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1st TIMES Workshop joint with ETSF

7–10 Apr 2025
Main Physics Building
Europe/London timezone

Local organizer

Session

Session 6

10 Apr 2025, 09:00
Bell Lecture Theatre (Main Physics Building)

Bell Lecture Theatre

Main Physics Building

School of Mathematics and Physics Queen's University Belfast University Rd, Belfast BT7 1NN, United Kingdom

Conveners

Session 6

  • Davide Sangalli (Istituto di Struttura della Materia (ISM) - CNR)

Presentation materials

There are no materials yet.

  1. 51. Polarization Effects in Transient Absorption Measurements and the Detection of the Emission of Coherent Optical and Acoustic Phonons
    Patrick O'Keeffe (National Research Council)
    10/04/2025, 09:15
    Talk

    Optical femtosecond transient absorption and reflectivity spectroscopies are the most common experimental techniques used to study the ultrafast dynamics of photoexcited carriers and excitons in materials. However, unfortunately, the interpretation of the data is far from straightforward and often requires support from theoretical studies to be able give a reliable interpretation of the raw...

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  2. 45. Ehrenfest time-dependent Hartree-Screened Exchange: Unveiling the Role of Core Electrons and Phonon Renormalization in the Small Displacement Limit
    Savio Laricchia (Istituto di Struttura della Materia-CNR (ISM-CNR))
    10/04/2025, 09:55
    Talk

    In this talk, I will present a theoretical study on the Ehrenfest time-dependent Hartree-Screened Exchange (TD-HSEX) equations of motion, focusing on the role of core electrons and electron-phonon (e-ph) interactions in near-equilibrium regimes. TD-HSEX, derived from non-equilibrium Green’s functions (NEGF) theory[1], accurately captures coherent excitonic dynamics beyond the limitations of...

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  3. 35. Light-induced structural changes from electron-phonon interaction
    Christoph Emeis (Kiel University)
    10/04/2025, 10:35
    Talk

    Coherent phonons offer a powerful means to manipulate structural and electronic properties of materials on ultrafast timescales, enabling control of light-induced phase transitions and non-equilibrium dynamical phenomena.

    We develop an $\textit{ab initio}$ framework to describe the excitation of coherent phonons in semimetals by combining electron-phonon coupling calculations and the...

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  4. 54. Real and Virtual Charge Dynamics Investigated via Attosecond Transient Reflection Spectroscopy
    Simone Bonetti (Politecnico di Milano)
    10/04/2025, 11:40
    Talk

    Approaching the attosecond time scale is crucial for advancing petahertz opto-electronics, that is the capability to coherently control and manipulate the optical properties of solid-state materials when excited by PHz fields, offering processing speed much beyond current limits.

    With this respect, Attosecond Transient Reflection Spectroscopy (ATRS) in solids has emerged as a reliable tool...

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  5. 34. Sum frequency generation from real-time simulations in two-dimensional crystals
    Claudio Attaccalite (CNRS/Aix-Marseille Université CINaM)
    10/04/2025, 12:20
    Talk

    Sum frequency generation (SFG) and difference frequency generation (DFG) are second order nonlinear processes where two lasers with frequencies ω_1 and ω_2 combine to produce a response at frequency ω = ω_1 ± ω_2 . Compared with other nonlinear responses, such as second harmonic generation, SFG and DFG allow for tunability over a larger range and by selecting the two laser frequencies, one can...

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