Nature Reviews Physics, Год журнала: 2024, Номер unknown
Опубликована: Дек. 16, 2024
Язык: Английский
The Journal of Physical Chemistry A, Год журнала: 2025, Номер unknown
Опубликована: Янв. 27, 2025
This study investigates the motion of an electron in a Coulomb potential driven by intense linearly polarized XUV laser pulse analyzed using Gordon-Volkov wave functions. The function is decomposed into spherical partial waves to model scattered packet after recollision with proton. interaction triggers high harmonic generation, producing coherent X-ray pulses frequencies that are integer multiples field. research presents novel method for achieving atomic-scale resolution at nanometer and subfemtosecond levels, enabling observation electron-proton collisions on attosecond time scale. It emphasizes coupling fields create resonances through photon energy exchange pulses, leading formation Rydberg levels up n = 27 angular momentum components l 13 m ± 1. combination high-frequency introduces new nonperturbative nonlinear phenomena characterized differential cross sections derived Floquet-Lippmann-Schwinger equation first-order Born approximation. analysis shows backward-forward scattering involves XUV-electron exchange, peak intensity along polarization vector, while sideways scattering, dominated X-ray-electron interaction, peaks perpendicular polarization. Additionally, laser-assisted process results temporary capture dressed proton-bound state, followed escape ejection, free ponderomotive exceeding 10Up.
Язык: Английский
Процитировано
0
APL Photonics, Год журнала: 2025, Номер 10(1)
Опубликована: Янв. 1, 2025
Attosecond science and technology have emerged as a promising path for improving our understanding of light–matter interaction. High harmonic generation based light sources combine high photon energy, broad spectrum, short duration with relatively compact implementation, which makes them flexible tools to study modify physical chemical properties matter by acting directly on electronic degrees freedom. Because extreme ultraviolet radiation interacts primarily outer inner valence electrons, it finds likely applications in atomic, molecular, material science. Despite their spectacular successes, the development these is still subject intense investigations, searching performances terms specifications reliability. In this perspective article, we present some current developments sources, well related quantum attosecond dynamics atoms molecules.
Язык: Английский
Процитировано
0
Physical Review Research, Год журнала: 2025, Номер 7(2)
Опубликована: Апрель 16, 2025
We show that by combining strong-field dressing and resonant propagation of XUV pulses, the transition absorption lines from their natural Lorentzian profiles through Fano complex multipeak shapes all way back to broadened near-Lorentzian can be achieved, in limit optically thick samples. The final stage this spectral modification understood terms a significant temporal stretching delay pulse as it propagates dense gas, which alters ultrafast is modified time-synchronized few-femtosecond laser pulse. first demonstrate concept numerical calculations, both using model system fully coupled solution time-dependent Schrödinger equation Maxwell wave equation. applicability generality underlying mechanism then illustrated proof-of-principle attosecond transient measurements helium gas with widely varying atomic density. These results provide insights into interaction ultrashort pulses media its coherent control. Published American Physical Society 2025
Язык: Английский
Процитировано
0
Acta Physica Sinica, Год журнала: 2025, Номер 74(15), С. 0 - 0
Опубликована: Янв. 1, 2025
Attosecond transient absorption spectroscopy (ATAS) is an all-optical pump-probe technique that employs attosecond pulses (from the extreme ultraviolet to soft X-ray) excite or probe a system, enabling real-time tracking of electronic transitions, quantum state evolution, and energy transfer processes. This approach offers key advantages: (1) ultrafast temporal resolution (sub-femtosecond) combined with high spectral (millielectronvolt level); (2) broadband excitation multiple states, allowing simultaneous detection across levels; (3) element- site-specific insights afforded by inner-shell valence transition measurements reveal charge dynamics, spin changes, local structural evolution. To date, significant breakthroughs have been achieved in atomic/molecular physics, coherent strong-field physics using ATAS. paper systematically reviews technical principles theoretical models associated ATAS employing moderately strong near-infrared pulses, analyzes recent progress applications both gas-phase condensed-phase systems, explores its future prospects physical chemistry materials. In environments, has demonstrated capabilities probing level shifts population transfers atomic as well capturing nonadiabatic dynamics migration diatomic polyatomic molecules. contrast, within effectively used study carriers semiconductors examine interaction localized electrons insulators metals. Given rapid evolution laser technologies distinct advantages approach, also outlines potential directions. These promise further extend frontiers drive advances range disciplines fundamental research technological applications.
Язык: Английский
Процитировано
0
Опубликована: Март 8, 2024
Light fields can sculpt the optical and electronic properties of solids by injecting charge carriers from valence to conduction band. The photoinjection process typically unfolds on time scales shorter than period driving radiation, thus being - for visible near-infrared light below one femtosecond. Despite pervasive, only a few experiments investigated photoinduced excitation produced an intense, ultrashort laser pulse with attosecond temporal resolution. Here we used transient reflection spectroscopy in combination two-fold, advanced theoretical approach demonstrate that there is not single photoexcitation mechanism responsible injection germanium. Instead, it stems multi-photon absorption band dressing, while intra-band motion has hindering effect.
Язык: Английский
Процитировано
0
Structural Dynamics, Год журнала: 2024, Номер 11(4)
Опубликована: Июль 1, 2024
Understanding photoinjection in semiconductors-a fundamental physical process-represents the first step toward devising new opto-electronic devices, capable of operating on unprecedented time scales. Fostered by development few-femtosecond, intense infrared pulses, and attosecond spectroscopy techniques, ultrafast charge injection solids has been subject theoretical experimental investigation. Recent results have shown that while under certain conditions can be ascribed to a single, well-defined phenomenon, realistic multi-band semiconductor like Ge, several competing mechanisms determine sub-cycle interaction an light field with atomic electronic structure matter. In this latter case, it is yet unclear how complex balance between different altered chosen geometry, dictated relative orientation crystal lattice laser electric direction. work, we investigate Ge monocrystalline sample temporal resolution two distinct orientations. Our combined effort suggests determining carrier excitation are largely robust against rotation. Nevertheless, alignment unit cell causes non-negligible changes momentum distribution excited carriers their yield. Further experiments needed clarify whether used tune at these extreme
Язык: Английский
Процитировано
0
EPJ Web of Conferences, Год журнала: 2024, Номер 309, С. 07015 - 07015
Опубликована: Янв. 1, 2024
Ultrashort light pulses can be used to manipulate electronic and optical properties of solids at extreme temporal scales, paving the way study ultrafast electron dynamics. In recent years, attosecond-based spectroscopic techniques have proved an instrumental tool in such studies. To this end, we investigated effects crystal orientation on photoinjection dynamics germanium using attosecond transient reflectance spectroscopy (ATRS) aided by time-dependent density functional theory (TD-DFT) calculations. Our results show that ATRS is sensitive subtle changes due orientation, although carrier qualitatively robust against rotation, displaying similar processes timings two different angles.
Язык: Английский
Процитировано
0
Physical review. A/Physical review, A, Год журнала: 2024, Номер 110(5)
Опубликована: Ноя. 25, 2024
Язык: Английский
Процитировано
0
Nature Reviews Physics, Год журнала: 2024, Номер unknown
Опубликована: Дек. 16, 2024
Язык: Английский
Процитировано
0