Oklahoma State Physics Department
Seminars and Colloquia
August through December, 1995
(updated November 13, 1995)
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Seminars and Colloquia, Typical Week:
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Oklahoma High Energy Physics Seminar
on Talk-Back Television:
Date: Thursday
Time: 1:30 PM
Place: Classroom Building, Room 106
& Carson Hall, Room 438, OU
Inquiries: physmas@mvs.ucc.okstate.edu
shaown@vms.ucc.okstate.edu
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Physics Colloquium:
Date: Thursday
Time: 3:30 PM
Place: PS 110
Inquiries: jhhp@jperk.phy.okstate.edu
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Journal Club on Statistical Mechanics
and Condensed Matter Physics (Informal):
Date: Friday
Time: 1:30 PM (This semester)
Place: PS 147
Inquiries: jhhp@jperk.phy.okstate.edu
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Oklahoma State Physics Department
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Oklahoma State Physics Department
Seminars and Colloquia, Aug.14-18, 1995
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Special College of Arts and Sciences
Colloquium:
Speaker: Dr. Wayne Roberge
Department of Physics
Rensselaer Polytechnic Institute
Date: Tuesday, August 15, 1995
Time: 2:30-3:30 p.m.
Place: Noble Research Center, Rm 108
Title: Studio Classes:
Using Technology to Facilitate
Interactive Learning
Professor Roberge will discuss a new,
interactive learning method for an
introductory college course. The course he
and colleagues at Rensselaer have developed
combines traditional lectures, laboratories,
and problem-solving sessions into a single
learning environment called a studio. The
studio class intersperses brief mini-lectures
with mini-laboratories and other collaborative
exercises that are designed to reinforce
concepts as they are introduced. The use
of sophisticated computing tools for data
acquisition, analysis, and visualization
makes it possible for RPI instructors to
conduct these exercises daily. Dr. Roberge
will discuss his experience as the developer
of two studio courses at Rensselaer and
discuss how teaching in the studio mode
fits in with the other demands on a faculty
member's time.
Wayne Roberge is Associate Professor of
Physics at Rensselaer Polytechnic Institute
in Troy, New York. He received his B.A. in
Physics and Astronomy from Williams College
in 1976 and his Ph.D. in Astronomy from
Harvard University in 1981. Roberge is the
co-recipient of the 1995 Boeing Outstanding
Educator Award, a national award for
excellence in undergraduate education.
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Oklahoma State Physics Department
Seminars and Colloquia, Aug.21-Sep.1, 1995
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No activities: Orientation,
First Two Weeks of Classes
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Oklahoma State Physics Department Seminars
and Colloquia, September 4-8, 1995
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Oklahoma High Energy Physics Seminar
on Talk-Back Television:
Not Scheduled
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Physics Colloquium:
Speaker: Dr. Sheena Murphy
Department of Physics and Astronomy
The University of Oklahoma
Date: Thursday, September 7, 1995
Time: 3:30 PM
Place: PS 110
Title: Phase Transitions
in Quantum Hall Systems
Refreshments served before Colloquium in
Physical Sciences, Room 147, at 3:00 PM,
where also the traditional student-speaker
informal discussion is scheduled 2:45-3:15.
Abstract:
The development of high quality
two dimensional electron systems
(2DES) has led to the discovery
of such interesting phenomena
as universal conductance fluctuations,
quantized resistance in quantum point
contacts and the integer and fractional
quantum Hall effect (QHE).
In this talk I will describe experiments
conducted in double layer 2DES, where
the additional phase space presented
by tunneling between the layers and
the Coulomb repulsion of electrons
in different layers yields new QH states
unobservable in single layer systems.
Some of these new states undergo
a parallel magnetic field induced
phase transition and are predicted to
display superfluid, Kosterlitz-Thouless
and perhaps even Josephson behavior.
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Journal Club on Statistical Mechanics
and Condensed Matter Physics (Informal):
Speaker: Dr. Vic van Doren
Department of Physics,
University of Antwerpen
Date: Friday, September 8, 1995
Time: 2:30 PM (note later time!)
Place: NRC 108 (note change!)
