Bulletin of the American Physical Society
APS March Meeting 2012
Volume 57, Number 1
Monday–Friday, February 27–March 2 2012; Boston, Massachusetts
Session H3: Invited Session: Electronic Properties of the Pseudogap Phase in Cuprates
8:00 AM–11:00 AM,
Tuesday, February 28, 2012
Sponsoring Unit: DCMP
Chair: Fu-Chun Zhang, University of Hong Kong
Abstract ID: BAPS.2012.MAR.H3.4
Abstract: H3.00004 : Fermi pockets and the pseudogap in underdoped $Bi_2Sr_2CaCu_2O_8$*
9:48 AM–10:24 AM
Preview Abstract Abstract
(Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory)
The Fermi surface topologies of underdoped samples of the high $T_c$ superconductor $Bi_2Sr_2CaCu_2O_8$ have been measured with angle resolved photoemission. By examining thermally excited states above the Fermi level, we show that the observed Fermi surfaces in the pseudogap phase are actually components of enclosed hole-pockets. The spectral weight of these pockets is vanishingly small at the magnetic zone boundary, creating the illusion of Fermi ``arc''. The area of the pockets as measured in this study is consistent with the doping level, and hence carrier density, of the samples measured. Furthermore, the shape and area of the pockets is well reproduced by phenomenological models of the pseudogap phase as a spin liquid. The demonstration that the pseudogap in the anti-nodal region is a gap symmetric about the chemical potential is a clear indication that singlet pairing takes place in the normal state.
*The work at Brookhaven is supported in part by the U.S. DOE under Contract No. DE-AC02- 98CH10886 and in part by the Center for Emergent Superconductivity (CES), an Energy Frontier Research Center funded by the U.S. DOE, Office of Basic Energy Sciences.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2012.MAR.H3.4
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