Topological phase in a two-dimensional metallic heavy-fermion system

Abstract

We report on a topological insulating state in a heavy-fermion system away from half-filling, which is hidden within a ferromagnetic metallic phase. In this phase, the cooperation of the RKKY interaction and the Kondo effect, together with the spin-orbit coupling, induces a spin-selective gap, bringing about topologically non-trivial properties. This topological phase is robust against a change in the chemical potential in a much wider range than the gap size. We analyze these remarkable properties by using dynamical mean field theory and the numerical renormalization group. Its topological properties support a gapless chiral edge mode, which exhibits a non-Tomonaga-Luttinger liquid behavior due to the coupling with bulk ferromagnetic spin fluctuations. We also propose that the effects of the spin fluctuations on the edge mode can be detected via the NMR relaxation time measurement.

5 pages, 3 figures

References in corpus (15)

• Quantum Spin Hall Effect and Topological Phase Transition in HgTe Quantum Wells
• Quantum Spin Hall Insulator State in HgTe Quantum Wells
• Discovery (theoretical prediction and experimental observation) of a large-gap topological-insulator class with spin-polarized single-Dirac-cone on the surface
• A topological Dirac insulator in a quantum spin Hall phase : Experimental observation of first strong topological insulator
• The numerical renormalization group method for quantum impurity systems
• Topological Mott Insulators
• Quantum spin Hall effect in a transition metal oxide Na2IrO3
• Correlated Topological Insulators with Mixed Valence
• Simplified topological invariants for interacting insulators
• Mott Physics and Topological Phase Transition in Correlated Dirac Fermions
• Hybridization, Inter-Ion Correlation, and Surface States in the Kondo Insulator SmB6
• Interaction effects and quantum phase transitions in topological insulators
• Mott Physics on Helical Edges of 2D Topological Insulators
• Coherence and metamagnetism in the two-dimensional Kondo lattice model
• Ferromagnetic state in the one-dimensional Kondo lattice model