Title: Some Theoretical Aspects
of Density Functional Theory
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Oklahoma State Physics Department Seminars
and Colloquia, September 11-15, 1995
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Oklahoma High Energy Physics Seminar
on Talk-Back Television:
Speaker: Dr. Sheldon Katz
Department of Mathematics, OSU
Date: Thursday, September 14, 1995
Time: 1:30 PM
Place: CLB 106 & Carson Hall 438
Title: Black Holes and Elementary
String States
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Physics Colloquium:
Speaker: Dr. Robert J. Hauenstein
Department of Physics, OSU
Date: Thursday, September 14, 1995
Time: 3:30 PM
Place: PS 110
Title: Molecular Beam Epitaxial Growth
and Characterization of
GaN/GaAs Heterostructures
Refreshments served before Colloquium in
Physical Sciences, Room 147, at 3:00 PM,
where also the traditional student-speaker
informal discussion is scheduled 2:45-3:15.
Abstract:
GaN is a refractory semiconductor whose
large, direct bandgap offers the
long-awaited technological prospect of
semiconductor devices which are capable of
optical emission at short wavelengths.
While conventional semiconductor
light-emitting-diode (LED) and laser-diode
(LD) device materials are limited to light
emission only in the range from IR
(invisible) through green (visible)
wavelengths, GaN-based epitaxial materials
promise to extend this range through the
entire visible spectrum and well into the
UV. Unfortunately, GaN single-crystal
epitaxial layers are difficult to grow on
conventional substrates due to their
unusually small lattice constant, yet a
fundamental understanding of growth under
such conditions is essential to the full
technological utilization of GaN-based
materials. In this talk, I will describe a
set of experiments which elucidate the
initial stages of molecular beam epitaxial
growth of GaN layers on GaAs substrates.
For the first time, fully commensurate
GaN/GaAs heterostructures have been grown,
and a study of these heterostructures,
through time-resolved reflection high
energy electron diffraction, and
high-resolution x-ray diffraction
techniques, has led to identification of
previously unreported microscopic growth
processes. Also, we have developed a
kinetic model through which a quantitative
description of these thermally activated
processes has been achieved. Finally, the
implications of our results to the general
growth of GaN/GaAs heterostructures will be
considered.
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Journal Club on Statistical Mechanics
and Condensed Matter Physics (Informal):
Speaker: Dr. Helen Au-Yang
Department of Physics, OSU
Date: Friday, September 15, 1995
Time: 1:30 PM
Place: PS 147
Title: Generalized Clock and
Chiral Clock Models
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Oklahoma State Physics Department Seminars
and Colloquia, September 18-22, 1995
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Oklahoma High Energy Physics Seminar
on Talk-Back Television:
Speaker: Dr. Mark A. Samuel
Department of Physics, OSU
Date: Thursday, September 21, 1995
Time: 1:30 PM
Place: CLB 106 & Carson Hall 438
Title: Going to Higher Order:
The Hard Way and the Easy Way
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Physics Colloquium:
Speaker: Dr. Albert T. Rosenberger
Department of Physics
Oklahoma State University
Date: Thursday, September 21, 1995
Time: 3:30 PM
Place: PS 110
Title: The Effect of Potential Range
on High-Field Suppression of
Photoionization
Refreshments served before Colloquium in
Physical Sciences, Room 147, at 3:00 PM,
where also the traditional student-speaker
informal discussion is scheduled 2:45-3:15.
Abstract:
Intense-field stabilization (IFS), or
suppression of photoionization, was
investigated by numerical solution of
classical equations of motion for
various three-dimensional potentials.
It was found that IFS exists only for
long-range potentials under very general
conditions. In this talk, I will describe
how this observation can be related to
the quantum-mechanical interpretation of
IFS in which Raman transitions via the
continuum form a coherent superposition
of a subset of the infinite set of
eigenstates provided by a long-range
potential.
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Journal Club on Statistical Mechanics
and Condensed Matter Physics (Informal):
Postponed
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Oklahoma State Physics Department Seminars
and Colloquia, September 25-29, 1995
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Oklahoma High Energy Physics Seminar
on Talk-Back Television:
Speaker: Dr. J. Kuehler
Department of Physics, OU
Date: Thursday, September 28, 1995
Time: 1:30 PM
Place: CLB 106 & Carson Hall 438
Title: Low p_T pi_0
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Physics Colloquium:
Speaker: Dr. Stephen W.S. McKeever
Head, Department of Physics
Oklahoma State University
Date: Thursday, September 28, 1995
Time: 3:30 PM
Place: PS 110
Title: Job Opportunities for
Graduate Students, and the
Role of the Physics Curriculum
Refreshments served before Colloquium in
Physical Sciences, Room 147, at 3:00 PM,
where also the traditional student-speaker
informal discussion is scheduled 2:45-3:15.
