Christoph Boehme University of Utah

1
Christoph BoehmeUniversity of Utah
Poster 23
Ultrasensitive spin measurement techniques
Broad interest categories Nanoscopic systems
for which magnetic resonance is important
Christoph Boehme University of Utah October 5,
2006
Ultrasensitive spin measurement techniques
2
Research interests
Why measuring spins?
Magnetic resonance techniques have revolutionized
chemistry (NMR, ESR) but also medical diagnostics
(MRI)
Why is sensitivity of MR insufficient?
Magnetic resonance fails for small systems due to
its volume sensitivity. It can not be applied to
nanoscopic systems containing small spin
ensembles (single molecules, quantum dots, single
electron transitors etc.).
What to do?
Investigate spin to charge or spin to photon
conversion mechanisms.
Christoph Boehme University of Utah October 5,
2006
Ultrasensitive spin measurement techniques
3
Example for electrical spin measurement Readout
devices for single P nuclear spin in Si
o o o o o o o o o o o o o o
31P atoms
Andre R. Stegner, Christoph Boehme, Hans Huebl,
Martin Stutzmann, Klaus Lips, and Martin S.
Brandt, arXivquant-ph/0607178 v1 25 Jul 2006
Christoph Boehme University of Utah October 5,
2006
Ultrasensitive spin measurement techniques
4
Optical magnetic resonance imaging with
enzymatically specific fluorescent beacons
Single photon detection of infrared photons
Photon emission is spin-dependent
? The goal of this work Development of new MRI
technique with very high spatial resolution AND
very high sensitivity
C. Boehme, K. Lips, M. Hoheisel, patent
application 10 2005 017 817.0, Deutsches
Patentamt, Verfahren und Vorrichtung zur
Untersuchung eines biologischen Gewebes.
Christoph Boehme University of Utah October 5,
2006
Ultrasensitive spin measurement techniques