Volume 95, Number 5, September 2011
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||24 August 2011|
Polaronic metal in lightly doped high-Tc cuprates
Cross-Correlated Materials Research Group (CMRG), ASI, RIKEN - Wako 351-0198, Japan
2 RRC “Kurchatov Institute” - 123182, Moscow, Russia
3 Department of Applied Physics, The University of Tokyo - 7-3-1 Hongo, Bunkyo-ku, Tokyo 113, Japan
4 Laboratory of Atomic and Solid State Physics, Department of Physics, Cornell University - Ithaca, NY 14853, USA
5 Department of Physics, Applied Physics, and Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory - Menlo Park, CA 94025, USA
6 Stanford University - Stanford, CA 94305, USA
7 National Lab for Superconductivity, Institute of Physics, Chinese Academy of Sciences - Beijing 100190, China
Accepted: 20 July 2011
We present a combined study of the angle-resolved-photoemission spectroscopy (ARPES) and quantum Monte Carlo simulations to propose a novel polaronic metallic state in underdoped cuprates. An approximation scheme is proposed to represent underdoped cuprates away from 1/2 filling, replacing the many-body Hamiltonian by that of a single polaron with effective electron-phonon interaction (EPI), that successfully explains many puzzles such as a large momentum-dependent dichotomy between nodal and antinodal directions, and an unconventional doping dependence of ARPES in the underdoped region.
PACS: 71.10.Fd – Lattice fermion models (Hubbard model, etc.) / 71.38.-k – Polarons and electron-phonon interactions / 02.70.Ss – Quantum Monte Carlo methods
© EPLA, 2011
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