ColloquiumSpeakersPage

Colloquium Speakers Spring 2007

Speaker Name (Reserved: Faculty Search)

Institution
Date of Colloquim	Jan 12
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Institution
Date of Colloquim	Jan 19
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Speaker Name (Reserved: Faculty Search)

Institution
Date of Colloquim	Jan 26
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Speaker Name (Reserved: Faculty Search)

Institution
Date of Colloquim	Feb 2
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James Wells

Institution	University of Michigan
Date of Colloquim	Feb 9
Colloquium Title	Large Hadron Collider implications of sharingthe burdens of mass generation
Abstract The Standard Model posits that a single scalar field gives rise to all elementary particle masses. The experimental implications of this assumption have been studied very carefully in the lead-up to the Large Hadron Collider (LHC), which is a high-energy proton-proton collider that turns on next year near Geneva, Switzerland. However, few people believe this (probably) naive worldview. More likely is that the burdens of mass generation are shared among several sectors of the underlying theory. I will describe a few simple scenarios for this and show how small augmentations of the theory can mean dramatic changes in experimental search strategies at the LHC for the particles and dynamics that give rise to mass.

Travel Information

Host	Keith Dienes
Dates of Visit	Feb. 5-9
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Citizenship	USA

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Gilad Perez

Institution
Date of Colloquim	Feb 16
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Host	Ina Sarcevic
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Stanley Pau

Institution	University of Arizon
Date of Colloquim
Colloquium Title	Feb. 23
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Hui Cao

Institution	Northwestern University
Date of Colloquim	March 2
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Host	Philippe Jacquod
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Alain Aspect

Institution	Ecole Polytechnique, Institute d'Optique
Date of Colloquim	March 9
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Host	Sean Fleming
Dates of Visit	March 8-10
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Hotel Information	Westward Look Resort
Citizenship	French

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Joint colloquium with Optics
Contact in Optics: Luz Palomarez, Email: lpalomarez@optics.arizona.edu
Lodging and transportation arranged by Luz Palomarez

Schedule:
9 am -- 9:30 am Brian Anderson
9:35 am -- 10:05 am Poul Jessen
10:10 am -- 10:40 am Stanley Pau
10:50 am -- 11:20 am Philippe Jacquod
11:25 am -- 11:55 am Alex Cronin
Noon -- 1pm Grad Student Lunch
1 pm -- 1:25 pm ???
1:30 pm -- 2 pm Pierre Mystre
2:05 pm -- 2:35 pm Mike Shupe
2:40 pm -- 3:10 ???
3:15 pm -- 3:45 ???

Herald Fritzsch

Institution	LM University Munich
Date of Colloquim	March 23
Colloquium Title	Fundamental Constants in Physics and Their Time Dependence
Abstract : There are at least 25 fundamental constants in physics, such as e.g. the fine structure constant. I discuss them, and the attempts to reduce the number of constants, in particular within the scheme of Grand Unification of all interactions. Recently a small time variation of the fine structure constant was reported. Considering grand unification I conclude that also the QCD scale must change. Pertinent experiments at the MPQ in Munich are being performed by Haensch and his group. Their results will be discussed and interpreted.

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Host	Jan Rafelski
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Citizenship	German

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Gabriella Sciolla

Institution	MIT
Date of Colloquim	March 30
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Host	Erich Varnes
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James Brooks

Institution	Selected short stories about electron lifestyles in organic metals at high magnetic fields.
Date of Colloquim	April 6
Colloquium Title
Abstract This talk will provide a brief survey of some of the most important, and sometimes dramatic, physical phenomena that occur in organic conductors and superconductors in the presence of high magnetic fields. Magnetic field induced superconductivity, quantum interferometry, magnetic field-induced phase transitions, and of course Lebed's magic angle effects, will be among the topics of this presentation.

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Host	Andrei Lebed
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Eric Lauga

Institution	MIT
Date of Colloquim	April 13
Colloquium Title	Some Fluid Mechanics Problems Inspired by Swimming Microorganisms
Abstract n this talk, we use biological locomotion on small scales as an inspiration (and an excuse) to solve a number of fluid mechanics problems. We first discuss the breakdown of the Purcell's scallop theorem with inertia and show that this can happen in a continuous fashion with the relevant Reynolds number. We then solve for the swimming kinematics of elastic swimmers, devices which exploit the flow-induced deformation of flexible filaments for propulsion. More generally, we show how soft surfaces can be exploited for propulsion without inertia. Finally, we describe how the viscoelastic nature of the surrounding fluid can affect the kinematics and energetics of simple swimmers.

