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SUMMARY:Can the thermal conductivity of semiconductors be controlled by im
 purities? - Stefan K. Estreicher\, Physics Department\, Texas Tech Univers
 ity
DTSTART:20090605T143000Z
DTEND:20090605T153000Z
UID:TALK18300@talks.cam.ac.uk
CONTACT:Dr Jonathan Keeling
DESCRIPTION:It is well known that the mechanical\, electrical\, optical\, 
 and even magnetic properties of semiconductors and semiconductor nanostruc
 tures can be controlled almost at will by the use of carefully selected im
 purities. Can the thermal properties of these materials be controlled as w
 ell?\nIn this talk\, I will discuss a first-principles approach to the cal
 culation of thermal conductivities in periodic supercells containing impur
 ities. The early results indicate that\, under specific conditions\, the t
 hermal conductivity of the material can be reduced by more than a factor o
 f 30. Even though the theoretical and experimental issues are tricky\, fur
 ther studies of this problem might prove rewarding.\n
LOCATION:TCM Seminar Room\, Cavendish Laboratory
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