The case for the bulk nature of the spectroscopic Luttinger liquid signatures observed in angle resolved photoemission of Li0.9Mo6O17

Abstract

Angle resolved photoemission spectroscopy (ARPES) has been performed on quasi-one dimensional Li0.9Mo6O17 using photon energy 500 eV. Measured band dispersions are in agreement with those from both low photon energy measurements and band structure calculations. The momentum integrated ARPES spectrum is well fit by the finite temperature Luttinger liquid (LL)spectral function, with an anomalous exponent 0.6 that is the same within experimental uncertainty as the value found with photon energy 30 eV. These identical findings at both low and high photon energies are entirely consistent with reasoning based on the crystal structure, that the quasi-one dimensional chains lie two layers below the cleavage plane so that the observed spectroscopic LL behavior of Li0.9Mo6O17 is a bulk property.

arXiv commentAccepted for publication in Physical Review B

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• Photoemission Spectroscopy and the Unusually Robust One Dimensional Physics of Lithium Purple Bronze
• Some experimental tests of Tomonaga-Luttinger liquids
• Local density of states of the one-dimensional spinless fermion model
• Multi-orbital physics in lithium-molybdenum purple-bronze: going beyond paradigm
• Light scattering in inhomogeneous Tomonaga-Luttinger liquids
• Band-selective Holstein polaron in Luttinger liquid material A0.3MoO3 (A = K, Rb)