Bulletin of the American Physical Society
2005 APS March Meeting
Monday–Friday, March 21–25, 2005; Los Angeles, CA
Session H3: Prize Session |
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Sponsoring Units: APS Chair: Gordon Thomas, New Jersey Institute of Technology Room: LACC 515B |
Tuesday, March 22, 2005 8:00AM - 8:36AM |
H3.00001: Broida Prize Talk: Imaging Photodissociation Dynamics Invited Speaker: Advances in the technique of charged particle imaging (photofragments and photoelectrons) have enabled recent progress in understanding complex interactions involving electronically excited states of molecules, radicals, and transient species. In this talk, studies of the photodissociation dynamics of the NO dimer, a weakly covalently bound molecule, will be described in which imaging of photoions and photoelectrons is used to: (i) characterize the nature of the electronically excited states of the NO dimer; (ii) study and model the photofragmentation dynamics to NO fragments at the pair-correlation level; (iii) elucidate the role of nonadiabatic transitions, in particular interactions between Rydberg and valence states; (iv) determine the branching between channels in which one of the NO products is in an electronically excited state; and (v) clarify when the dimer behaves as a covalently bound ONNO molecule and when it exhibits properties similar to those of a van-der-Waals complex. With the aid of electronic structure calculations and time-resolved measurements, an intriguing picture of the dynamics emerges, in which interactions between valence and Rydberg states that vary during the dissociation play a crucial role. [Preview Abstract] |
Tuesday, March 22, 2005 8:36AM - 9:12AM |
H3.00002: George E. Pake Prize Lecture Invited Speaker: Over the past decade, a combination of the changes in the regulatory environment coupled with accelerating advances in technology caused the telecommunications industry to experience first an accelerated growth `boom' followed by a major `bust' - perhaps corresponding to the worst downturn in its history. Throughout this turbulent time, Bell Lab’s parent company, Lucent, has transformed itself from a vertically integrated \$38B telecomm systems company with 157k employees in 11 separate businesses into a horizontally layered, \$9B network infrastructure systems integrator with 32K employees and ~100 major customers. My talk will relate to how Bell Labs Research has weathered the `perfect storm', survived, and still maintains its focus on the future of telecommunications science and technology. [Preview Abstract] |
Tuesday, March 22, 2005 9:12AM - 9:48AM |
H3.00003: Onsager Prize Talk Invited Speaker: Many physical problems are associated with the quantum or statistical mechanics of strings and kinks. They include thermodynamics of adsorbed atoms on a crystal substrate, equilibrium shape of crystals, properties of vortices in a superconducting film with modulated thickness and Josephson vortices in layered superconductors, structure of intercalated compounds and others. Strings or domain wall in 2 dimensions can be treated as fermion world lines in 1+1 dimension. The fermion representation simplifies the problem and allows its exact solution. The fermion approach is especially useful for commensurate- incommensurate phase transition, which is described as the appearance of "living" fermions when the chemical potential exceeds the energy gap. It also allows finding the ground state of a quantum string in a periodic potential. At large enough ratio of quantum fluctuations to the strength of periodic potential its ground state becomes rough, with a multitude of kinks and antikinks. We review theoretical and experimental results in the field and discuss topological aspects of the problem. [Preview Abstract] |
Tuesday, March 22, 2005 9:48AM - 10:24AM |
H3.00004: Rahman Prize Talk: Small is Different: Materials in the Nanoscale Nonscalable Regime Invited Speaker: |
Tuesday, March 22, 2005 10:24AM - 11:00AM |
H3.00005: Heineman Prize Talk: Spin Glasses Between Mathematics and Physics Invited Speaker: The amount of work that has been done theoretical on spin glasses is quite large and I will concentrate on some of the main results. I will start from the physical explanation of the very slow response of many disordered systems (e.g. glasses and spin glasses). I will introduce a soluble model for spin glasses, the Sherrington-Kirkpatrick model, that generalizes the local Edwards- Anderson model in infinite dimensions. The model, where each spin is connected to all other spins, should be solved by using the appropriate mean field approximation. I will show how it can be heuristically solved using algebraic or probabilistic methods. I will briefly describe the recent rigorous mathematical proof that shows that this solution is correct. Finally I will describe the results and the problems that are present in extending the mean field theory to finite dimensions. [Preview Abstract] |
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