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SUMMARY:Visualizing Complex Electronic Quantum Matter - Professor J C Seam
 us Davis\, Cornell University
DTSTART:20060308T161500Z
DTEND:20060308T171500Z
UID:TALK4690@talks.cam.ac.uk
CONTACT:Duncan Simpson
DESCRIPTION:I will describe the development of low temperature Wavefunctio
 n Imaging STM techniques for transition metal oxides. They allow us to vis
 ualize the Complex Electronic Quantum Matter in such systems\, directly at
  the Atomic Scale. \nAs an example\, we will visually explore the strange 
 and beautiful nanoscale electronic structure of High-Tc Superconductivity.
  This amazing phenomenon emerges when localized electrons of a CuO2 antife
 rromagnetic Mott-insulator become itinerant due to carrier-doping. Atomic 
 scale visualization of both this process and its consequences for high-Tc 
 superconductivity\, are new frontiers in the study of this 20 year old mys
 tery. \nOne of the most startling discoveries was the intense Superconduct
 ing Pair Energy Disorder [1] at nanoscale. Another was strong scattering a
 nd quantum-mixing of delocalized states producing beautiful Quantum Interf
 erence Patterns [2]. Yet another was spontaneous electronic reorganization
  into Nanoscale Checkerboard States inside vortex cores [3] and at very lo
 w doping [4]. Individual impurity atom mapping techniques [5] are now reve
 aling how individual dopant atoms [6] generate these unprecedented forms o
 f nanoscale electronic disorder. Finally\, I will describe our new techniq
 ue for visualizing Atomic Scale Electron-Lattice Interactions [7] and its 
 consequences for identification of the mechanism of high-Tc superconductiv
 ity.\n\n[1] Nature 413 282 (2001)\;  Nature 415 412 (2002).\n[2] Science 2
 97 1148 (2002)\; Nature 422 592 (2003).\n[3] Science 266 455 (2002).\n[4] 
 Nature 430 1001 (2004) \n[5] Nature 403 746 (2000)\; Nature 411 920 (2001)
 .\n[6] Science 309 1048 (2005).\n[7] Jinho Lee et al\, Submitted to Nature
 .\n\n
LOCATION:Pippard Lecture Theatre\, Cavendish Laboratory
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