SKM 2021 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 2: Focus Session: Exotic Charge Density Wave States of Matter: Correlations and Topology (joint session TT/HL)

HL 2.4: Talk

Monday, September 27, 2021, 11:45–12:15, H7

Chiral superconductivity in the alternate stacking compound 4Hb-TaS₂ — •Amit Kanigel — Technion. Haifa, Israel

We study 4Hb-TaS₂, which naturally realizes an alternating stacking of 1T-TaS₂ and 1H-TaS₂ structures. The former is a well-known Mott insulator, which has recently been proposed to host a gapless spin-liquid ground state. The latter is a superconductor known to also host a competing charge density wave state. We find a superconductor with a T_c of 2.7 Kelvin and anomalous properties, of which the most notable one is a signature of time-reversal symmetry breaking, abruptly appearing at the superconducting transition. This observation is consistent with a chiral superconducting state.