Momentum-Resolved Charge Excitations in a Prototype One Dimensional Mott Insulator

Details Momentum-Resolved Charge Excitations in a Prototype One Dimensional Mott Insulator Momentum-Resolved Charge Excitations in a Prototype One Dimensional Mott Insulator

2001-02-27

arxiv.org/abs/cond-mat/0102485v3

Phys. Rev. Lett. 88, 177403 (2002)

Physics

Condensed Matter

Strongly Correlated Electrons

3 pages, 2 figures, Revised with minor changes

Scientific paper

10.1103/PhysRevLett.88.177403

We report momentum resolved charge excitations in a one dimensional (1-D) Mott insulator studied using high resolution (~ 325 meV) inelastic x-ray scattering over the entire Brillouin zone for the first time. Excitations at the insulating gap edge are found to be highly dispersive (momentum dependent)compared to excitations observed in two dimensional Mott insulators. The observed dispersion in 1-D is consistent with charge excitations involving holons which is unique to spin-1/2 quantum chain systems. These results point to the potential utility of inelastic x-ray scattering in providing valuable information about electronic structure of strongly correlated insulators.

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