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ARPESAngle-Resolved Photoemission Spectroscopy
ARPESAngle-Resolved Photoelectron Spectroscopy
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Nevertheless, ARPES and Andreev reflection measurements suggest that the gap [[DELTA].sub.0] in the nodal direction is the gap associated with superconductivity [7].
The actual Fermi surface (or its relic in a non-Fermi-liquid) is given by the relative maxima of A(k, [omega] = 0), which takes into account, at the same time and on equal footing, both the real and the imaginary parts of the self-energy and is directly related, within the sudden approximation and forgetting any selection rules, to what ARPES effectively measures.
Reliable answer to this question can be obtained from experimental momentum distribution curves of highly resolved ARPES of single-wall nanotubes which are, however, un available so far.