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Single hole motion in LaMnO3_3

Abstract

We study single hole motion in LaMnO3_3 using the classical approximation for JT lattice distortions, a modified Lang-Firsov approximation for dynamical breathing-mode phonons, and the self-consistent Born approximation (verified by exact diagonalization) for hole-orbital-excitation scattering. We show that in the realistic parameter space for LaMnO3_3, quantum effects of electron-phonon interaction are small. The quasiparticle bandwidth W2.2JW \simeq 2.2J in the purely orbital t-J model. It is strikingly broadened to be of order tt by strong static Jahn-Teller lattice distortions even when the polaronic band narrowing is taken into account.Comment: 4 pages, 4 eps figure

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