ニュース＆トピックス
セミナーのお知らせ: Pascal Krause 氏 (Postdoctoral Research Assistant, Annika Bande Group, Helmholtz-Zentrum Berlin)
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Q-STEPセミナー
日時：２０２３年２月２７日（月）14:00～15:30
14:30 — 15:30, February 27 (Mon), 2023.
場所：東京大学工学部8号館2階226大会議室 ※現地聴講のみ
Room 226, 2F, Engineering Bldg. #8
講演者： Pascal Krause 氏
(Postdoctoral Research Assistant, Annika Bande Group, Helmholtz-Zentrum Berlin)
講演題目: ``Shining Light on Bound State Electrons.''
— Energy Transfer in Coupled Quantum Dots and Electron-hole Pair Formation Visualized
Abstract
This presentation reports explicitly time-dependent light-driven electron dynamics simulations. In the first part the atomistic modeling of coupled quantum dots (QDs) is shown.[1] The creation, transfer, and stabilization of localized excitations can be achieved by a UV/IR pump?dump pulse sequence. Our atomistic treatment reveals how size and geometry variations of three Ge/Si nanocrystals influence transfer times and thus the efficiency of laser-driven populations of the electron-hole pair states.
In the second part the important question of the dynamics in the excited states is addressed.[2]
The knowledge about the particle and hole location is a long-standing quest
as it can help understanding excited state properties.
This presentation introduces a tool box to study the dynamics of optical excitations
on the attosecond time scale in great detail.
The advantages of post-processing the wave packet using an exciton wavefunction analysis are twofold:
i) it enables a detailed view on the process of electron-hole pair formation through animation of various densities, and
ii) it allows a quantification of exciton properties, such as particle/hole positions and exciton sizes,
derived from the one-particle transition density matrix.
LITERATURE:
[1] P. Krause, J.C. Tremblay, A. Bande,
Atomistic Simulations of Laser-Controlled Exciton Transfer and Stabilization in Symmetric Double Quantum Dots,
J. Phys. Chem. A, 125, 4793 (2021)
[2] F. Langkabel, P. A. Albrecht, A. Bande, and P. Krause,
Making optical excitations visible — An exciton wavefunction extension
to the time-dependent configuration interaction method,
Chem. Phys., 557, 111502 (2022)
使用言語：English/英語
紹介教員：石川 顕一
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