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1,424 results on '"Kapteyn, Henry"'

204. Direct light-induced spin transfer between different elements in a spintronic Heusler material via femtosecond laser excitation

Author

Tengdin, Phoebe, Gentry, Christian, Blonsky, Adam, Zusin, Dmitriy, Gerrity, Michael, Hellbrück, Lukas, Hofherr, Moritz, Shaw, Justin, Kvashnin, Yaroslav, Delczeg-Czirjak, Erna Krisztina, Arora, Monika, Nembach, Hans, Silva, Tom J., Mathias, Stefan, Aeschlimann, Martin, Kapteyn, Henry C., Thonig, Danny, Koumpouras, Konstantinos, Eriksson, Olle, Murnane, Margaret M., Tengdin, Phoebe, Gentry, Christian, Blonsky, Adam, Zusin, Dmitriy, Gerrity, Michael, Hellbrück, Lukas, Hofherr, Moritz, Shaw, Justin, Kvashnin, Yaroslav, Delczeg-Czirjak, Erna Krisztina, Arora, Monika, Nembach, Hans, Silva, Tom J., Mathias, Stefan, Aeschlimann, Martin, Kapteyn, Henry C., Thonig, Danny, Koumpouras, Konstantinos, Eriksson, Olle, and Murnane, Margaret M.

Abstract

Heusler compounds are exciting materials for future spintronics applications because they display a wide range of tunable electronic and magnetic interactions. Here, we use a femtosecond laser to directly transfer spin polarization from one element to another in a half-metallic Heusler material, Co2MnGe. This spin transfer initiates as soon as light is incident on the material, demonstrating spatial transfer of angular momentum between neighboring atomic sites on time scales < 10 fs. Using ultrafast high harmonic pulses to simultaneously and independently probe the magnetic state of two elements during laser excitation, we find that the magnetization of Co is enhanced, while that of Mn rapidly quenches. Density functional theory calculations show that the optical excitation directly transfers spin from one magnetic sublattice to another through preferred spin-polarized excitation pathways. This direct manipulation of spins via light provides a path toward spintronic devices that can operate on few-femtosecond or faster time scales.

Published
2020
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205. Nanosession: Spin Dynamics

Author

Kákay, Attila, primary, Yan, Ming, additional, Andreas, Christian, additional, García-Sánchez, Felipe, additional, Hertel, Riccardo, additional, Bürgler, Daniel E., additional, Sluka, Volker, additional, Deac, Alina, additional, Kakay, Attila, additional, Schneider, Claus M., additional, Althammer, Matthias, additional, Weiler, Mathias, additional, Czeschka, Franz D., additional, Lotze, Johannes, additional, Woltersdorf, Georg, additional, Schreier, Michael, additional, Gepraegs, Stephan, additional, Huebl, Hans, additional, Opel, Matthias, additional, Gross, Rudolf, additional, Goennenwein, Sebastian T. B., additional, Adam, Roman, additional, Rudolf, Dennis, additional, Bauer, Alexander, additional, Weier, Christian, additional, Plötzing, Moritz, additional, Grychtol, Patrik, additional, La-O-Vorakiat, Chan, additional, Turgut, Emrah, additional, Kapteyn, Henry C., additional, Murnane, Margaret M., additional, Shaw, Justin M., additional, Nembach, Hans T., additional, Silva, Thomas J., additional, Mathias, Stefan, additional, Aeschlimannand, Martin, additional, Popova, Daria, additional, Bringer, Andreas, additional, Blügel, Stefan, additional, Long, N. H., additional, Mavropoulos, Ph., additional, Heers, S., additional, Zimmermann, B., additional, Mokrousov, Y., additional, and Blügel, S., additional

Published
2013
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206. Phase-matching techniques for coherent soft x-ray generation

Author

Paul, Ariel, Gibson, Emily A., Christov, Ivan P., Xiaoshi Zhang, Murnane, Margaret M., Lytle, Amy, Xibin Zhou, Popmintchev, Tenio, and Kapteyn, Henry C.

Subjects
Coherent states -- Research, Optical waveguides -- Design and construction, Optics -- Research, Business, Computers, Electronics, Electronics and electrical industries
Abstract

Extreme nonlinear optics obtained by focusing an intense laser into a gas can be used to generate coherent beams at soft X-ray (SXR) wavelengths. Phase-matching and quasi-phase-matching techniques that use gas-filled modulated waveguides to enhance the frequency conversion process leads to the generation of SXR beams that are both spatially and temporally coherent.

