Colloquium speaker, Farida Selim (Bowling Green State University) today at 4:00pm

[Patterson, Robin L.]

Please join us for the Physics Colloquium today, at 4:00 PM in The Robert Smith Seminar Room. There will be a reception in the Atrium at 3:45PM. Details concerning the talk are as follows:

Speaker:         Farida Selim (Bowling Green State University)
Date:               Tuesday, January 10, 2017
Time:              4:00 PM
Place:             1080 Physics Research Building, The Robert Smith Seminar Room
Title:                Origin of Novel Physical Phenomena in Complex Oxides Probed by Positron Annihilation



Abstract:   Complex oxides exhibit many fascinating physical phenomena that make them perfect candidates for fundamental and applied research. Their electronic and photonic properties strongly depend on their native defects.  We can fully characterize such defects in terms of their level in the band gap and their type and structure by combining stimulated luminescence techniques with positron annihilation spectroscopy (PAS). Positron annihilation is unique probe to identify atomic size defects with 10-7 sensitivity.  In this talk I will discuss the basics of PAS and its significant role in advancing semiconductors and electronic and photonic materials research. Then I will share some of our interesting results on applying PAS to understand the optical and transport properties of a few multi-functional complex oxides such SrTiO3 (STO).  The focus will be on our recent discovery: of 1) Unusual luminescence phenomena in STO and 2) large persistent photoconductivity in its bulk with negligible decay, and the role of PAS in revealing their origins.  Lastly I will discuss the implications on our understanding of some novel phenomena such as the formation of 2-dimensional electron gas (2DEG) and Metal to Semiconductor Transition at the interface of STO based heterostructures.



The website for the colloquium is https://physics.osu.edu/physics-colloquium-schedule.




Robin
[The Ohio State University]
Robin Patterson
Program Coordinator
Department of Physics
1040K Physics Research Building, 191 W. Woodruff Avenue, Columbus, OH 43210
(614) 292-8523 Office     (614) 292-7557 Fax
patterson.716 at osu.edu<mailto:patterson.716 at osu.edu> osu.edu<http://osu.edu/>

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