theoretical Physics Group | |
Particle Physics and Astrophysics | |
SLAC National Accelerator Laboratory | |
Date: | Thursday, November 15, 2012 |
Time: | 1:30 PM |
Place: | 106 B Studio Room, Classroom Building, OSU |
& Nielsen Hall, Room 103, OU | |
Title: | Higgs and SUSY Searches in the pMSSM |
Speaker: | Dr. JoAnn L. Hewett |
Theoretical Physics Group | |
Particle Physics and Astrophysics | |
SLAC National Accelerator Laboratory | |
Date: | Thursday, November 15, 2012 |
Time: | 3:30 PM |
Place: | PS 101 |
Title: | The LHC Confronts Supersymmetry |
The Large Hadron Collider is providing our first clear view of the Terascale and is confronting our most cherished theories with data, in particular Supersymmetry. Supersymmetry arises from a symmetry allowed by nature that is simply an extension of the Poincaré group. Supersymmetry at the Terascale offers attractive solutions to many outstanding issues, including the weak hierarchy problem, the dark matter problem and grand unification of the forces. Supersymmetry at the Terascale offers testable predictions that differ between models of Supersymmetry breaking. So far, LHC searches for Supersymmetric particles have come up short and the newly discovered Higgs-like boson is surprisingly difficult to accommodate within the simplest Supersymmetry breaking models. I will review the implications of this data on various Supersymmetric models.
Note: The traditional student-speaker chat will begin in Physical Sciences Room 147 at 3.00 PM. All students are welcome! Refreshments will be served.
Speaker: | Dr. Peter Shull |
Department of Physics | |
Oklahoma State University | |
Date: | Monday, November 19, 2012 |
Time: | 3:30 PM |
Place: | PS 355 |
Topic: | Astronomy at OSU |
Thanksgiving
Speakers: | Amanda Taylor and Sandip Kaledhonkar |
Department of Physics | |
Oklahoma State University | |
Date: | Thursday, November 29, 2012 |
Time: | 3:30 PM |
Place: | PS 101 |
Titles: | See below |
Note: The traditional student-speaker chat will begin in Physical Sciences Room 147 at 3.00 PM. All students are welcome! Refreshments will be served.
Speaker: | Amanda Taylor |
Title: | Chemical and Physical Changes of Bone by Solid-State NMR |
The structure and composition in bone determine its strength and resilience to loading. Changes in these factors are being studied in ovariectomized mice, which model induced bone loss. We have used solid-state NMR (SSNMR) to assess the collagen, water, and mineral contents of intact mouse bones. Pore sizes and spatial information about the mineral-collagen interface have also been elucidated from measurements. The ultimate goal of this research is to find what mechanisms are the most prevalent causes of increased fracture risk in bones.
Speaker: | Sandip Kaledhonkar |
Title: | The Role of “Electrostatic Epicenter” in Biological Signaling |
Living systems sense and respond to their ever changing environments through biological signal transduction. Malfunctions in cellular signaling cause serious diseases such as cancer. We study the activation mechanism of a prototype receptor protein, photoactive yellow protein (PYP), which detects blue light, converts it into a molecular message for signal relay, and ultimately informs the bacteria to swim away from blue light. Time-resolved Fourier-transform infrared (FTIR) spectroscopy is employed in this study. We will discuss the role of “electrostatic epicenter” in receptor activation not only for the PYP family, but also for medically important signaling proteins.
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