Tunable "Doniach Phase Diagram" for strongly-correlated nanoclusters

Abstract

Exact diagonalization calculations reveal that the energy spacing $\Delta$ in the conduction band tunes the interplay between the {\it local} Kondo and {\it non local} RKKY interactions, giving rise to a "Doniach phase diagram" for a nanocluster with regions of prevailing Kondo or RKKY correlations. The parity of the total number of electrons alters the competition between the Kondo and RKKY correlations. This interplay may be relevant to experimental realizations of small rings or quantum dots with tunable magnetic properties. Below a critical value V${}_c$ of the hybridization the susceptibility exhibits a low-T exponential activation behavior determined by the interplay of the spin gap and $\Delta$.

arXiv comment4 pages, 5 figures

References in corpus (12)

• Quantum phase transition from a superfluid to a Mott insulator in a gas of ultracold atoms
• Kondo Physics in a Single Electron Transistor
• Deterministic entanglement of two trapped ions
• Onset of antiferromagnetism in heavy fermion metals
• Spatial Correlations in Dynamical Mean Field Theory
• The Kondo Box: A Magnetic Impurity in an Ultrasmall Metallic Grain
• Detecting the Kondo screening cloud in conductance measurements on quantum dots
• Band-filling effects on the Kondo-lattice properties
• Mesoscopic Kondo screening effect in a single-electron transistor embedded in a metallic ring
• Kondo impurities in nanoscopic systems: new confinement-induced regimes
• Kondo effect and STM spectra through ferromagnetic nanoclusters
• Finite temperature properties of the 2D Kondo lattice model

Cited by in corpus (10)

• Constructive influence of the induced electron pairing on the Kondo state
• Competition between Kondo screening and indirect magnetic exchange in a quantum box
• Kondo Lattice Model with Finite Temperature Lanczos Method
• Screening mechanisms in magnetic nanostructures
• Antiferromagnetism beyond classical percolation threshold in the site-diluted half-filled one-band Hubbard model in three dimensions
• Entanglement in Anderson Nanoclusters
• Boundary and finite-size effects in the competition between indirect magnetic exchange and Kondo screening
• Nonequilibrium Kondo-vs-RKKY Scenarios in Nanoclusters
• Non-Hamiltonian dynamics of indirectly coupled classical impurity spins
• Kondo Screening and Indirect Magnetic Exchange through a Conventional Superconductor Studied by the Density-Matrix Renormalization Group