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RESEARCH PRODUCT
Phase diagram of the two-channel kondo lattice model in one dimension.
P. G. J. Van DongenCristian D. BatistaT. SchauerteReinhard M. NoackDaniel N. Coxsubject
PhysicsQuantum phase transitionRKKY interactionCondensed matter physicsDensity matrix renormalization groupQuantum critical pointQuantum mechanicsGeneral Physics and AstronomyCondensed Matter::Strongly Correlated ElectronsKondo effectCoupling (probability)Lattice model (physics)Phase diagramdescription
Employing the density matrix renormalization group method and strong-coupling perturbation theory, we study the phase diagram of the $\mathrm{SU}(2)\ifmmode\times\else\texttimes\fi{}\mathrm{SU}(2)$ Kondo lattice model in one dimension. We show that, at quarter filling, the system can exist in two phases depending on the coupling strength. The weak-coupling phase is dominated by RKKY exchange correlations, while the strong-coupling phase is characterized by strong antiferromagnetic correlations of the channel degree of freedom. These two phases are separated by a quantum critical point. For conduction-band fillings of less than one-quarter, we find a paramagnetic metallic phase at weak coupling and a ferromagnetic phase at moderate to strong coupling.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2004-07-06 | Physical review letters |