The University of Utah
Department of Physics & Astronomy at the University of Utah

Science Night Live with Anil Seth

Wednesday, Dec. 5 @ 5:30 p.m. - Science Night Live! with Anil Seth! "Spying on Our Neighbors With the Hubble Space Telescope" at Keys on Main(242 South Main Street, Salt Lake City, UT)!.

SCIENCE NIGHT LIVE

with Dr. Anil Seth,
Assistant Professor of Physics & Astronomy

Spying on Our Neighbors With the Hubble Space Telescope

Date & Time: Wednesday, Dec. 5, 2012. 5:30 - 7:00 PM

Location: Keys on Main (242 South Main Street, Salt Lake City, UT)
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Galaxies are collections of billions of stars with a wide variety of shapes, colors and sizes. Astronomers still don't fully understand how this diverse zoo of galaxies form. In the galaxies nearest to our own Milky Way, we can learn about their histories by studying individual stars and clusters of stars. The Andromeda galaxy is our nearest galactic neighbor: beautiful, intriguing, and full of secrets.

The Hubble Space Telescope is currently engaged in a 4-year campaign to image Andromeda and reveal some of these secrets. U of U Professor of Physics and Astronomy Anil Seth will show some of the amazing pictures from this survey and discuss what we can learn from them.

Frontiers of Science is free and open to the public. Must be 21 or older to attend.

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Kipp van Schooten Thesis Defense 12/05/12

Thesis Defense

Kipp van Schooten

Wednesday, December 5, 2012
3:30pm (110 INSCC)

Title: Optically Active Charge Traps & Chemical Defects in Semiconducting Nanocrystals Probed by Pulsed Optically Detected Magnetic Resonance

Abstract:

The forefront of current nanoscience initiatives includes the investigation and development of semiconducting colloidal nanocrystals for optoelectronic device concepts. Being highly facile in their synthesis, a wide range of sizes, morphologies, materials, interactions and effects can easily be engineered. Their solution-processability also offers the prospect of extremely cheap device manufacturing. Additionally, this material class makes available a type of “playground” for generating and observing novel quantum effects within reduced dimensions.

Since the surface-to-volume ratio is very large in these systems, unsatisfied surface states are able to dominate the energetics of these particles. Serving as charge “trap” states, their effect on observables is readily seen, for instance, in single particle photoluminescence blinking. Unfortunately, most methods used to observe their influence are inherently blind to the chemical identity of these sites. In absence of such structural information, systematically engineering a robust passivation system becomes problematic.

The development of pulsed optically detected magnetic resonance (pODMR) as a method for directly addressing the chemical nature of optically active charges while under trapping conditions is the primary tenet of this thesis work. Several trapping channels are observed in CdS nanorods, while two in particular are correlated, demonstrating for the first time that both electrons and holes are able to be trapped within the same nanoparticle at the same time. The intrinsically long spin coherence lifetime for these states allows for the spin multiplicity and degree of isolation to be explored, and opens the possibility of highly precise chemical fingerprinting through electron spin echo envelop modulation (ESEEM). Demonstration of novel effects is also performed for CdS/CdSe heterostructure tetrapods, such as coherent control of the light-harvesting process and remote readout of spin information.

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This Week's Colloquium: Robert Davis, Dec. 6, 2012

Robert Davis
Brigham Young University

Thursday, Dec. 6, 2012
102 JFB

Refreshments: 3:30 pm in 219 JFB
Lecture 4:00pm (102 JFB)

Title: Carbon Nanotube Templated Microfabrication

Abstract:

Precision microscale manufacturing, driven initially by the microelectronics industry, has more recently been extended to fabricate structures for mechanical and optical applications. Very low cost microscale mechanical sensors have become ubiquitous; most smart phones now incorporate microfabricated accelerometers and gyros. Silicon is not only the anchor material for microelectronics but vertically etching of silicon is also used to create the three dimensional microstructures used in applications ranging from inertial sensors to neural probe arrays. We have recently developed carbon nanotube templated microfabrication (CNT-M), a fabrication technique that is complementary in several ways to vertical silicon etching. CNT-M enables high aspect ratio fabrication of microstructures from a wide range of materials including ceramics and metals. We now use CNT-M to fabricate structures for applications ranging from energy storage to chemical filtration and detection.

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Frontiers of Science with Pearl Sandick

Wednesday, Nov. 28 @ 7:30 p.m. - Frontiers of Science with Pearl Sandick! "Particle Smashers, Higgs Hunters, & the Fundamental Theory of the Universe" at the ASB on the U of U Campus!.

FRONTIERS OF SCIENCE

with Dr. Pearl Sandick,
Assistant Professor of Physics & Astronomy

Particle Smashers, Higgs Hunters, & the Fundamental Theory of Nature

Date & Time:Wednesday, Nov. 28, 2012. 7:30 - 8:30 PM

Location: 220 Aline Skaggs Building at the University of Utah
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On July 4th, 2012, a Higgs-like particle was discovered by the Large Hadron Collider. This discovery is a major step towards the goal of understanding the origin of mass, with implications for the fundamental theory of physics that describes our universe.

In this lecture, Dr. Pearl Sandick tells the story of the Higgs boson, the researchers searching for it, and what it means for the future of particle physics.

Frontiers of Science is free and open to the public. Please arrive early, as seating and parking will be limited.

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