Dresden 2017 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 76: Poster Session: Transport 2

TT 76.17: Poster

Donnerstag, 23. März 2017, 15:00–19:00, P2-OG1

3D topological Kondo insulators: Slave-boson mean-field theory and fluctuations — •Soroush Arabi and Johann Kroha — Physikalisches Institut, Universität Bonn, Germany

Topological Kondo insulators (TKI) have recently been proposed as a new system where a gap at the Fermi energy and, subsequently, a non-trivial topological phase are created by strong correlations [1]. The present work investigates the influence of the finite life-time of the heavy Kondo quasiparticles on the stability of a TKI phase. Because of the strong spin-orbit (SO) coupling within the rare-earth 4f-orbitals of a heavy-fermion system, the local ground-state Kramers doublet involves mixing of spin and orbital degrees of freedom. This leads to a topological term in the hybridization of the 4f- and the conduction band [1]. Using slave-boson mean field theory [2], we calculate the band structure of a 3D bulk TKI. We then calculate the layer-dependent band structure near a 2D surface of a 3D TKI. Finite quasiparticle life-time effects are incorporated by taking bosonic fluctuations about the mean field solution into account and by calculating the corresponding selfenergies. We aim at calculating characteristic, observable quantities, like the surface conductivity, including life-time effects.

[1] M. Dzero, et al., Ann. Rev. Cond. Matt. 7, 249-280 (2016)

[2] V. Alexandrov, et al., Phys. Rev. Lett. 114, 177202 (2015)