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

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Cited by in corpus (13)

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• Topological Invariants and Ground-State Wave Functions of Topological Insulators on a Torus
• Magnetic states in a three-dimensional topological Kondo insulator
• Topological Mott insulator in the odd-integer filled Anderson lattice model with Hatsugai-Kohmoto interactions
• Characterization of a correlated topological Kondo insulator in one dimension
• Impact of the Rashba Spin Orbit Coupling on $f$-electron Materials
• Restoration of topological properties at finite temperatures in a heavy-fermion system
• Kramers' doublet ground state in topological Kondo insulators
• Topological quantum phase transition in Kane-Mele-Kondo lattice model
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• Topological property of a $t_{2g}^5$ system with a honeycomb lattice structure
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