The angle resolved photoemission spectroscopy lineshapes of quasi one-dimensional (1d) Li0.9Mo6O17 display both agreement with and departures from the one-band Tomonaga-Luttinger model. We show that the departures can be understood by explicitly accounting for the four modes arising from the two quasi-1d bands known to cross the Fermi energy. The key assumption is that the antisymmetric charge mode is gapped with a magnitude near the temperature (T) of a mysterious 25K powerlaw resistivity upturn. The gap is consistent with the lack of a charge or spin density wave accompanying the upturn, is able to control the upturn T, and prevents crossover to a Fermi liquid (FL) down to the superconducting transition at 1.9K.
@article{arxiv.1610.02842,
title = {Gapped electron fractionalization in robustly one dimensional Li0.9Mo6O17},
author = {Natalia Lera and J. V. Alvarez and J. W. Allen},
journal= {arXiv preprint arXiv:1610.02842},
year = {2016}
}