Quantum versus Classical Polarons in a Ferromagnetic CuO_3-Like Chain

• Authors: K. Bieniasz , A. Oleś
• Languages of publication: EN

Abstracts

EN

We present an exact solution for an itinerant hole added into the oxygen orbitals of a CuO_{3}-like ferromagnetic chain. Using the Green function method, the quantum polarons obtained for the Heisenberg SU(2) interaction between localized Cu spins are compared with the polarons in the Ising chain. We find that magnons with large energy are favorable towards quasiparticle existence, even in the case of relatively modest electron-magnon coupling. We observe two quasiparticle states with dispersion ~2t each, which emerge from the incoherent continuum when the exchange coupling J increases. Quantum fluctuations in the spin system modify the incoherent part of the spectrum and change the spectral function qualitatively, beyond the bands derived from the perturbation theory.

Keywords

EN

72.10.Di; 75.10.Pq; 75.50.Dd; 79.60.-i

Discipline

• 75.10.Pq: Spin chain models
• 79.60.-i: Photoemission and photoelectron spectra(for photoelectron spectroscopy, see 87.64.ks in biological physics; 82.80.Pv in chemical analysis)
• 75.50.Dd: Nonmetallic ferromagnetic materials
• 72.10.Di: Scattering by phonons, magnons, and other nonlocalized excitations(see also 71.45.-d Collective effects in electronic structure of bulk materials)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2014
• Volume: 126
• Issue: 4a
• Pages: A-80-A-84

Dates

published

2014-10

Contributors

author

K. Bieniasz

• M. Smoluchowski Institute of Physics, Jagiellonian University, W.S. Reymonta 4, 30-059 Kraków, Poland

author

A. Oleś

• M. Smoluchowski Institute of Physics, Jagiellonian University, W.S. Reymonta 4, 30-059 Kraków, Poland
• Max-Planck-Institut für Festkörperforschung, Heisenbergstr. 1, D-70569 Stuttgart, Germany

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Identifiers

DOI

10.12693/APhysPolA.126.A-80