Temperature-dependent Luttinger surfaces.
The Luttinger surface of an organic metal (TTF-TCNQ), possessing charge order and spin-charge separated band dispersions, 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.
Ito
T
T
The Institute of Physical and Chemical Research (RIKEN), Sayo-gun, Hyogo 679-5143, Japan. tito@ims.ac.jp
Chainani
A
A
Haruna
T
T
Kanai
K
K
Yokoya
T
T
Shin
S
S
Kato
R
R