Published
2006

208. Introduction to imec's AttoLab for ultrafast kinetics of EUV exposure processes and ultra-small pitch lithography

Author

Holzmeier, Fabian, primary, Dorney, Kevin, additional, Larsen, Esben W., additional, Nuytten, Thomas, additional, Singh, Dhirendra P., additional, van Setten, Michiel, additional, Vanelderen, Pieter, additional, Bargsten, Clayton, additional, Cousin, Seth L., additional, Raymondson, Daisy, additional, Rinard, Eric, additional, Ward, Rod, additional, Kapteyn, Henry, additional, Böttcher, Stefan, additional, Dyachenko, Oleksiy, additional, Kremzow, Raimund, additional, Wietstruk, Marko, additional, Pourtois, Geoffrey, additional, van der Heide, Paul, additional, and Petersen, John, additional

Published
2021
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212. Maximizing the Field of View in Blind Ptychography

Author

Jenkins, Nicholas W., primary, Tanksalvala, Michael, additional, Esashi, Yuka, additional, Zhang, Zhe, additional, Bevis, Charles S., additional, Jacobs, Matthew N., additional, Johnsen, Peter, additional, Liao, Chen-Ting, additional, Gerrity, Michael, additional, Kapteyn, Henry C., additional, and Murnane, Margaret M., additional

Published
2021
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221. Ultrafast 1 MHz vacuum-ultraviolet source via highly cascaded harmonic generation in negative-curvature hollow-core fibers

Author

Couch, David E., primary, Hickstein, Daniel D., additional, Winters, David G., additional, Backus, Sterling J., additional, Kirchner, Matthew S., additional, Domingue, Scott R., additional, Ramirez, Jessica J., additional, Durfee, Charles G., additional, Murnane, Margaret M., additional, and Kapteyn, Henry C., additional

Published
2020
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222. Nondestructive Measurements of the Mechanical and Structural Properties of Nanostructured Metalattices

Author

Abad, Begoña, primary, Knobloch, Joshua L., additional, Frazer, Travis D., additional, Hernández-Charpak, Jorge N., additional, Cheng, Hiu Y., additional, Grede, Alex J., additional, Giebink, Noel C., additional, Mallouk, Thomas E., additional, Mahale, Pratibha, additional, Nova, Nabila N., additional, Tomaschke, Andrew A., additional, Ferguson, Virginia L., additional, Crespi, Vincent H., additional, Gopalan, Venkatraman, additional, Kapteyn, Henry C., additional, Badding, John V., additional, and Murnane, Margaret M., additional

Published
2020
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223. Direct light–induced spin transfer between different elements in a spintronic Heusler material via femtosecond laser excitation

Author

Tengdin, Phoebe, primary, Gentry, Christian, additional, Blonsky, Adam, additional, Zusin, Dmitriy, additional, Gerrity, Michael, additional, Hellbrück, Lukas, additional, Hofherr, Moritz, additional, Shaw, Justin, additional, Kvashnin, Yaroslav, additional, Delczeg-Czirjak, Erna K., additional, Arora, Monika, additional, Nembach, Hans, additional, Silva, Tom J., additional, Mathias, Stefan, additional, Aeschlimann, Martin, additional, Kapteyn, Henry C., additional, Thonig, Danny, additional, Koumpouras, Konstantinos, additional, Eriksson, Olle, additional, and Murnane, Margaret M., additional

Published
2020
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227. Laser-Enabled Control of Interatomic-Coulomb-Decay Dynamics

Author

Hogle, Craig W., primary, Martin, Leigh, additional, Tong, Xiao-Min, additional, Ueda, Kiyoshi, additional, Miteva, Tsveta, additional, Cederbaum, Lorenz S., additional, Kapteyn, Henry C., additional, Murnane, Margaret M., additional, and Ranitovic, Predrag, additional

Published
2020
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228. Coherent electron-phonon couplings in a charge density wave material

Author

Zhang, Yingchao, primary, Shi, Xun, additional, You, Wenjing, additional, Tao, Zhensheng, additional, Zhong, Yigui, additional, Kabeer, Fairoja Cheenicode, additional, Maldonado, Pablo, additional, Oppeneer, Peter M., additional, Bauer, Michael, additional, Rossnagel, Kai, additional, Kapteyn, Henry, additional, and Murnane, Margaret, additional

Published
2020
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229. Light-induced manipulation of the charge density wave in 1T-TaSe2

Author

Shi, Xun, primary, You, Wenjing, additional, Zhang, Yingchao, additional, Tao, Zhensheng, additional, Zhong, Yigui, additional, Oppeneer, Peter M., additional, Wu, Xianxin, additional, Thomale, Ronny, additional, Rossnagel, Kai, additional, Bauer, Michael, additional, Kapteyn, Henry, additional, and Murnane, Margaret, additional

Published
2020
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237. Laser-Assisted Photoelectric Effect on Pt(111)

Author

Miaja-Avila, Luis, primary, Saathoff, Guido, additional, Lei, Chifong, additional, Aeschlimann, Martin, additional, Gland, John L., additional, Murnane, Margaret M., additional, and Kapteyn, Henry C., additional

Published
2007
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241. Light with a self-torque: extreme-ultraviolet beams with time-varying orbital angular momentum

Author

Rego, Laura, Dorney, Kevin M., Brooks, Nathan J., Nguyen, Quynh, Liao, Chen-Ting, Román, Julio San, Couch, David E., Liu, Allison, Pisanty, Emilio, Lewenstein, Maciej, Plaja, Luis, Kapteyn, Henry C., Murnane, Margaret M., and Hernández-García, Carlos

