【大学频道】中国科学院大学卡弗里理论科学研究所呈献 | Myrta Gruning

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图 | Myrta Gruning

题   目：Nonlinear optics from first-principles real-time approaches

报告人：Myrta Gruning

单   位：Queen's University Belfast

时   间：2019-05-30

地   点：中国科学院大学

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报告摘要

In the past decades, many-body approaches based on the GW approximation and the Bethe-salpeter equation have become the state-of-the-art for calculating optical absorption in solids and nanostructures. In this talk, I'll first present a real-time approach derived from the non-equilibrium Greens function, that allows to extend the GW+BSE approach beyond the linear regime. Using this approach, I'll address the importance of many-body effects and in particular of excitonic effects for nonlinear optical properties. For example, I'II look at the case of single-layer monochalcogenide whose strong Second Harmonic Generation cannot be reproduced within the independent-particle approximation. In the second part of the talk, I'll then discuss the possibility of a real-time approach based on time-dependent density-functional theory, that can describe excitonic effects.

个人简介

Myrta Gruning, Queen's University Belfast & Mathematics and Physics & Lecturer.  She is one of the core developers of the Yambo and is collaborating in the development of Questaal, which both are codes for many-body calculations in solid state. Dr Gruning's main research interests are in the development and application of first-principles approaches to the electronic and optical properties of materials.

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