Excitons in insulating cuprates

Details Excitons in insulating cuprates Excitons in insulating cuprates

1996-01-22

arxiv.org/abs/cond-mat/9601094v1

Physics

Condensed Matter

10 pages and 3 figures in postscript format, compressed with uufiles

Scientific paper

10.1103/PhysRevB.54.R3780

We study the electronic excitations near the charge-transfer gap in insulating CuO$_2$ planes, starting from a six-band model which includes $% p_\pi $ and $d_{xy}$ orbitals and Cu-O nearest-neighbor repulsion $U_{pd}$. While the low lying electronic excitations in the doped system are well described by a modified $t-J$ model, the excitonic states of the insulator include hybrid $d_{xy}-$ $p_\pi $ states of $A_{2g}$ symmetry. We also obtain excitons of symmetries $B_{1g}$ and $E_u$, and eventually $A_{1g}$, which can be explained within a one-band model. The results agree with observed optical absorption and Raman excitations.

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