Berlin 2024 – scientific programme

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QI: Fachverband Quanteninformation

QI 13: Poster MP (joint session MP/QI)

QI 13.7: Poster

Tuesday, March 19, 2024, 11:00–13:00, Poster B

Microscopic mechanism of photo-induced tip-surface currents driven by near-infrared pulses — •Carlos Bustamante¹, Franco Bonafé¹, Simon Maier², Rupert Huber², and Angel Rubio¹ — ¹Max Planck Institute for the Structure an Dynamics of Matter, Hamburg, Germany. — ²Department of Physics, University of Regensburg, Regensburg, Germany.

The control of photo-induced currents from a tip using terahertz laser pulses, when combined with electronic microscopy, has allowed the study of ultrafast dynamics at the atomic scale. Although the charge transfer process has been described by simplified models, further improvement of this technique to achieve shorter time scales and better resolution at the atomic scale requires an ab initio framework. In this work, we have studied the electron dynamics of a tip-surface arrangement described atomistically, when interacting with near-infrared single-cycle laser pulses using TDDFT. Our results provide further insight into the nature of the photo-current induced by the laser pulse, its dependence on the electric field amplitude of the laser and the role of multiphoton absorption.

Keywords: tddft; nanoplasmonics; photocurrent; electron dynamics