Abstract:
Last year, 1,450 Physics Ph.D. degrees
were awarded at US Universities. Of these,
it is estimated that 55% of the graduates
will be in temporary jobs (postdocs.) by
the following year, and some estimates show
that only 25-40% will find permanent jobs
in Physics. Of the 35,000 currently active
Physics Ph.Ds in the US, 10,000 are in
academic positions (permanent and
temporary). Where did the rest go? Where
will the balance of last year's 1,450
graduates go? Where will this year's
graduating class go? Is academia producing
too many Physics Ph.Ds?
This talk will examine some of the recent
statistics on job placement opportunities
for physics Ph.D. and M.S. graduates. At
a national level these data have led to
questions regarding the content of
"traditional" physics graduate programs
and have stimulated discussions regarding
the role of the physics curriculum in
educating and training students for the
late 20th-early 21st centuries. The talk
will share these data and discussions
with you.
STUDENTS:- IF THERE ARE NO OTHER COLLOQUIA
YOU GO TO THIS SEMESTER, MAKE SURE YOU GO
TO THIS ONE!
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Journal Club on Statistical Mechanics
and Condensed Matter Physics (Informal):
Speaker: Dr. Jacques H.H. Perk
Department of Physics, OSU
Date: Friday, September 29, 1995
Time: 1:30 PM
Place: PS 147
Title: Dogs, Fleas, and the
Second Law of Thermodynamics
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Oklahoma State Physics Department Seminars
and Colloquia, October 2-6, 1995
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Oklahoma High Energy Physics Seminar
on Talk-Back Television:
Speaker: Dr. Maarten Golterman
Department of Physics
Washington University
Date: Thursday, October 5, 1995
Time: 1:30 PM
Place: CLB 106 & Carson Hall 438
Title: Quenched QCD
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Physics Colloquium:
Speaker: Dr. M. S. Tomar
Department of Physics
The University of Tulsa
Date: Thursday, October 5, 1995
Time: 3:30 PM
Place: PS 110
Title: A Novel Route for Mixed
Metal-Oxide Thin Films
and Some Devices
Refreshments served before Colloquium in
Physical Sciences, Room 147, at 3:00 PM,
where also the traditional student-speaker
informal discussion is scheduled 3:00-3:15.
Abstract:
Mixed metal-oxide thin films play
an important role in optical, dielectric,
ferroelectric and high-Tc superconducting
devices, and rechargeable batteries. It
is known that high temperature involved
in the growth of oxide thin films limits
their use for Si and GaAs based memory
devices. Reliable low temperature and
less expensive growth processes are
desired for this purpose. We have
successfully developed a process to
achieve films of ternary titanates and
niobates suitable for ferroelectric
DRAM memory devices. I will discuss
the growth process, film properties,
and some barrier devices fabricated
on Si with these films. Some areas of
research effort will be discussed.
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Journal Club on Statistical Mechanics
and Condensed Matter Physics (Informal):
Postponed
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Oklahoma State Physics Department Seminars
and Colloquia, October 9-13, 1995
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Oklahoma High Energy Physics Seminar
on Talk-Back Television:
Speaker: Dr. G. Kalbfleisch
Department of Physics, OU
Date: Thursday, October 12, 1995
Time: 1:30 PM
Place: CLB 106 & Carson Hall 438
Title: Low-Mass Monopoles Revisited
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Physics Colloquium:
Speaker: Dr. Xincheng Xie
Department of Physics, OSU
Date: Thursday, October 12, 1995
Time: 3:30 PM
Place: PS 110
Title: Metal-Insulator Transition
of 2D Electron Gas
with Magnetic Field
Refreshments served before Colloquium in
Physical Sciences, Room 147, at 3:00 PM,
where also the traditional student-speaker
informal discussion is scheduled 3:00-3:15.
Abstract:
In this talk I'll give a brief review of
the theory of metal-insulator transition.
