Abstract
We demonstrate that the E vs k dispersion in the superconducting state
extracted from momentum-distribution curves differs qualitatively
from the traditional dispersion extracted from energy-distribution
curves. This occurs because of a combination of many-body effects
and the presence of an energy gap, along with the associated coherence
factors. Analysis of such momentum-distribution-curve dispersions
can give important information on the microscopics of high-temperature
superconductors.
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