"Polaronic metal in lightly doped high-Tc cuprates"

A. S. Mishchenko: N. Nagaosa, K. M. Shen, Z.-X. Shen, X. J. Zhou and T. P. Devereaux; EPL, 08/24/11.

Additional Authors: N. Nagaosa, K. M. Shen, Z.-X. Shen, X. J. Zhou and T. P. Devereaux

Abstract:

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.