It is known that the electron wavefunction
is always localized in 1D and 2D,
regardless of the strength of disorder
if the Hamiltonian contains the
time-reversal symmetry. The presence
of the external magnetic field breaks
the time-reversal symmetry, therefore,
can induce the metal-insulator transition.
I'll present our recent results on
the metal-insulator transition of
2D electron system in the presence
of external magnetic field.
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Journal Club on Statistical Mechanics
and Condensed Matter Physics (Informal):
Speaker: Dr. Stephen D. Druger
Department of Physics
OSU and Northwestern Universtity
Date: Friday, October 13, 1995
Time: 1:30 PM
Place: PS 147
Title: Enhanced energy transfer between
molecules embedded in a spherical
dielectric droplet
Abstract:
Molecules embedded in a spherical dielectric
droplet can show [1] enhancements in
dipole-dipole energy transfer by factors
greater than 100 relative to the same
molecules in the corresponding bulk medium.
A theory [2] of the effect of morphological
resonances on dipole-dipole energy transfer
shows that coupling through the Mie
resonances of the spherical droplet should
indeed dominate the transfer, despite the
small fraction of the molecular spectra
that fall within the narrow Mie resonance
peaks. The theory explains many of the
observed features of the enhancement effect,
including the surprising lack of dependence
of transfer efficiency on acceptor
concentration. Very recent additional work
directly demonstrates the delocalized
character of the enhanced energy-transfer
effect, further confirming the explanation
in terms of Mie resonances, and verifying
that the more usual Foerster energy transfer
mechanism is negligible by comparison.
[1] L.M. Folan, S. Arnold, and S.D. Druger,
Chem. Phys. Lett. 118, 322 (1985).
[2] S.D. Druger, S. Arnold, and L.M. Folan,
J. Chem. Phys. 87, 2649 (1987).
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Oklahoma State Physics Department Seminars
and Colloquia, October 16-20, 1995
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Oklahoma High Energy Physics Seminar
on Talk-Back Television:
Speaker: Dr. Kim Milton
Department of Physics, OU
Date: Thursday, October 19, 1995
Time: 1:30 PM
Place: CLB 106 & Carson Hall 438
Title: Finite Element Method Applied
to Quantum Systems from
Quantum Mechanics to QCD
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String Theory & Algebraic Geometry Seminar:
Speaker: Dr. Philip Candelas
Department of Physics,
University of Texas at Austin
Date: Thursday, October 19, 1995
Time: 2:20 PM
Place: PS 453
Title: S-Duality and String Theory:
An Introduction for
Algebraic Geometers
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Physics Colloquium:
Speaker: Dr. Richard Rolleigh
Department of Physics
Hendrix College, Arkansas
Date: Thursday, October 19, 1995
Time: 3:30 PM
Place: PS 110
Title: A General Purpose Diffraction
Model for Ring Lasers
Refreshments served before Colloquium in
Physical Sciences, Room 147, at 3:00 PM,
where also the traditional student-speaker
informal discussion is scheduled 3:00-3:15.
Abstract:
Applying the slowly varying and average
envelope approximations to the wave
equation for the electric field reduces
it to an ordinary differential equation
that is first order in time and contains
a boundary term that can be identified
as the feedback field in a ring cavity.
The Huygens' integral, Fresnel
approximation, and use of ABCD matrices
will be reviewed and applied to the
calculation of the feedback field.
For azimuthally symmetric systems, the
diffraction integral can be reduced to
multiplication by a real matrix. Results
with a two level active medium pumped
by injection current will be presented.
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Journal Club on Statistical Mechanics
and Condensed Matter Physics (Informal):
Speaker: Dr. Penger Tong
Department of Physics, OSU
Date: Friday, October 20, 1995
Time: 1:30 PM
Place: PS 147
Title: Entropy Driven Phase Separation
in Binary Liquid Mixtures
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Oklahoma State Physics Department Seminars
and Colloquia, October 23-27, 1995
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Oklahoma High Energy Physics Seminar
on Talk-Back Television:
Speaker: Dr. Satya Nandi
Department of Physics, OSU
Date: Thursday, October 26, 1995
Time: 1:30 PM
Place: CLB 106 & Carson Hall 438
Title: Theory of Fermion Masses
and Mixings
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Physics Colloquium:
Speaker: Dr. Dongzi Liu
James Franck Institute
University of Chicago
Date: Thursday, October 26, 1995
Time: 4:00 PM
Place: PS 110
Title: Contemporary Understanding
of High T_c Superconductivity
Refreshments served before Colloquium in
Physical Sciences, Room 147, at 3:30 PM,
where also the traditional student-speaker
informal discussion is scheduled 3:30-3:45.
