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APS » Journals » Phys. Rev. B » Volume 54 » Issue 6
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Phys. Rev. B 54, R3780–R3783 (1996)

Excitons in insulating cuprates

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M. E. Simón, A. A. Aligia, C. D. Batista, E. R. Gagliano, and F. Lema
Centro Atómico Bariloche and Instituto Balseiro, Comisión Nacional de Energía Atómica, 8400 S.C. de Bariloche, Argentina

Received 17 April 1996; published in the issue dated 1 August 1996

We study the electronic excitations near the charge-transfer gap in insulating CuO2 planes, starting from a six-band model which includes pπ and dxy orbitals and Cu-O nearest-neighbor repulsion Upd. 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 dxy-pπ states of A2g symmetry. We also obtain excitons of symmetries B1g and Eu, and eventually A1g, which can be explained within a one-band model. The results agree with observed optical absorption and Raman excitations.

© 1996 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.54.R3780
DOI:
10.1103/PhysRevB.54.R3780
PACS:
 
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