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Host	John Kessler
Dates of Visit	Arrive Thursday April 12
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Arrive in Tucson with AA 1833 (from Chicago) at 9:09pm on thursday april 12

Berndt Muller

Institution	Duke University
Date of Colloquim	April 20
Colloquium Title	Why is Quark-Gluon Plasma a Perfect Liquid
Abstract

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Host	Jan Rafelski
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Abstract:

My lecture will describe what is now known from experiments about the
properties of strongly interacting matter at the highest accessible
energy densities. The important pieces of evidence include: large
collective flow, strong quenching of jets, and characteristic
differences in the emission features of mesons and baryons. The
matter produced in nuclear collisions thus reveals itself as a nearly
inviscid fluid ("perfect liquid") of extreme SU(3)-color opaqueness.
I will explain how these properties are related to each other and
discuss what they may imply for the internal structure of the matter
produced at RHIC. The lecture will conclude with a brief discussion
of the main open questions to be addressed in future experimental
and theoretical investigations.

???

Institution
Date of Colloquim	April 27
Colloquium Title
Abstract

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Dan Ralph

Institution	Cornell University
Date of Colloquim	May 4
Colloquium Title	Dynamics and Spectroscopy in Nanoscale Magnetic Devices
Abstract

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Host	Philippe Jacquod
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Abstract:

When a spin-polarized current interacts with a magnet, it can transfer spin angular
momentum to the magnet and thereby apply a torque. This spin-transfer effect can be used
to manipulate the magnetic-moment direction of small magnets much more efficiently than
using magnetic fields. I will describe experiments which utilize 100-nm-scale magnetic
devices to investigate the microscopic origin of this effect and the ways in which
individual nanomagnets can respond to the torque. I will discuss several different
dynamical regimes, including nanosecond-scale switching between static states,
steady-state precession driven by DC spin-polarized currents, and spin-transfer-driven
ferromagnetic resonance measurements of the magnetic normal modes in individual
nanomagnets.

In the last part of the talk, I will discuss progress toward extending experiments
on spin-dependent transport and dynamics to even smaller length scales. We have
developed a technique for using electromigration to form mechanically-stable nanoscale
magnetic electrodes for single-molecule studies. Even for simple bare contacts
(containing no molecules) made of permalloy or nickel, we find an unexpectedly large
anisotropic magnetoresistance when the junction resistances are greater than
approximately 1 k‡. We propose that this effect is the result of mesoscopic quantum
interference which depends on the orientation of the magnetization, leading to
fluctuations of conductance and the spin-dependent local density of states.

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Colloquium Speakers Fall 2007

Feryal Ozel

Institution	University of Arizona
Date of Colloquim	Aug. 31
Colloquium Title
Abstract

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Host	NA
Dates of Visit	NA
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Citizenship	NA

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Dr. Hakan Tureci

Institution	ETHZ Zurich
Date of Colloquim	Sept. 7
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Host	Philippe Jacquod
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Citizenship	Swiss

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Ian Shipsey

Institution	Purdue University
Date of Colloquim	Oct. 5
Colloquium Title	Cochlear Implants
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Host	Sean Fleming
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This talk needs to be cross listed with the med school etc. We'll need a big room.

Lincoln Carr

Institution	Colorado School of Mines
Date of Colloquim	Oct. 12
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Host	Pierre Mystre
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Margaret Murnane

Institution	JILA University of Colorado at Boulder
Date of Colloquim	TBA (September or November)
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Host	Pierre Mystre (?)
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UA ADVANCE Distinguished Lecturer

Anthony Thomas

Institution	Chief Scientist: Thomas Jefferson National Accelerator Facility and Governor's Distinguished CEBAF Professor: College of William and Mary
Date of Colloquim	Nov. 30
Colloquium Title	Overview of JLAB physics program and objective
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Host	Jan Rafelski
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