The Luttinger surface of an organic metal (TTF-TCNQ), possessing charge order and spin-charge separation, is investigated using temperature dependent angle-resolved photoemission spectroscopy. The Luttinger surface topology, obtained from momentum distribution curves, changes from quasi-2D(dimensional) to quasi-1D with temperature. The high temperature quasi-2D surface exhibits 4kF charge-density-wave (CDW) superstructure in the TCNQ derived holon band, in the absence of 2kF order. Decreasing temperature results in quasi-1D nested 2kF CDW order in the TCNQ spinon band and in the TTF surface. The results establish the link in momentum-space between charge order and spin-charge separation in a Luttinger liquid.
@article{arxiv.cond-mat/0507326,
title = {Temperature dependent Luttinger surfaces},
author = {T. Ito and A. Chainani and T. Haruna and K. Kanai and T. Yokoya and S. Shin and R. Kato},
journal= {arXiv preprint arXiv:cond-mat/0507326},
year = {2009}
}