Electronic Structure of Mott Insulators Studied by Inelastic X-ray Scattering

Details Electronic Structure of Mott Insulators Studied by Inelastic X-ray Scattering Electronic Structure of Mott Insulators Studied by Inelastic X-ray Scattering

2001-02-27

arxiv.org/abs/cond-mat/0102489v2

Science 288, 1811 (2000)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 4 figures, Revised

Scientific paper

10.1126/science.288.5472.1811

The electronic structure of Mott insulators continues to be a major unsolved problem in physics despite more than half-century of intense research efforts. Well-developed momentum-resolved spectroscopies such as photoemission or neutron scattering cannot probe the full Mott gap. We report observation of dispersive charge excitations across the Mott gap in a high Tc parent cuprate Ca2CuO2Cl2 using high resolution resonant inelastic x-ray scattering shedding light on the anisotropy of Mott-gap. The results provide direct support for the Hubbard model to describe charge excitations across the Mott gap.

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