Piotr Grochowski High harmonic spectroscopy of quantum phase transitions in a high-Tc superconductor
Channel: Centrum Fizyki Teoretycznej PAN
Date: 2022-03-30

Dr Piotr Grochowski (CFO - Institut de Ciencies Fotoniques; Center for Theoretical Physics PAS; Austrian Academy of Sciences; University of Innsbruck).
High harmonic spectroscopy of quantum phase transitions in a high-Tc superconductor
We report on the new non–linear optical signatures of quantum phase transitions in the high-temperature superconductor YBCO, observed through high harmonic generation. While the linear optical response of the material is largely unchanged when cooling across the phase transitions, the nonlinear optical response sensitively imprints two critical points, one at the critical temperature of the cuprate with the exponential growth of the surface harmonic yield in the superconducting phase, and another critical point, which marks the transition from strange metal to pseudogap phase. To reveal the underlying microscopic quantum dynamics, a novel strong-field quasi-Hubbard model was developed, which describes the measured optical response dependent on the formation of Cooper pairs. Further, the new theory provides insight into the carrier scattering dynamics and allows to differentiate between the superconducting, pseudogap,and strange metal phases. The direct connection between non–linear optical response and microscopic dynamics provides a powerful new methodology to study quantum phase transitions in correlated materials. Further implications are light-wave control over intricate quantum phases, light-matter hybrids, and application for optical quantum computing.
Wednesday colloquium at CTP PAS - 2022-03-16