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SUMMARY:3/2 Fermi liquid: Theory of small fermi pockets in underdoped cupr
 ates - G Baskaran\, The Institute of Mathematical Sciences\, Chennai\, Ind
 ia
DTSTART:20101008T140000Z
DTEND:20101008T150000Z
UID:TALK27232@talks.cam.ac.uk
CONTACT:Dr G Moller
DESCRIPTION:Electrical and magnetic properties of underdoped cuprates in t
 he spin gap phase\, a precursor to high Tc superconducting state\, is ridd
 led with puzzles. We propose a novel reference state to study this phase\,
  where each hole dopant adds one real holon and one real spinon\, with Hal
 dane exclusion statistics g_h =1 and g_s = 1/2\, to a fairly inert (pseudo
  gaped) spin liquid vacuum\, resulting in a low density spin-charge liquid
 . Spins and charges interact and form a novel collective state\, a 3/2-Fer
 mi liquid. A holon pairs with a spinon\; this hole like fermion composite 
 carries charge +e and a spin-\\hlf moment and novel exclusion statistics g
 _{hole} = 3/2. We explain an anomalous expansion of Fermi sea area by 3/2\
 , seen in recent quantum oscillation experiments at two different dopings.
LOCATION:Mott Seminar Room\, Cavendish Laboratory
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