Lightwave-driven Quantum Dynamics: Molecular “Selfie” to Floquet Oscillation
Date | Mo, 14.10.2019 | |
Time | 16:45h | |
Speaker | Prof. Dr. Jens Biegert ICFO, Institute of Photonic Sciences, Barcelona, Spain | |
Location | ETH Hönggerberg, HPF G6 | |
Program | 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. 1) 2D IR-Raman spectroscopy for liquid water [1]. 2) Machine learning approach for modeling liquids water [2] 2) 2D electronic vibrational spectroscopies (2DEVS) for non-adiabatic transition system[3-5] References (PDF: http://theochem.kuchem.kyoto-u.ac.jp/public/) [1] H. Ito and Y. Tanimura, Simulating 2D IR-Raman and Raman spectroscopies for inter-molecular and intramolecular modes of liquid water, J.Chem.Phys.144, 074201 (2016).(pdf) [2] S. Ueno and Y. Tanimura, Modeling intermolecular and intramolecular modes of liquid water with using multiple heat baths: Data-mining approach, in preparation. [3] T. Ikeda and Y. Tanimura, Probing photo isomerization processes by means of multi-dimensional electronic spectroscopy: The multi-state quantum hierarchal Fokker-Planck Equation approach, J. Chem. Phys. 146, 014102 (2017).(pdf) [4] T.Ikeda and Y.Tanimura, Phase-space wavepacket dynamics of internal conversion via conical intersection: Multi-state q. Fokker-Planck eq. approach, Chem. Phys. 515, 203 (2018). (pdf) [5] T. Ikeda and Y. Tanimura, Low-Temperature Q. Fokker-Planck and Smoluchowski Equations and Their Extension to Multistate Systems, J. Chem.Theo. Comp.15 2517 (2019). (pdf) [6] T. Ikeda, Y. Tanimura and A. Dijkstra, Modeling and analyzing a photo-driven molecular motor system: Ratchet dynamics and non-linear optical spectra, J. Chem. Phys. 150, 114103 (2019). (pdf) 2D IR-Raman spectra of liquid water calculated from full MD simulations for (i) 2D Raman-IR-IR, (ii) 2D IR-Raman-IR and (iii) 2D IR-IR-Raman spectroscopies. (Ref. [1]) 2D EVS for non-adiabatic dynamics (Ref .3) Transient absorption spectra of a three-state system (right figure) for an overdamped case obtained from the (i) multi-state quantum Smoluchowski Eq. (MS-QSE-LT) (ii) multi-state classical Smoluchowski Eq. (MS-SE) or Zusman Eq., (iii) fewest switch surface hopping (FSSH) methods, and (iv) Ehrenfest methods, respectively. (Ref. [5]) |
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Link | fastlab.ethz.ch |