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DESCRIPTION:Disorder-driven decoherence in solid-state attosecond dynamics\nDavid N Purschke | University of Rochester\n\nAbstract: \nFemtosecond lasers create flashes of coherent light with unimaginably short pulse durations\, providing an ultrafast window into the quantum dynamics of matter. Recently\, the mid-infrared has emerged as an important spectral range\, and is an excellent starting point for generating both long-wavelength terahertz radiation and short-wavelength x-rays for attosecond science. Furthermore\, the low photon energy facilitates field driven processes such as tunneling and high-harmonic generation in semiconductors and insulators. In high-harmonic generation\, the strong laser field tears apart electrons and holes from their bound states and launches them on recolliding trajectories that explore the local energy landscape. In this talk\, I will discuss recent results studying amorphized silicon driven by intense mid-infrared light [1]. I will show how local disorder on few-nm length scales – deeply subwavelength relative to the mid-infrared wavelength – is imprinted into the high-harmonic generation spectrum\, revealing hidden medium-range order and enabling us to estimate the correlation length. Furthermore\, and time permitting\, I will discuss new research avenues of my group at the Laboratory for Laser Energetics\, including novel sources of mid-infrared bright quantum light [2] and coherent control of near-field ultrabroadband RF in laser-plasma channels [3].\n[1] Purschke et al. “Giant enhancement of attosecond tunnel ionization competes with disorder-driven decoherence in amorphized silicon\,” arXiv:2511.14678\n[2] Lemieux et al. “Photon bunching in high-harmonic emission controlled by quantum light\,” Nature Photonics 19 (2025)\n[3] Garrett et al. “Detection of surface waves during femtosecond filamentation\,” Physical Review E 111 (2025)
X-ALT-DESC;FMTTYPE=text/html:Disorder-driven decoherence in solid-state attosecond dynamics<br />David N Purschke | University of Rochester<br><br>Abstract: <br />Femtosecond lasers create flashes of coherent light with unimaginably short pulse durations, providing an ultrafast window into the quantum dynamics of matter. Recently, the mid-infrared has emerged as an important spectral range, and is an excellent starting point for generating both long-wavelength terahertz radiation and short-wavelength x-rays for attosecond science. Furthermore, the low photon energy facilitates field driven processes such as tunneling and high-harmonic generation in semiconductors and insulators. In high-harmonic generation, the strong laser field tears apart electrons and holes from their bound states and launches them on recolliding trajectories that explore the local energy landscape. In this talk, I will discuss recent results studying amorphized silicon driven by intense mid-infrared light [1]. I will show how local disorder on few-nm length scales – deeply subwavelength relative to the mid-infrared wavelength – is imprinted into the high-harmonic generation spectrum, revealing hidden medium-range order and enabling us to estimate the correlation length. Furthermore, and time permitting, I will discuss new research avenues of my group at the Laboratory for Laser Energetics, including novel sources of mid-infrared bright quantum light [2] and coherent control of near-field ultrabroadband RF in laser-plasma channels [3].<br />[1] Purschke et al. “Giant enhancement of attosecond tunnel ionization competes with disorder-driven decoherence in amorphized silicon,” arXiv:2511.14678<br />[2] Lemieux et al. “Photon bunching in high-harmonic emission controlled by quantum light,” Nature Photonics 19 (2025)<br />[3] Garrett et al. “Detection of surface waves during femtosecond filamentation,” Physical Review E 111 (2025)
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SUMMARY:IQC Special Seminar featuring David Purschke
DTSTART;TZID=America/New_York:20260807T153000
DTEND;TZID=America/New_York:20260807T163000
DTSTAMP:20260825T011846Z
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