Electronic Structure of Mott Insulators Studied by Inelastic X-ray Scattering
M. Z. Hasan,
1*
E. D. Isaacs,
2
Z.-X. Shen,
1
L. L. Miller,
3
K. Tsutsui,
4
T. Tohyama,
4
S. Maekawa
4
The electronic structure of Mott insulators continues to
be a major unsolved problem in physics despite more than 50 years of
research. Well-developed momentum-resolved spectroscopies such as
photoemission or neutron scattering cannot probe the full Mott gap.
High-resolution resonant inelastic x-ray scattering revealed dispersive
charge excitations across the Mott gap in a high-critical temperature parent cuprate
(Ca2CuO2Cl2), shedding light on the anisotropy of the Mott gap. These charge excitations across the Mott
gap can be described within the framework of the Hubbard model.
1 Department of Applied Physics, Stanford
Synchrotron Radiation Laboratory (SSRL), and Stanford Linear
Accelerator Center (SLAC), Stanford University, Stanford, CA 94305, USA.
2 Bell Laboratories, Lucent Technologies,
Murray Hill, NJ 07974, USA.
3 Department of Physics
and Ames Laboratory, Iowa State University, Ames, IA 50011, USA.
4 Institute of Materials Research, Tohoku
University, Sendai 980-8577, Japan.
*
To whom correspondence should be addressed. E-mail:
mzhasan{at}stanford.edu
