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Matteo Mitrano, Harvard University

Condensed Matter Seminar - "Ultrafast many-body dynamics and control of a driven quantum chain"

Event Type
Physics - Condensed Matter
ESB 190
Oct 13, 2023   1:00 pm  
Matteo Mitrano, Harvard University
Stephen Bullwinkel
Originating Calendar
Physics - Condensed Matter Seminar

Over the last two decades, intense ultrashort electromagnetic fields have enabled observing and controlling a number of emergent states in quantum materials. Some of most spectacular light-induced phenomena, such as superconducting-like phases, transient charge density wave ordering, and excitonic condensation, are found to occur in materials dominated by strong electronic correlations with a large susceptibility to external stimuli. Recently, it has been theoretically argued that quasi-one-dimensional Mott insulators might host exotic and genuinely nonequilibrium ordering phenomena upon photoexcitation, such as h-pairing superconductivity. In these systems, the light-matter interaction can promote a nonthermal population of holes and double-occupancies, but also directly modify the effective many-body interactions, such as electron hopping amplitudes and electron-electron repulsion. 

In this talk, I will report about our recent ultrafast optical studies on a paradigmatic quantum chain – the quasi-1D cuprate Sr2CuO– and discuss implications for the realization of new driven states in photoexcited Mott insulators. First, I will discuss our observation that intense midinfrared light photons enable controlling the high harmonic emission of Sr2CuO3 by reshaping the many-body states contributing to its large optical nonlinearity. Then, I will focus on how the connection between these light-induced changes and a light-induced renormalization of effective interactions.  Finally, I will show how time-resolved x-ray spectroscopy allow us to fully reconstruct the driven many-body state.  

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