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TT: Fachverband Tiefe Temperaturen

TT 37: Correlated Electrons: Poster

TT 37.5: Poster

Mittwoch, 19. März 2025, 15:00–18:00, P4

Terahertz Time-domain Spectroscopy on the Topological Kondo Insulator SmB₆ — •Zekai Chen, Debankit Priyadarshi, Erik de Vos, and Manfred Fiebig — Department of Materials, ETH Zurich, Zurich, Switzerland

We present a terahertz time-domain spectroscopy (THz-TDS) measurement on the topological Kondo insulator samarium hexaboride (SmB₆). These results are aimed at providing insight into the co-existence of a topologically conductive surface state and the opening of a bandgap below the Kondo temperature. Previous work on Kondo insulators has shown that the Kondo quasiparticles disintegrate near a quantum critical point (QCP) in response to THz radiation, leading to a delayed echo-pulse-like response in the time domain [1]. In contrast to these materials, SmB₆ exhibits an additional in-gap state that could be related to its topological surface conductivity. In the presented experiment, this in-gap state is resonantly probed with THz radiation. Our measurement concentrates on studying the emergence of the in-gap state through correlated electron interaction.

[1] Nat. Phys. 14, 1103 (2018).

Keywords: Terahertz (THz) spectroscopy; Topological insulators; Kondo Effect; Time-domain spectroscopy