UConn Physics Colloquium

QUANTUM WELL STATES IN MAGNETIC NANOSTRUCTURES

Z. Q. Qiu
Department of Physics
University of California at Berkeley

Electrons in ultrathin films are confined to form quantum well states (QWS). Photoemission provides the most direct observation of QWS in k-space. The unique capabilities now available at the Advanced Light Source (ALS) at Berkeley make it possible to measure the QW states on the atomic scale. In this talk, the photoemission results from ALS on the Cu/Co(100) QW system are presented. Firstly, using a Ni monolayer to probe the Cu QWS at different positions, it is shown that the QWS in metallic thin films can be described by the envelope function of the Bloch wave. Secondly, by measuring the magnetic coupling by means of the magnetic linear dichroism, the relationship is demonstrated between the oscillatory magnetic coupling and the oscillations of the density of states at the Fermi level. Finally, quantum interference effect in double quantum well systems will be presented.

Friday, October 3, 2003
3:30 PM
Biology/Physics Building
Room BSP130

(Refreshments will be served immediately following the colloquium in the lobby outside the lecture hall)


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