Abstract:
High T_c Superconductivity is one of
the most rapidly developing and most
challenging areas in Condensed Matter
Physics. In this talk, I will present
an overview of the current understanding
of high T_c material, especially in
the theoretical perspective. Among the
specific issues to be discussed are:
(1) Brief introduction on the basic
properties of superconductivity
and conventional BCS theory ons
superconductivity.
(2) Background on high T_c
superconductivity, structure
and electronic properties.
(3) Issues and current understanding
of high Tc material, including
outline of popular theories.
(4) Discussion on the symmetry of
superconducting gap, experimental
evidence and theory.
(5) Bi-layer effect and charge
channel mechanism.
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Journal Club on Statistical Mechanics
and Condensed Matter Physics (Informal):
Speaker: Dr. Dongzi Liu
James Franck Institute
University of Chicago
Date: Friday, October 27, 1995
Time: 1:30 PM
Place: PS 147
Title: Bi-layer Effect and
Charge Channel Superconductivity
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Oklahoma State Physics Department Seminars
and Colloquia, October 30-November 3, 1995
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Polymer Science and Engineering Seminars:
Speaker: Dr. Penger Tong
Department of Physics, OSU
Date: Tuesday, October 31, 1995
Time: 3:30 PM
Place: PS 147
Title: Depletion and Adsorption Phenomena
in Polymer Colloid Mixtures
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Oklahoma High Energy Physics Seminar
on Talk-Back Television:
Speaker: Dr. R. Kantowski
Department of Physics, OU
Time: CANCELLED
Title: Higher Dimensional Gravitational
Trace Anomalies
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Physics Colloquium:
Speaker: Dr. H. Larry Scott
Department of Physics, OSU
Date: Thursday, November 2, 1995
Time: 4:00 PM
Place: PS 110
Title: Molecular Dynamics Simulations
of a Fluid Phase Lipid Bilayer
Membrane
Refreshments served before Colloquium in
Physical Sciences, Room 147, at 3:30 PM,
where also the traditional student-speaker
informal discussion is scheduled 3:30-3:45.
Abstract:
Computer simulation offers the possibility
of new insights into complex systems. I
will describe a recent Molecular Dynamics
simulation of a hydrated lipid bilayer
carried out by myself and colleagues.
The bilayer consisted of two layers of
50 molecules each of the phospholipid
dimyristoylphosphatidylcholine (DMPC),
and 2100 water molecules. The MD run was
done under the constraint of constant
surface tension. The simulation began
with the bilayer in an ordered gel phase.
During the 400 picosecond trajectory
the system expanded into a fluid phase.
We calculated many properties of this
fluid membrane and found remarkably good
agreement with experiment. I will describe
the methodology and summarize the results
at a very general level in this talk.
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Journal Club on Statistical Mechanics
and Condensed Matter Physics (Informal):
Not scheduled, Polymer Seminar on Tuesday
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Oklahoma State Physics Department Seminars
and Colloquia, November 6-10, 1995
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Oklahoma High Energy Physics Seminar
on Talk-Back Television:
Speaker: Dr. Stan Brodsky
Head, Theory Group, SLAC
Date: Thursday, November 9, 1995
Time: 1:30 PM
Place: CLB 106 & Carson Hall 438
Title: Commensurate Scales
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Physics Colloquium:
Speaker: Dr. Stan Brodsky
Head, Theory Group, SLAC
Date: Thursday, November 9, 1995
Time: 4:00 PM
Place: PS 110
Title: Color Transparency and
Other Novel Effects
in Quantum Chromodynamics
Refreshments served before Colloquium in
Physical Sciences, Room 147, at 3:30 PM,
where also the traditional student-speaker
informal discussion is scheduled 3:30-3:45.
