Measuring the gap in ARPES experiments

Details Measuring the gap in ARPES experiments Measuring the gap in ARPES experiments

2002-08-21

arxiv.org/abs/cond-mat/0208418v1

Phys. Rev. B 67, 064504 (2003)

Physics

Condensed Matter

Superconductivity

revtex4, 9 pages, 6 figures

Scientific paper

10.1103/PhysRevB.67.064504

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.

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