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SUMMARY:Lifshitz topological transition in interacting Fermi systems - Bet
 ouras\, J (Loughborough University)
DTSTART:20130916T134500Z
DTEND:20130916T141500Z
UID:TALK47136@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:Co-authors: Sam T. Carr (Karsruhe Institute of Technology)\, J
 orge Quintanilla (University of Kent)\, Sergey Slizovskiy (Loughborough Un
 iversity)\, Ziyang Meng (Louisiana State University)\, Kuanshing Chen (Lou
 isiana State University)\, Mark Jarrell (Louisiana State University)\, Jua
 na Moreno (Louisiana State University)\n\nRecently\, the theory of topolog
 ical Lifshitz transition has become the focus of much attention in complex
  materials such as high-Tc superconductors\, heavy fermions compounds etc.
  In this talk\, we present three cases of topological Lifshitz transitions
  involving: (i) A Fermi liquid in two and three dimensions\, interacting w
 ith short range interactions and exhibiting first order Lifshitz transitio
 n due to these interactions. The transition becomes more pronounced in the
  regime of paramagnons. The motivation for this work is provided by recent
  experiments on the material NaxCoO2.\n\n(ii) The Hubbard model with negat
 ive next nearest neighbor hoping that shows to exhibit Lifshitz transition
  and a "multimode" quantum criticality associated with it and\n\n(iii) Dip
 olar fermions in optical lattices where we consider an experimentally real
 izable two dimensional model of non-interacting chains of spinless fermion
 s weakly coupled via a small inter-chain hopping and a repulsive inter-cha
 in interaction. The phase diagram of this model has a surprising feature: 
 an abrupt change in the Fermi surface as the interaction is increased.\n\n
 The work at Loughborough has been supported by the Engineering and Physica
 l Science Council.\n
LOCATION:Seminar Room 1\, Newton Institute
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