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Condensed Matter Seminars
| Condensed Matter
Thursday, March 4, 2004
Physics Building, Room 204
Note special time.
Note special room.
[Host: Olivier Pfister]
University of Maryland
"Spintronics: Fundamentals and Applications"
Spintronics is an interdisciplinary field in which the central idea
is the manipulation of spin degrees of freedom in solid state systems.
The motivation to examine spintronics ranges from fundamental
studies, where the changes of the spin degrees of freedom can be a
sensitive probe for basic physical phenomena, to applications that
are neither feasible nor effective with conventional electronics.
This talk will focus on two examples: (1) spin-polarized transport in
hybrid structures containing superconductors and (2) a proposal
for magnetic p-n junctions. Our prediction that a superconducting response
can be used to probe a novel class of ferromagnetic semiconductors has
recently led to the first direct measurement of the spin polarization
in these materials. In the second example, we develop a theory of
inhomogeneously doped semiconductors. We predict the spin-voltaic
effect, a spin-analogue of the photo-voltaic effect. We show that
the direction of the charge current (which can even flow at no applied
bias) can be switched by the reversal of an equilibrium magnetization
or of a polarization of the injected spin. The same spin-voltaic effect
can be used to develop a novel class of tunable magnetic transistors.
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