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SUMMARY:Fermi surface topology and topological numbers in conductivity of 
 normal metals - Mal'tsev\, A (Landau Institute for Theoretical Physics\, M
 oscow)
DTSTART:20121121T113000Z
DTEND:20121121T123000Z
UID:TALK41595@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:We consider the geometry of the quasiclassical electron trajec
 tories on complicated Fermi surfaces in the presence of a strong magnetic 
 field. Using rigorous topological theorems we present the classification o
 f different topological types of open electron trajectories on the Fermi s
 urfaces and consider the corresponding conductivity regimes in the limit $
 B \nightarrow infty$. It is shown that the presence of the regular non-clo
 sed electron trajectories always leads to the presence of 'topological num
 bers' observable in the conductivity behaviour. On the other hand\, the ap
 pearance of unstable non-closed electron trajectories may lead to rather i
 nteresting behaviour of conductivity\, in particular\, to the freezing of 
 the longitudinal conductivity in the limit $B \nightarrow infty$. The full
  picture of different regimes of magneto-conductivity behaviour can be con
 sidered as an important characteristic of the dispersion relation in metal
 s.\n\n(Joint work with S.P. Novikov).\n
LOCATION:Seminar Room 1\, Newton Institute
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