Session H21: Superconductivity: Electronic Structure of BSCCO; ARPES and theory
8:00 AM–11:00 AM, Tuesday, February 28, 2012
Room: 254A
Sponsoring Unit:
DCMP
Chair: Weiguo Yin, Brookhaven National Lab
Abstract ID: BAPS.2012.MAR.H21.15
Abstract: H21.00015 : Towards the Standard Model for Fermi Arcs from a Wilsonian Reduction of the Hubbard Model
10:48 AM–11:00 AM
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Abstract
Authors:
Seungmin Hong
(University of Illinois, Urbana-Champaign)
Philip Phillips
(University of Illinois, Urbana-Champaign)
Two remarkable features emerge from the exact Wilsonian procedure for integrating out the high-energy scale in the Hubbard model. At low energies, the number of excitations that couple minimally to the electromagnetic gauge is less than the conserved charge, thereby implying a breakdown of Fermi liquid theory. In addition, two charge $e$ excitations emerge in the lower band, the standard projected electron and a composite entity (comprised of a hole and a charge $2e$ bosonic field) which give rise to poles and zeros of the single-particle Green function, respectively. The poles generate spectral weight along an arc centered at $(\pi/2,\pi/2)$ while the zeros kill the spectral intensity on the back-side of the arc. The result is the Fermi arc structure intrinsic to cuprate phenomenology. The presence of composite excitations also produces a broad incoherent pseudogap feature at the $(\pi,0)$ region of the Brillouin zone, thereby providing a mechanism for the nodal/anti-nodal dichotomy seen in the cuprates.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2012.MAR.H21.15