Abstract:
Quantum Chromodynamics, the theory of
quarks and gluons, provides a fundamental
description of the strong and nuclear
reactions. It also predicts novel
phenomena such as "hidden color,"
"color transparency," and "intrinsic
charm." An introduction to this exotic
QCD phenomenology and its experimental
tests will be presented.
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Journal Club on Statistical Mechanics
and Condensed Matter Physics (Informal):
Speaker: Dr. Bruce J. Ackerson
Department of Physics, OSU
Date: Friday, November 10, 1995
Time: 1:30 PM
Place: PS 147
Title: Entropy Driven Phase Separation
in Binary Liquid Mixtures, II
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Oklahoma State Physics Department Seminars
and Colloquia, November 13-17, 1995
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Oklahoma High Energy Physics Seminar
on Talk-Back Television:
Speaker: Dr. Caren Marzban
Department of Physics, OU
Date: Thursday, November 16, 1995
Time: 1:30 PM
Place: CLB 106 & Carson Hall 438
Title: The Statistical Mechanics
of Learning
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Physics Colloquium:
Not scheduled (See Friday).
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Informal Friday Physics Seminar:
Speaker: Dr. Anatoly Kachurin
Department of Biochemistry, OSU
Date: Friday, November 17, 1995
Time: 1:30 PM
Place: PS 147 (or PS 110)
Title: Some Nontypical Applications of
NMR to Biophysical Experiments
(the Study of Enzymes)
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Oklahoma State Physics Department Seminars
and Colloquia, November 20-24, 1995
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Polymer Science and Engineering Seminars:
Speaker: Dr. Alan Tree
School of Chemical Engineering
OSU
Date: Tuesday, November 21, 1995
Time: 3:30 PM
Place: PS 147
Title: Flow Induced Crystallization
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Oklahoma High Energy Physics Seminar
on Talk-Back Television:
Thanksgiving
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Physics Colloquium:
Thanksgiving
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Journal Club on Statistical Mechanics
and Condensed Matter Physics (Informal):
Not scheduled, Polymer Seminar on Tuesday
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Oklahoma State Physics Department Seminars
and Colloquia, November 27-December 1, 1995
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Friends of the Forms,
Fall 1995 Speaker Series:
Speaker: Dr. H. Larry Scott, Jr.
Department of Physics, OSU
Date: Wednesday, November 29, 1995
Time: 3:30 PM
Place: Case Study 2, Student Union
Title: Physics Teaching: What Methods,
If Any, Work and Why the Usual
Approach Fails
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Oklahoma High Energy Physics Seminar
on Talk-Back Television:
Speaker: Dr. Maya Paczuski
Brookhaven National Laboratory
Date: Thursday, November 30, 1995
Time: 1:30 PM
Place: CLB 106 & Carson Hall 438
Title: Avalanche Dynamics in Evolution,
Growth and Depinning Models
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Physics Colloquium:
Not scheduled.
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Journal Club on Statistical Mechanics
and Condensed Matter Physics (Informal):
Not scheduled. (Note Thursday talk)
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Oklahoma State Physics Department Seminars
and Colloquia, December 4-8, 1995
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Prefinals Week, No activities scheduled
except Special Laser Center Colloquium:
Speaker: Dr. Jean-Claude Diels
Department of Physics & Astronomy
The University of New Mexico
Date: Friday, December 8, 1995
Time: 2:30 PM
Place: 108 NRC
Title: Ultrashort laser pulse propagation
through air: self-filamentation,
laser triggered lightning, and
stool-top petawatt lasers
Abstract:
Ultrashort UV pulses can be effective
in triggering high voltage discharges.
An application of important economic
consequence is the possibility to trigger
and divert lightning. A complication that
arises is that the pulse peak power is
in excess of the critical power for
self-focussing. Is the light trapped
as a "bullet", or spread in a moving
focus, or both?
High peak powers require generally a
combination of laser amplifiers which
are a sink of space, water cooling and
dollars. A new type of compression
mechanism based on group velocity
mismatch in harmonic conversion source
is at the base of a compact source of
intense fs pulses, using a flashlamp
pumped Nd:YAG laser.
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Oklahoma State Physics Department Seminars
and Colloquia, December 11-15, 1995
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Finals Week, No activities scheduled
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Oklahoma State Physics Department Seminars
and Colloquia, December 18, 1995 - ...
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Christmas Break, Prelims
No activities scheduled
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