Measuring the gap in ARPES experiments

Abstract

Angle-resolved photoemission spectroscopy (ARPES) is considered as the only experimental tool from which the momentum distribution of both the superconducting and pseudo-gap can be quantitatively derived. The binding energy of the leading edge of the photoemission spectrum, usually called the leading edge gap (LEG), is the model-independent quantity which can be measured in the modern ARPES experiments with the very high accuracy--better than 1 meV. This, however, may be useless as long as the relation between the LEG and the real gap is unknown. We present a systematic study of the LEG as a function of a number of physical and experimental parameters. The absolute gap values which have been derived from the numerical simulation prove, for example that the nodal direction in the underdoped Bi-2212 in superconducting state is really the node--the gap is zero. The other consequences of the simulations are discussed.

revtex4, 9 pages, 6 figures

Cited by in corpus (7)

• Bare electron dispersion from photoemission experiments
• Self-consistent self-energy analysis of photoemission data
• Resonant magnetic excitations at high energy in superconducting $\mathbf{YB}{\mathbf{a}}_2\mathbf{C}{\mathbf{u}}_3{\mathbf{O}}_{6.85}$
• Manifestation of the magnetic resonance mode in the nodal quasiparticle lifetime in superconducting cuprates
• Evidence for CuO conducting band splitting in the nodal direction of Bi-2212
• Circular dichroism and bilayer splitting in the normal state of underdoped (Pb,Bi)${}_2$Sr${}_2$(Ca${}_x$Y${}_{1-x}$)Cu${}_2$O${}_{8+\delta }$ and overdoped (Pb,Bi)${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$
• Life of the nodal quasiparticles in Bi-2212 as seen by ARPES