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SUMMARY:Electron Waves Unveil the Microcosmos - A. Tonomura\, Hitachi ARL/
 RIKEN/OIST
DTSTART:20091216T143000Z
DTEND:20091216T153000Z
UID:TALK21850@talks.cam.ac.uk
CONTACT:Dr Christopher John Edgcombe
DESCRIPTION:Bright beams such as lasers and synchrotron radiation play a d
 ecisive role in opening up new windows for investigating microscopic struc
 tures of materials. We have repeatedly developed brighter electron beams s
 ince 1968 to utilize the phase information in an electron beam. As it turn
 ed out\, every time we developed a brighter electron beam\, the precision 
 in the phase measurements increased thus opening up new applications. It h
 as become possible to carry out fundamental experiments in quantum mechani
 cs that were once regarded as “thought experiments”. Such experiments 
 include single-electron build-up of an interference pattern and conclusive
  experiments on the Aharonov-Bohm effect. Also\, visualizing magnetic line
 s of force in h/e flux units by interference microscopy and dynamically vi
 sualizing quantized vortices in superconductors by Lorentz microscopy has 
 become possible. In spring 2000\, we completed a 1-MV microscope that has 
 the brightest beam ever obtained\, and we have begun obtaining various new
  results on the vortex behaviors inside high-Tc superconductors\, such as 
 the observations of vortices trapped along tilted columnar defects in Bi-2
 212 film  and elucidations of the mechanism for forming a special arrangem
 ent of vortices\, the chain-lattice state\, that reflects the layered stru
 cture of the material.\n\n
LOCATION:Small Lecture Theatre\, Cavendish Laboratory\, Department of Phys
 ics
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