Calendario Attività
 

Optical responses of photoexcited materials: from parametric amplification to photoinduced superconductivity

Categoria
Seminario
Data
2022-07-06 15:30 - 16:30
Luogo
S4 - II piano St. 9
Affiliation
Institut f?r Theoretische Physik, ETH Zurich
Area di Ricerca
Transizioni di fase, Sistemi condensati e a molti corpi, Fisica Statistica e loro applicazioni

Optical drives at terahertz and mid-infrared frequencies in quantum materials are commonly used to explore the nonlinear dynamics of interacting many-body systems. Recent experiments demonstrated several surprising optical properties of transient states induced by driving, including the appearance of photo-induced edges in the reflectivity, enhancement of reflectivity, and even light amplification. I will show that many of these unusual properties can be understood from the general perspective of reflectivity from Floquet materials, in which pump-induced oscillations of a collective mode lead to parametric generation of excitation pairs. This analysis predicts a universal phase diagram of drive induced features in reflectivity, which evidence a competition between driving and dissipation. I will argue that this mechanism explains several recent experimental observations, including photoinduced superconductivity in the pseudogap phase of high Tc cuprates. Link Microsoft Teams: https://teams.microsoft.com/l/meetup-join/19%3aM3mFhw1-K1FUplDdgeW2E-l1jTsg2rI5D88Sl-u5hD41%40thread.tacv2/1656941645087?context=%7b%22Tid%22%3a%22c30767db-3dda-4dd4-8a4d-097d22cb99d3%22%2c%22Oid%22%3a%2293bd6b4c-e7f6-41b6-9d13-a27b0f3dcbca%22%7d

 
 

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