Superconductivity from Undressing. II. Single Particle Green's Function and Photoemission in Cuprates

Abstract

Experimental evidence indicates that the superconducting transition in high $T_c$ cuprates is an 'undressing' transition. Microscopic mechanisms giving rise to this physics were discussed in the first paper of this series. Here we discuss the calculation of the single particle Green's function and spectral function for Hamiltonians describing undressing transitions in the normal and superconducting states. A single parameter, ${\rm Y}$, describes the strength of the undressing process and drives the transition to superconductivity. In the normal state, the spectral function evolves from predominantly incoherent to partly coherent as the hole concentration increases. In the superconducting state, the 'normal' Green's function acquires a contribution from the anomalous Green's function when ${\rm Y}$ is non-zero; the resulting contribution to the spectral function is $positive$ for hole extraction and $negative$ for hole injection. It is proposed that these results explain the observation of sharp quasiparticle states in the superconducting state of cuprates along the $(\pi ,0)$ direction and their absence along the $(\pi ,\pi )$ direction.

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References in corpus (8)

• Imaging the Effects of Individual Zinc Impurity Atoms on Superconductivity in Bi2Sr2CaCu2O8+delta
• Electronic Spectra and Their Relation to the (pi,pi) Collective Mode in High-Tc Superconductors
• Signature of Superfluid Density in the Single-Particle Excitation Spectrum of Bi2Sr2CaCu2O8+delta
• Superconductivity from Undressing
• Spin-Charge Separation is the Key to the High T_c Cuprates
• Interlayer Conductivity in the Superconductor Tl-Ba-Cu-O: Energetics and Energy Scales
• Where is 99% of the condensation energy of Tl_2Ba_2CuO_y coming from?
• C-axis optical properties of high Tc cuprates

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