Quasiparticles in the Kondo lattice model at partial fillings of the conduction band using the density matrix renormalization group

Smerat, Sebastian, Schollwock, Ulrich, McCulloch, Ian P. and Schoeller, Herbert (2009) Quasiparticles in the Kondo lattice model at partial fillings of the conduction band using the density matrix renormalization group. Physical Review B, 79 23: 23107-1-23107-9. doi:10.1103/PhysRevB.79.235107

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Author Smerat, Sebastian
Schollwock, Ulrich
McCulloch, Ian P.
Schoeller, Herbert
Title Quasiparticles in the Kondo lattice model at partial fillings of the conduction band using the density matrix renormalization group
Journal name Physical Review B   Check publisher's open access policy
ISSN 1098-0121
Publication date 2009-06-05
Year available 2009
Sub-type Article (original research)
DOI 10.1103/PhysRevB.79.235107
Open Access Status File (Publisher version)
Volume 79
Issue 23
Start page 23107-1
End page 23107-9
Total pages 9
Editor P. D. Adams
Place of publication United States
Publisher American Physical Society
Language eng
Subject C1
020603 Quantum Information, Computation and Communication
970102 Expanding Knowledge in the Physical Sciences
Abstract We study the spectral properties of the one-dimensional Kondo lattice model as a function of the exchange coupling, the band filling, and the quasimomentum in the ferromagnetic and paramagnetic phases. Using the density-matrix renormalization group method, we compute the dispersion relation of the quasiparticles, their lifetimes, and the Z factor. Sigrist et al. [Phys. Rev. Lett. 67, 2211 (1991)] provided the exact ground state and the quasiparticle-dispersion relation of the Kondo lattice model with one conduction electron. The quasiparticle could be identified as the spin polaron. Our calculations of the dispersion relation for partial band fillings give a result similar to the one-electron case, which suggests that the quasiparticle in both cases is the spin polaron. We find that the quasiparticle lifetime differs by orders of magnitude between the ferromagnetic and paramagnetic phases and depends strongly on the quasimomentum.
Keyword Phase-diagram
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
2010 Higher Education Research Data Collection
 
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Created: Thu, 03 Sep 2009, 17:52:38 EST by Mr Andrew Martlew on behalf of School of Mathematics & Physics