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"Quantum band engineering with new materials for infrared light emission"

Oana Malis
Purdue University


Quantum confinement in the conduction band of semiconductor heterostructures brings about fascinating optical properties in the infrared range of the spectrum. Research on intersubband transitions in recent years has resulted in fundamental discoveries that eventually triggered practical device applications. Our goal is to creatively exploit the unique properties of nano-structured III-nitride materials for novel light emitters and detectors in the currently under-developed near- and far-infrared ranges. Due to large electron effective mass, the nitride intersubband materials require the ability to fine-tune the atomic structure at an unprecedented sub-nanometer level. I will describe our efforts to understand, model, and control the effects of the nanostructure on optical properties and vertical transport in nitride heterostructures to realize the theoretical potential of this material system. Special attention will be given to the relationship between growth, structure, and optical properties in lattice-matched AlInN/GaN heterostructures. We also report the first observation of exactly reproducible low-temperature negative differential resistance in c-plane resonant tunneling diodes on low-defect quasi-bulk GaN substrates.

Friday, November 16, 2012
IQSE 578, 4:00 p.m.
Mitchell Physics Building

Department of Physics and Astronomy
Texas A&M University

(Coffee and Cookies to be served 3:45 p.m.)

Host: Alexei Sokolov and Dr. Wenhao Wu