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EuCd2As2 has emerged as a topological material where magnetism may produce strong effects. This compound has been understood as a candidate Weyl semimetal, based mostly on transport and photoemission measurements. I will present our recent results on samples in which we control the carrier concentration through chemical synthesis. We find magneto-optical evidence of a sizeable band gap, remarkably sensitive to the local Eu magnetism. Our results contradict the current consensus on the ground state of this compound, bringing into question its topological nature.

You can download the slides for this presentation here (pdf).

Reference: Santos-Cottin et al., EuCd2As2: a magnetic semiconductor,

Register at this doodle before Thursday 2 March, 20:00 in the evening.

Location: Stuckelberg, Ecole de Physique
Time: Friday 3 March 2023, 12:00 for pizza, 12:30 start discussion