Subjects
Physics::Optics, FOS: Physical sciences, Physics - Optics, Optics (physics.optics)
Abstract

Twisted light fields carrying orbital angular momentum (OAM) provide powerful capabilities for applications in optical communications, microscopy, quantum optics and microparticle rotation. Here we introduce and experimentally validate a new class of light beams, whose unique property is associated with a temporal OAM variation along a pulse: the self-torque of light. Self-torque is a phenomenon that can arise from matter-field interactions in electrodynamics and general relativity, but to date, there has been no optical analog. In particular, the self-torque of light is an inherent property, which is distinguished from the mechanical torque exerted by OAM beams when interacting with physical systems. We demonstrate that self-torqued beams in the extreme-ultraviolet (EUV) naturally arise as a necessary consequence of angular momentum conservation in non-perturbative high-order harmonic generation when driven by time-delayed pulses with different OAM. In addition, the time-dependent OAM naturally induces an azimuthal frequency chirp, which provides a signature for monitoring the self-torque of high-harmonic EUV beams. Such self-torqued EUV beams can serve as unique tools for imaging magnetic and topological excitations, for launching selective excitation of quantum matter, and for manipulating molecules and nanostructures on unprecedented time and length scales., Comment: 24 pages, 4 figures

Published
2019
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245. Fully spatially coherent EUV source

Author

Bartels, Randy A., primary, Backus, Sterling, additional, Paul, Ariel, additional, Kapteyn, Henry, additional, Murnane, Margaret, additional, Liu, Yanwei, additional, Attwood, David, additional, and Jacobsen, Chris, additional

Published
2003
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248. Coherent Control of XUV Radiation

Author

Bartels, Randy, primary, Backus, Sterling, additional, Christov, Ivan, additional, Misoguti, Lino, additional, Vdovin, Gleb, additional, Zeek, Erik, additional, Murnane, Margaret M., additional, and Kapteyn, Henry C., additional

Published
2001
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249. The nature of the ultrafast magnetic phase transition in nickel revealed by correlating EUV-MOKE and ARPES spectroscopies

Author

Tao, Zhensheng, You, Wenjing, Tengdin, Phoebe, Chen, Cong, Shi, Xun, Zusin, Dmitriy, Zhang, Yingchao, Gentry, Christian, Blonsky, Adam, Keller, Mark, Oppeneer, Peter. M., Kapteyn, Henry, Murnane, Margaret, Tao, Zhensheng, You, Wenjing, Tengdin, Phoebe, Chen, Cong, Shi, Xun, Zusin, Dmitriy, Zhang, Yingchao, Gentry, Christian, Blonsky, Adam, Keller, Mark, Oppeneer, Peter. M., Kapteyn, Henry, and Murnane, Margaret

Abstract

By correlating time- and angle-resolved photoemission (Tr-ARPES) and time-resolved transverse- magneto-optical Kerr effect (Tr-TMOKE) measurements, both at extreme ultraviolet (EUV) wavelengths, we uncover the nature of the ultrafast photoinduced magnetic phase transition in Ni. This allows us to explain the ultrafast magnetic response of Ni at all laser fluences - from a small reduction of the magnetization at low laser fluences, to complete quenching at high laser fluences. We provide an alternative explanation to the fluence-dependent recovery timescales commonly observed in ultrafast magneto-optical spectroscopies on ferromagnets: it is due to the bulk-averaging effect and different depths of sample exhibit distinct dynamics, depending on whether a magnetic phase transition is induced. We also show evidence of two competing channels with two distinct timescales in the recovery process, that suggest the presence of coexisting phases in the material.

Published
2019
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250. Ultrafast electron calorimetry uncovers a new long-lived metastable state in 1T-TaSe2 mediated by mode-selective electron-phonon coupling

Author

Shi, Xun, You, Wenjing, Zhang, Yingchao, Tao, Zhensheng, Oppeneer, Peter M., Wu, Xianxin, Thomale, Ronny, Rossnagel, Kai, Bauer, Michael, Kapteyn, Henry, Murnane, Margaret, Shi, Xun, You, Wenjing, Zhang, Yingchao, Tao, Zhensheng, Oppeneer, Peter M., Wu, Xianxin, Thomale, Ronny, Rossnagel, Kai, Bauer, Michael, Kapteyn, Henry, and Murnane, Margaret

Abstract

Quantum materials represent one of the most promising frontiers in the quest for faster, lightweight, energy-efficient technologies. However, their inherent complexity and rich phase landscape make them challenging to understand or manipulate. Here, we present a new ultrafast electron calorimetry technique that can systematically uncover new phases of quantum matter. Using time- and angle-resolved photoemission spectroscopy, we measure the dynamic electron temperature, band structure, and heat capacity. This approach allows us to uncover a new long-lived metastable state in the charge density wave material 1T-TaSe2, which is distinct from all the known equilibrium phases: It is characterized by a substantially reduced effective total heat capacity that is only 30% of the normal value, because of selective electron-phonon coupling to a subset of phonon modes. As a result, less energy is required to melt the charge order and transform the state of the material than under thermal equilibrium conditions.

Published
2019
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