Recent high resolution photoemission studies of electronic structure in quasi-one-dimensional conductors

Abstract The electronic structure near the Fermi level of K 0.3 MoO 3 and Li 0.9 Mo 6 O 17 , two prototypical quasi-one-dimensional (1D) conductors, has been studied using very high resolution angle-resolved photoemission spectroscopy. Our results differ from earlier lower resolution studies. For Li 0.9 Mo 6 O 17 we clearly observe a quasi-1D state dispersing through the Fermi level ( E F ) and the opening up of a gap at E F as the sample is cooled through a bulk metal to non-metal transition at 24 K. For K 0.3 MoO 3 we clearly observe two quasi-1D bands cross E F , and measured a temperature dependence to the Fermi surface nesting vector that correlates well with neutron-scattering measurements of the charge density wave vector.