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PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-1689
DTSTART:20100408T150000Z
DURATION:PT1H0M0S
DTSTAMP:20260422T145302Z
LAST-MODIFIED:20100405T124712Z
LOCATION:5310 Chamberlin
SUMMARY:Spin electronics for materials spectroscopy\, R. G. Herb Conde
 nsed Matter Seminar\, Christoph Boehme\, University of Utah
DESCRIPTION:In semiconductors with weak spin-orbit coupling\, spin-sel
 ection rules allow electron spins and nuclear spins to influence elect
 rical and optical material properties. Such spin-dependent processes e
 nable a number of applications ranging from readout of spin quantum co
 mputers and spin-electronic devices to semiconductor spin spectroscopy
 . The latter is of great importance for understanding the role that sp
 ins play for efficiencies of solar cells\, light emitting diodes and o
 ther electronic devices. In this talk I will discuss our recent progre
 ss on the development of a spin-selection rule based coherent spin spe
 ctroscopy and I will summarize our research-activities and -results us
 ing this technique. I will then discuss in detail an experiment demons
 trating the control of the electric current in organic light emitting 
 diodes by spin-beat oscillations of Coulomb-coupled charge carriers pa
 irs. The beat oscillations are due to a difference of the local magnet
 ic hyperfine fields caused by a bath of hydrogen nuclear spins in the 
 vicinity of the charge carrier pairs. The observation of this effect p
 rovides insights into how nuclear spins in organic semiconductors infl
 uence conductivity and electroluminescence.
URL:https://www.physics.wisc.edu/events/?id=1689
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