Date : December 6, 2022, 16:00 CET

Erik van Heumen (University of Amsterdam)


Probing low energy quantum matter


In this talk I will discuss how optical experiments probe quantum matter using recent results from my group. In the second part, I will focus on the strange metal phase of the cuprates, which features a variety of anomalous electronic properties. In recent years, various (magneto-) transport experiments have reported a singular behavior of the carrier density near a critical doping around p = 0.2 holes/Cu and these results have been interpreted as essential features of the strange metal response.

I will review these results considering the doping evolution of the optical conductivity across the phase diagram for the single layer material Bi2201. Whereas transport experiments only probe a combination of momentum relaxation and carrier density, the optical response enables us to disentangle the two. I will show that the doping and temperature evolution of the resistivity can be fully understood from changes in the momentum relaxation rate. At the same time, the carrier density displays a continuous and gradual evolution across the phase diagram.