Volume 91, Number 4, August 2010
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||15 September 2010|
Interplay between charge-lattice interaction and strong electron correlations in cuprates: Phonon anomaly and spectral kinks
SPIN-CNR and Dipartimento di Scienze Fisiche, Università di Napoli Federico II - I-80126 Napoli, Italy, EU
2 SPIN-CNR and Dipartimento di Fisica “E. R. Caianiello”, Università di Salerno - I-84100 Salerno, Italy, EU
3 Cross-Correlated Materials Research Group (CMRG), ASI, RIKEN - Wako 351-0198, Japan
4 RRC “Kurchatov Institute” - 123182 Moscow, Russia
5 Department of Applied Physics, The University of Tokyo - 7-3-1 Hongo, Bunkyo-ku, Tokyo 113, Japan
Accepted: 13 August 2010
We investigate the interplay between strong electron correlations and charge-lattice interaction in cuprates. The coupling between half-breathing bond-stretching phonons and doped holes in the t-t′-J model is studied by the limited phonon basis exact diagonalization method. Nonadiabatic electron-phonon interaction leads to the splitting of the phonon spectral function at half-way to the zone boundary at and to low-energy kink feature in the electron dispersion, in agreement with experimental observations. Another kink due to strong electron correlation effects is observed at higher energy, depending on the strength of the charge-lattice coupling.
PACS: 71.10.Fd – Lattice fermion models (Hubbard model, etc.) / 63.20.kk – Phonon interactions with other quasiparticles / 63.20.-e – Phonons in crystal lattices
© EPLA, 2010
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.