Výsledky vyhledávání - "Nelson, Keith Adam"

Terahertz field–induced ferroelectricity in quantum paraelectric SrTiO[subscript 3]

Autor: Li, Xian, Qiu, Tian, Zhang, Jiahao, Baldini, Edoardo, Lu, Jian, Rappe, Andrew M., Nelson, Keith Adam

Publikováno v: arXiv

"Hidden phases” are metastable collective states of matter that are typically not accessible on equilibrium phase diagrams. These phases can host exotic properties in otherwise conventional materials and hence may enable novel functionality and app

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=od________88::29f8b644bbf83449727e58b93749734a
https://hdl.handle.net/1721.1/123555

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Measuring Phonon Mean Free Path Distributions by Probing Quasiballistic Phonon Transport in Grating Nanostructures

Autor: Zeng, Lingping, Collins, Kimberlee C., Hu, Yongjie, Luckyanova, Maria N., Chiloyan, Vazrik, Zhou, Jiawei, Huang, Xiaopeng, Chen, Gang, Maznev, Alexei, Huberman, Samuel C., Nelson, Keith Adam

Publikováno v: Nature Publishing Group
Scientific Reports

Heat conduction in semiconductors and dielectrics depends upon their phonon mean free paths that describe the average travelling distance between two consecutive phonon scattering events. Nondiffusive phonon transport is being exploited to extract ph

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::892bda8e3820debe13869724cb7ab074
https://doi.org/10.1038/srep17131

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Nonlinear high-temperature superconducting terahertz metamaterials

Autor: Grady, Nathaniel K., Torchinsky, Darius, Singh, Ranjan, Yan, Li, Trugman, Daniel, Trugman, Stuart A., Jia, Q. X., Taylor, Antoinette J., Chen, Hou-Tong, Perkins, Bradford G., Jr., Hwang, Harold Young, Brandt, Nathaniel Curran, Nelson, Keith Adam, Perkins Jr, Bradford G.

Publikováno v: IOP Publishing

We report the observation of a nonlinear terahertz response of split-ring resonator arrays made of high-temperature superconducting films. Intensity-dependent transmission measurements indicate that the resonance strength decreases dramatically (i.e.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a3b567aa6f406d01148aeeed7988efb3
https://orcid.org/0000-0001-7804-5418

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Nonlinear ultrafast dynamics of high temperature YBa[subscript 2]Cu[subscript 3]O[subscript 7-δ] superconductors probed with THz pump / THz probe spectroscopy

Autor: Grady, Nathaniel K., Yan, L., Trugman, D., Jia, Q. X., Chen, H. T., Taylor, A. J., Perkins, Bradford G., Jr., Hwang, Harold Young, Nelson, Keith Adam, Perkins Jr, Bradford G.

Publikováno v: EPJ Web of Conferences

High power THz pulses induce near transparency in superconductive YBCO thin films below the critical temperature. THz pump/THz probe measurements reveal a decay of the induced transparency on the time scale of a few picoseconds.
United States. O

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=od________88::47c811e8058fb18e656013a593166d82
http://hdl.handle.net/1721.1/82548

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Interferometric analysis of laser-driven cylindrically focusing shock waves in a thin liquid layer

Autor: Keith A. Nelson, Thomas Pezeril, Alexei A Мaznev, Steven E. Kooi, David Veysset

Publikováno v: Scientific Reports, Vol 6, Iss 1, Pp 1-7 (2016)
Nature
Scientific Reports

Shock waves in condensed matter are of great importance for many areas of science and technology ranging from inertially confined fusion to planetary science and medicine. In laboratory studies of shock waves, there is a need in developing diagnostic

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::df002beb4b4cd3af5fce894b0c8e6d27
https://doaj.org/article/966b7206ab33464ca1d76af9628fc4e5

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Real-Time Observation of a Coherent Lattice Transformation into a High-Symmetry Phase

Autor: Johanna W. Wolfson, Keith A. Nelson, Taeho Shin, M. Kandyla, Ilana J. Porter, Yu-Hsiang Cheng, Samuel W. Teitelbaum

Publikováno v: Physical Review X, Vol 8, Iss 3, p 031081 (2018)
American Physical Society

Excursions far from their equilibrium structures can bring crystalline solids through collective transformations including transitions into new phases that may be transient or long-lived. The direct spectroscopic observation of far-from-equilibrium r

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0fd0cf4533c8051787ac70df2eef9449
https://doi.org/10.1103/physrevx.8.031081

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Helium-ion-implantation in tungsten: Progress towards a coherent understanding of the damage formed and its effects on properties

Autor: Wing Kam Liu, R. A. Duncan, Sergei L. Dudarev, Jeffrey K. Eliason, Christian E. Beck, Mark R. Gilbert, Felix Hofmann, Alexei Maznev, D R Mason, Duc Nguyen-Manh, Keith A. Nelson

Publikováno v: Procedia IUTAM
Elsevier

Tungsten is a likely material for divertor armour in fusion reactors. We describe recent progress combining multi-technique experiments with atomistic modelling to understand how injected helium interacts with displacement damage and modifies the phy

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::98aadbfd62bf47879aad36314f6ccf9d
https://ora.ox.ac.uk/objects/uuid:992d58a5-d869-45ea-b985-d04ced9b65fe

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Machine Learning to Analyze Images of Shocked Materials for Precise and Accurate Measurements

Autor: Cindy Bolme, Bernard Meehan, Marylesa Howard, Margaret C. Hock, Keith A. Nelson, Leora Dresselhaus-Cooper, Kyle J. Ramos, Richard L. Sandberg

Publikováno v: arXiv

A supervised machine learning algorithm, called locally adaptive discriminant analysis (LADA), has been developed to locate boundaries between identifiable image features that have varying intensities. LADA is an adaptation of image segmentation, whi

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f40a41bb7606c64cc4f886f5a70d32bf
http://arxiv.org/abs/1708.07261

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Acoustical breakdown of materials by focusing of laser-generated Rayleigh surface waves

Autor: Istvan A. Veres, Thomas Pezeril, David Veysset, Keith A. Nelson, Steven E. Kooi, Alexey M. Lomonosov, Alexei Maznev

Publikováno v: Veysset, David

Focusing of high-amplitude surface acoustic waves leading to material damage is visualized in an all-optical experiment. The optical setup includes a lens and an axicon that focuses an intense picosecond excitation pulse into a ring-shaped pattern at

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fcb82da40f2714931a496e47fc70a012
http://hdl.handle.net/1721.1/118639

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