Operator Projection Theory for Electron Differentiation in Underdoped Cuprate Superconductors

Abstract

Metals approaching the Mott insulator generate a new hierarchy in the electronic structure accompanied by a momentum dependent electron differentiation, beyond the Mott-Hubbard, Brinkman-Rice and Slater pictures of the Mott transition. To consider such nonlinear phenomenon, we develop an analytic nonperturbative theory based on operator projections combined with a self-consistent treatment of the low-energy excitations. This reproduces the formation of the Hubbard bands, Mott gap, spin fluctuations, mass divergence, diverging charge compressibility, and strongly renormalized flat and damped dispersion similar to angle-resolved photoemission data in high-T_c cuprates. Main structures in electronic spectra show a remarkable similarity to numerical results.

11 pages, presented at ``Spectroscopies of Novel Superconductors 2001''

Cited by in corpus (5)

• Quantum criticality around metal-insulator transitions of strongly correlated electrons
• Mott Transitions in the 2D Half-Filled Hubbard Model: Correlator Projection Method with Projective Dynamical Mean-Field Approximation
• Cofermion Theory for Pseudogap Phenomena and Superconducting Mechanism of Underdoped Cuprate Superconductors
• Variational Monte Carlo Study of Electron Differentiation around Mott Transition
• Quasiparticle states of the Hubbard model near the Fermi level