Daixiang Mou, R. M. Konik, A. M. Tsvelik, I. Zalyznyak, Xingjiang Zhou
We present and analyze high resolution angle resolved photoemission (ARPES) data for K$_{0.3}$MoO$_3$ (blue bronze). The observed Fermi surface, with two sheets that are one dimensional in nature, is consistent with a ladder material with only weak inter-ladder coupling. The marked broadening of the ARPES lineshape, a significant fraction of an eV, can be interpreted in terms of the intra-ladder interaction between the bonding and antibonding bands of the ladder that leads to spin-charge separation. The interaction also gives rise to asymmetry in the dispersions seen to the left and the right of a given Fermi point. With improved energy resolution, a high energy feature is revealed for the first time in the photoemission spectra near the Fermi momentum. We believe this new feature is indicative of a higher energy bound state of soliton excitations on a ladder.
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http://arxiv.org/abs/1207.7066
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