Physics and Astronomy Colloquium
Lightwave-driven Quantum Dynamics: Molecular “Selfie” to Floquet Oscillation
Presented by Dr. Jens Biegert, Barcelona Institute of Science and Technology
Electron recollision in an intense laser field gives rise to a variety of phenomena, ranging from electron diffraction to coherent soft X-ray emission. We have, over the years, developed intense sources of waveform-controlled mid-IR light to exploit the process with respect to ponderomotive scaling, quantum diffusion and quasi-static photoemission. I will describe how we leverage these aspects to “teach” molecules to take a selfie while undergoing structural change. This permits visualizing for the first time, with combined attosecond temporal and atomic spatial resolution, molecular bond breaking and deprotonation. Furthermore, we achieve isolated attosecond pulses in the soft X-ray water window across the oxygen edge at 543 eV. Accomplishing ultrafast temporal resolution in combination with the soft X-ray’s element and state specificity now provides an entirely new view on the combined electronic and nuclear dynamics in real time. I will show first results in which we resolve the carrier dynamics in a quantum material in real time and within the material’s unit cell. These results provide first insight into the dynamics of molecules and carriers in condensed matter, with the future possibility to address fundamental questions such as the exact nature of the coupling between charge carriers, or carriers and nuclei / lattice.
3:30 pm, Friday, October 18, 2019
Room 125, Dane Smith Hall
Southwest corner of Las Lomas and Yale, Albuquerque, New Mexico
Refreshments will be available before the colloquium, at 3:15 pm, in the lobby of Dane Smith Hall.
Individuals with disabilities who need an auxiliary aid or service to attend or participate in P&A events should contact Sandra Ortiz (phone: 505-277-5900, email: firstname.lastname@example.org) well in advance to ensure your needs are accomodated. Event handouts can be provided in alternative accessible formats upon request. Please contact Mrs. Ortiz if you need written information in an alternative format.
A schedule of talks within the Department of Physics and Astronomy is available on the P&A web site at http://physics.unm.edu/pandaweb/events/index.php