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Keywords = attosecond transient absorption spectroscopy

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16 pages, 811 KB  
Article
Analytical Theory of Attosecond Transient Absorption Spectroscopy of Perturbatively Dressed Systems
by Daria Kolbasova and Robin Santra
Appl. Sci. 2019, 9(7), 1350; https://doi.org/10.3390/app9071350 - 30 Mar 2019
Cited by 2 | Viewed by 3783
Abstract
A theoretical description of attosecond transient absorption spectroscopy for temporally and spatially overlapping XUV and optical pulses is developed, explaining the signals one can obtain in such an experiment. To this end, we employ a two-stage approach based on perturbation theory, which allows [...] Read more.
A theoretical description of attosecond transient absorption spectroscopy for temporally and spatially overlapping XUV and optical pulses is developed, explaining the signals one can obtain in such an experiment. To this end, we employ a two-stage approach based on perturbation theory, which allows us to give an analytical expression for the transient absorption signal. We focus on the situation in which the attosecond XUV pulse is used to create a coherent superposition of electronic states. As we explain, the resulting dynamics can be detected in the spectrum of the transmitted XUV pulse by manipulating the electronic wave packet using a carrier-envelope-phase-stabilized optical dressing pulse. In addition to coherent electron dynamics triggered by the attosecond pulse, the transmitted XUV spectrum encodes information on electronic states made accessible by the optical dressing pulse. We illustrate these concepts through calculations performed for a few-level model. Full article
(This article belongs to the Special Issue Attosecond Science and Technology: Principles and Applications)
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14 pages, 2135 KB  
Article
Ab Initio Simulation of Attosecond Transient Absorption Spectroscopy in Two-Dimensional Materials
by Shunsuke A. Sato, Hannes Hübener, Umberto De Giovannini and Angel Rubio
Appl. Sci. 2018, 8(10), 1777; https://doi.org/10.3390/app8101777 - 30 Sep 2018
Cited by 25 | Viewed by 6268
Abstract
We extend the first-principles analysis of attosecond transient absorption spectroscopy to two-dimensional materials. As an example of two-dimensional materials, we apply the analysis to monolayer hexagonal boron nitride (h-BN) and compute its transient optical properties under intense few-cycle infrared laser pulses. [...] Read more.
We extend the first-principles analysis of attosecond transient absorption spectroscopy to two-dimensional materials. As an example of two-dimensional materials, we apply the analysis to monolayer hexagonal boron nitride (h-BN) and compute its transient optical properties under intense few-cycle infrared laser pulses. Nonadiabatic features are observed in the computed transient absorption spectra. To elucidate the microscopic origin of these features, we analyze the electronic structure of h-BN with density functional theory and investigate the dynamics of specific energy bands with a simple two-band model. Finally, we find that laser-induced intraband transitions play a significant role in the transient absorption even for the two-dimensional material and that the nonadiabatic features are induced by the dynamical Franz–Keldysh effect with an anomalous band dispersion. Full article
(This article belongs to the Special Issue Attosecond Science and Technology: Principles and Applications)
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