Department Colloquia

The dynamics of E. coli ultra-structure

Speaker: 
Paul Wiggins (University of Washington)
Event Date and Time: 
Thu, 2012-03-01 16:00 - 17:00
Location: 
Hennings 201
Local Contact: 
Carl Hansen
Intended Audience: 
Undergraduate
Almost all biological systems exhibit precise spatial and temporal control of protein, mRNA, and DNA localization, demonstrating that cells measure distance and detect proximity with a molecular-scale tool kit. Although these phenomena have traditionally been studied in the context of the detailed expression patterning in development, recent exciting results reveal that intricate spatial organization is the rule rather than the exception in the bacterial cell.

Neutron Star Masses and Basic Physics Consequences

Speaker: 
Scott Ransom (National Radio Astronomy Observatory (USA))
Event Date and Time: 
Thu, 2012-02-16 16:00 - 17:00
Location: 
Hennings 201
Local Contact: 
Ingrid Stairs
Intended Audience: 
Undergraduate
Over the past several years, astrophysical observations of neutron stars using X-rays and radio wavelengths have made significant progress towards determining the Equation of State of neutron star matter. The discovery of several interesting new pulsars as well as improved instrumentation has finally allowed us to start measuring the masses of millisecond pulsars.

Nanostructured Sensors for Ultrasensitive Biomolecular Analysis

Speaker: 
Shana Kelley
Event Date and Time: 
Thu, 2012-02-09 16:00 - 17:00
Location: 
Hennings 201
Local Contact: 
Carl Hansen
Intended Audience: 
Undergraduate
The analysis of panels of molecular biomarkers offers valuable diagnostic and prognostic information for clinical decision making. Robust, practical platforms that detect low levels of biomolecules (< 1000 copies) are urgently needed to advance medical care by diagnosing and predicting the progression of cancer and other disease states. Electrochemical methods providing low cost and direct biomarker read-out have attracted a great deal of attention for this application, but have, to date, failed to provide clinically-relevant sensitivity.

Maxwell, Einstein, and Their Impossibilities

Speaker: 
Mark Raizen (University of Texas, Austin)
Event Date and Time: 
Thu, 2012-02-02 16:00 - 17:00
Location: 
Hennings 201
Local Contact: 
Kirk Madison
Intended Audience: 
Undergraduate
In 1871, James Clerk Maxwell proposed a thought experiment, and in 1907, Albert Einstein made a prediction. Both men concluded that the experimental realizations would be impossible. In this talk I will describe our recent work that relates to this history, and show how it has enabled new methods for controlling matter with light.

Transport dynamics of ultracold atoms in a double-well potential

Speaker: 
Joseph Thywissen (University of Toronto)
Event Date and Time: 
Thu, 2012-01-26 16:00 - 17:00
Location: 
Hennings 201
Local Contact: 
Kirk Madison
Intended Audience: 
Undergraduate
Ultracold atoms are ideal systems in which to study many-body quantum dynamics: these neutral gases are held in completely conservative potentials and isolated from dissipative interaction with the environment. In this talk, I present our observations of population dynamics of a Bose-Einstein condensate in a double-well potential. Oscillatory dynamics span three octaves, as we tune the healing length from 0.3d to 2d, where d is the separation between the wells.

Quantum optics and quantum information processing with superconducting circuits

Speaker: 
Alexandre Blais (Universite de Sherbrooke)
Event Date and Time: 
Thu, 2012-01-19 16:00 - 17:00
Location: 
Hennings 201
Local Contact: 
Robert Raussendorf
Intended Audience: 
Undergraduate
Coupling of superconducting qubits to quantized microwave fields stored in electrical circuits has opened new possibilities for quantum optics and quantum information processing in solid-state devices. With the steady improvements of the coherence time of superconducting qubits and with the large qubit-field coupling that can be achieved, these on-chip realizations of cavity QED, also known as circuit QED, can reach new parameter regimes currently unexplored in atomic based quantum optics.

Ultraplanckian scattering, black holes, and the problems of quantum gravity

Speaker: 
Steve Giddings (UC Santa Barbara)
Event Date and Time: 
Thu, 2012-01-12 16:00 - 17:00
Location: 
Hennings 201
Local Contact: 
Gordon Semenoff
Intended Audience: 
Undergraduate
Reconciling quantum mechanics with gravity is perhaps the most conceptually profound unsolved problem from twentieth century physics. Gedanken experiments have a long tradition in unravelling difficult problems. One such experiment exposing a central issue in quantum gravity is that of scattering particles at energies above the Planck scale. Such collisions might even be realized at LHC, in certain theories of nature. In a classical description of this scattering, black holes form; Hawking showed quantum effects then cause their evaporation.

From Topological Insulators to Majorana Fermions

Speaker: 
Charles Kane (Penn State)
Event Date and Time: 
Thu, 2011-11-17 16:00
Location: 
Hennings 201
A topological insulator is a material that is an insulator on its interior,but has special conducting states on its surface. These surface states are unlike any other known two dimensional conductor. They are characterized by a unique Dirac type dispersion relation and are protected by a topological property of the material's underlying electronic band structure. Topological insulators have attracted considerable interest as a fundamentally new electronic phase with applications from spintronics to quantum computing.

Using graphene to study superconductivity (new tricks for an old dog)

Speaker: 
Nadya Mason (University of Illinois at Urbana Champaign)
Event Date and Time: 
Thu, 2011-12-01 16:00 - 17:00
Location: 
Hennings 201
Local Contact: 
Marcel Franz
Intended Audience: 
Undergraduate
Superconductors are materials that can have zero electrical resistance. They are thus of great interest for applications such as power transmission and energy storage. While the fundamental physics of standard superconductors has now been understood for over 50 years, questions remain about what happens when superconductors are coupled to other materials. For example, it was known that superconducting carriers could be transmitted through a normal metal, but the spectroscopy of the individual modes had not been measured.
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