Results 81 to 90 of about 30,908 (277)

Exciton Binding Energy Modulation in 2D Perovskites: A Phenomenological Keldysh Framework

Advanced Functional Materials, EarlyView.
The intrinsic screening effects are successfully decoupled from structural distortion by rigorously designing a series of 2D perovskites. This enabled us to demonstrate how the dielectric environment modulates the quasiparticle bandgap and exciton binding energy.
Kitae Kim, Namhee Kwon, Sang Woo Park, Wonsik Kim, Seunghwan Kim, Eunki Yoon, Aelim Ha, Donggyu Lee, Young Yong Kim, Jong‐Cheol Lee, Sungho Lee, Junghan Lee, Kyu Hyoung Lee, Yeonjin Yi, Ki‐Ha Hong, Soohyung Park   +15 more
wiley   +1 more source

Layer specific observation of slow thermal equilibration in ultrathin metallic nanostructures by femtosecond X-ray diffraction

Nature Communications, 2018
Heat transport in ultrathin metal layers is important for potential applications in optical‐magnetic switching, but difficult to access experimentally.
J. Pudell, A. A. Maznev, M. Herzog, M. Kronseder, C. H. Back, G. Malinowski, A. von Reppert, M. Bargheer   +7 more
doaj   +1 more source

Signatures of electronic and nuclear coherences in ultrafast molecular x-ray and electron diffraction

Structural Dynamics, 2021
Femtosecond x-ray and electron diffraction hold promise to image the evolving structures of single molecules. We present a unified quantum-electrodynamical formulation of diffraction signals, based on the exact many-body nuclear + electronic wavefunction
Jérémy R. Rouxel, Daniel Keefer, Shaul Mukamel   +2 more
doaj   +1 more source

Sub-nanometre resolution of atomic motion during electronic excitation in phase-change materials

, 2016
Phase-change materials based on Ge-Sb-Te alloys are widely used in industrial applications such as nonvolatile memories, but reaction pathways for crystalline-to-amorphous phase-change on picosecond timescales remain unknown. Femtosecond laser excitation
Bragaglia, Valeria, Brewe, Dale, Calarco, Raffaella, Fons, Paul, Giussani, Alessandro, Hase, Muneaki, Katayama, Tetsuo, Kolobov, Alexander V., Makino, Kotaro, Mitrofanov, Kirill V., Ogawa, Kanade, Riechert, Henning, Sato, Takahiro, Shimada, Toru, Terashima, Ryo, Togashi, Tadashi, Tominaga, Junji, Wall, Simon, Yabashi, Makina   +18 more
core   +1 more source

Light-induced picosecond rotational disordering of the inorganic sublattice in hybrid perovskites. [PDF]

, 2017
Femtosecond resolution electron scattering techniques are applied to resolve the first atomic-scale steps following absorption of a photon in the prototypical hybrid perovskite methylammonium lead iodide.
Coffee, Ryan, Egger, David A, Fry, Alan, Guzelturk, Burak, Hu, Te, Karunadasa, Hemamala I, Kronik, Leeor, Li, Renkai, Lindenberg, Aaron M, Liu, Shi, Makasyuk, Igor, Miyata, Kiyoshi, Rappe, Andrew M, Robinson, Joseph S, Shen, Xiaozhe, Smith, Matthew D, Tan, Liang Z, Trinh, M Tuan, Wang, Xijie, Wu, Xiaoxi, Zheng, Qiang, Zhu, Xiaoyang   +21 more
core   +2 more sources

A modular table-top setup for ultrafast x-ray diffraction

Review of Scientific Instruments
We present a table-top setup for femtosecond time-resolved x-ray diffraction based on a Cu Kα (8.05 keV) laser driven plasma x-ray source. Due to its modular design, it provides high accessibility to its individual components (e.g., x-ray optics and sample environment). The Kα-yield of the source is optimized using a pre-pulse scheme.
W. Lu, M. Nicoul, U. Shymanovich, A. Tarasevitch, M. Horn-von Hoegen, D. von der Linde, K. Sokolowski-Tinten   +6 more
openaire   +3 more sources

Anharmonic Lattice Dynamics in Germanium Measured with Ultrafast X-Ray Diffraction

Physical Review Letters, 2000
Damping of impulsively generated coherent acoustic oscillations in a femtosecond laser-heated thin germanium film is measured as a function of fluence by means of ultrafast x-ray diffraction. By simultaneously measuring picosecond strain dynamics in the film and in the unexcited silicon substrate, we separate anharmonic damping from acoustic ...
Cavalleri, Andrea, Siders, Craig W., Brown, F.L.H., Leitner, D.M., Tóth, Csaba, Squier, J.A., Barty, Christopher P.P., Wilson, Kent R., Sokolowski-Tinten, Klaus, Horn-von Hoegen, Michael, von der Linde, Dietrich, Kammler, Martin   +11 more
openaire   +5 more sources

Electron–Matter Interactions During Electron Beam Nanopatterning

Advanced Functional Materials, EarlyView.
This article reviews the electron–matter interactions important to nanopatterning with electron beam lithography (EBL). Electron–matter interactions, including secondary electron generation routes, polymer radiolysis, and electron beam induced charging, are discussed.
Camila Faccini de Lima, Prathiba Thamizhavel, Taylor J. Woehl   +2 more
wiley   +1 more source

New Light on Molecular and Materials Complexity: 4D Electron Imaging [PDF]

, 2009
In this Perspective, 4D electron imaging is highlighted, after introducing some concepts, with an overview of selected applications that span chemical reactions, molecular interfaces, phase transitions, and nano(micro)mechanical systems.
Shorokhov, Dmitry, Zewail, Ahmed H.
core   +1 more source

Exciton‐Polaritons in Nanoscale Metal‐Organic Frameworks: A Platform for the Reversible Modulation of Strong Light‐Matter Coupling via the Chemical Environment

Advanced Functional Materials, EarlyView.
Strong exciton‐photon coupling is achieved by integrating porphyrin ligand‐based MOF nanoparticles in optical cavities, as evidenced by pronounced polariton branch anticrossing. The porous nature of the resonator enables precise, reversible tuning via vapor pressure, unlocking unprecedented chemical‐environment controlled dynamic polaritonic platforms ...
Beatriz de Sola‐Báez, Laura Caliò, Mauricio E. Calvo, Juan F. Galisteo‐López, Jesús Hernández‐Saz, Miriam Herrera‐Collado, Carolina Carrillo‐Carrión, Hernán Míguez   +7 more
wiley   +1 more source