Multiband one-dimensional electronic structure and spectroscopic   signature of Tomonoga-Luttinger liquid behavior in K$_2$Cr$_3$As$_3$
  We present Angle-Resolved Photoemission Spectroscopy measurements of the quasi-one dimensional superconductor K$_2$Cr$_3$As$_3$. We find that the Fermi surface contains two Fermi surface sheets, with linearly dispersing bands not displaying any significant band renormalizations. The one-dimensional band dispersions display a suppression of spectral intensity approaching the Fermi level according to a linear power law, over an energy range of ~200 meV. This is interpreted as a signature of Tomonoga-Luttinger liquid physics, which provides a new perspective on the possibly unconventional superconductivity in this family of compounds. 
M. D. Watson, Y. Feng, C. W. Nicholson, C. Monney, J. M. Riley, H.   Iwasawa, K. Refson, V. Sacksteder, D. T. Adroja, J. Zha...
cond-mat.supr-con cond-mat.str-el