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Graduation Commencement

Condensed Matter Seminar Abstract

Date: Oct 25    (217A Conference Room Shap Lab at 2:00pm)

Speaker: Nitin Samarth, Pensylvannia State University

Title: Spin Control in Magnetic Semiconductor Heterostructures

Abstract:

Magnetic semiconductor heterostructures provide an interesting playground for probing and manipulating spin interactions between extended electronic states and localized magnetic moments [1]. We provide an overview of recent experiments wherein we use a variety of techniques to engineer spin interactions in heterostructures derived from magnetic semiconductors such as (Ga,Mn)As and (Zn,Mn)Se.
Specific examples include:

• the use of submicron lithography to tailor the Curie temperature of (Ga,Mn)As heterostructure devices by altering defect diffusion pathways [2];
• the exchange biasing of (Ga,Mn)As epilayers via antiferromagnetic overlayers [3]
• the opto-electronic tuning of coherent electron spin precession at near-THz frequencies in magnetic semiconductor quantum wells.