Purdue News Photo
|
Shown is an atomic force micrograph of a device used to separate quantum objects according to their spin, which could be used in next-generation computers and other "spintronic" devices. Using a so-called magnetic focusing technique, a small perpendicular magnetic field bends a beam of holes in a gallium arsenide semiconductor along two different cyclotron trajectories, the radius depending on the spin of the particles. Those holes with "up" spin curve in one direction, those with "down" spin in the other. The light-colored lines are oxide, which separate different regions of two-dimensional "hole gas" beneath the surface.
(Purdue University graphic)
The story accompanying this photograph can be seen by clicking this link to Rokhinson.spin
For more information about photographs, send e-mail to:
David Umberger
Associate Director
Purdue News Service
umberger@purdue.edu
Photo Index '03 Page.
To the News Service home page