ÖPG-CMD Joint Meeting 2026

Matrix element effects in time-resolved photoemission tomography from a non-equlibrium Greens function approach

Sep 22, 2026, 12:00 PM

15m

HS 15.06 (University of Graz)

3) Contributed talk M19 - Time-resolved photoemission orbital tomography Mini-Colloquium

Speaker

Christian Kern (Institute of Physics, University of Graz)

Description

Non-equlibrium Greens function (NEGF) methods provide very powerful tools to simulate time-resolved photoemission spectroscopy [1], including the strong-field regime or experimental conditions where pump and probe pulses overlap in time. In the past, most applications of NEGF for tr-ARPES have concentrated on calculating the spectral function only, and have thus neglected effects of the probe pulse (or matrix-element effects). Especially for molecular systems, the latter can, however, be the dominant contributions to the photoemission signal and lie at the heart of photoemission (orbital) tomography (POT). In this contribution we show how a recently developed framework for matrix-element effects in exciton-POT [2] can be extended to NEGF methods, allowing for a simulation of pump-probe experiments in real-time.

[1] J. K. Freericks, H. R. Krishnamurthy and T. Pruschke, Theoretical Description of Time-Resolved Photoemission Spectroscopy: Application to Pump-Probe Experiments, PRL 102, 136401 (2009).
[2] S. Kaidisch, A. Kleiner, S. Refaely-Abramson, P. Puschnig and C. S. Kern, Photoemission tomography of excitons: momentum-space signatures of correlated electron-hole wave functions, arxiv.org/abs/2511.14956 (2026).