EECS500 Spring 2017 Department Colloquium

Oana Malis
Quantum Band Engineering in Ill-Nitride Semiconductors
Purdue University
White 411
11:30 AM - 12:30 PM
February 9, 2017

Quantum confinement in the conduction band of semiconductor heterostructures brings about fascinating optical properties in the infrared range of the spectrum due to intersubband transitions. Intersubband transitions refer to optical transitions between energy levels derived completely from a single conduction or valence band of the host material rather than optical transitions across the fundamental band-gap. Research on intersubband transitions in recent years has resulted in fundamental discoveries that eventually triggered practical device applications. In this talk I will focus on our efforts 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 work to understand, model, and control the fundamental underpinnings of light absorption and electrical transport in nitride nanostructures. Special attention will be given to the relationship between growth, structure, and optical properties in lattice-matched and nonpolar nitride heterostructures. 


Prof. Malis received a M.S. Degree in Physics from the University of Bucharest, Romania, and a Ph.D. in Physics from Boston University. After a Post-Doctoral position at Cornell University, Dr. Malis took a position in industry at IQE, Inc., Bethlehem, PA, to perform research on dilute nitrides for telecommunication lasers.  In 2003 Dr. Malis joined the Quantum Cascade Laser research group at Bell Labs, Lucent Technologies.  After leaving Bell Labs in 2006, Dr.  Malis continued her research on novel materials for infrared lasers and detectors first as an Assistant Professor in the Physics Dept. at the State University of New York at Binghamton, and then as an Assistant and currently as an Associate Professor in the Physics Dept. at Purdue University. She is the recipient of a Career Award from the National Science Foundation and a Cottrell College Science Award from the Research Foundation for Science Advancement.