Abstract
Photoelectron spectroscopy can probe low energy electronic excitations in solids, with practical limitations set by the experimental energy and angular resolution. Appropriate conditions can now be achieved which allow us to visualize changes in the electronic states near the Fermi surface at phase transitions, namely in two-dimensional materials. Quasi one-dimensional conductors are unique in their apparent failure to exhibit a clear metallic signature. This unusual spectroscopic behavior might be the consequence of the singular nature of electronic correlations in 1D.
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