K
Keith A. Nelson
Researcher at Massachusetts Institute of Technology
Publications - 750
Citations - 30478
Keith A. Nelson is an academic researcher from Massachusetts Institute of Technology. The author has contributed to research in topics: Terahertz radiation & Femtosecond. The author has an hindex of 85, co-authored 727 publications receiving 26755 citations. Previous affiliations of Keith A. Nelson include Harvard University & Philips.
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Journal ArticleDOI
Persistent exciton-type many-body interactions in GaAs quantum wells measured using two-dimensional optical spectroscopy
Daniel B. Turner,Patrick Y. Wen,Dylan H. Arias,Keith A. Nelson,Hebin Li,Galan Moody,Mark E. Siemens,Steven T. Cundiff +7 more
TL;DR: In this paper, the authors measured 2D spectra of GaAs quantum wells at many different ''waiting'' times and studied the time dependence of the spectral features, showing that many-body interactions among semiconductor excitons can produce distinct features in two-dimensional optical spectra.
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Nanoscale transient gratings excited and probed by extreme ultraviolet femtosecond pulses.
Filippo Bencivenga,R. Mincigrucci,Flavio Capotondi,Laura Foglia,Denys Naumenko,Alexei Maznev,Emanuele Pedersoli,A. Simoncig,F. Caporaletti,Vazrik Chiloyan,R. Cucini,F. Dallari,R. A. Duncan,Travis Frazer,Giulio Gaio,Alessandro Gessini,Luca Giannessi,Samuel Huberman,Henry C. Kapteyn,Joshua Knobloch,G. Kurdi,Nicola Mahne,Nicola Mahne,Michele Manfredda,Anna Martinelli,Margaret M. Murnane,Emiliano Principi,Lorenzo Raimondi,Simone Spampinati,Carlo Spezzani,M. Trovo,Marco Zangrando,Marco Zangrando,Gang Chen,Giulio Monaco,Keith A. Nelson,Claudio Masciovecchio +36 more
TL;DR: EUV transient grating spectroscopy is described, in which two crossed femtosecond EUV pulses produce spatially periodic nanoscale excitations in the sample and their dynamics is probed via diffraction of a third time-delayed EUV pulse.
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A direct test of the correlation between elastic parameters and fragility of ten glass formers and their relationship to elastic models of the glass transition
TL;DR: The results lend credence to the notion that the dynamics of the glass transition are governed by the evolution of the shear modulus but do not suggest a strong correlation between the fragility index and the ratio of instantaneous elastic moduli.
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Real-space polariton wave packet imaging
TL;DR: In this article, the propagation of collective lattice vibrational wave packets that move at light-like speeds through their crystalline hosts has been monitored through a real-space imaging method based on Fresnel diffraction and phase-contrast microscopy.
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Second-order elastic constants of pentaerythritol tetranitrate and cyclotrimethylene trinitramine using impulsive stimulated thermal scattering
Baozhou Sun,J. M. Winey,N. Hemmi,Zbigniew A. Dreger,K. A. Zimmerman,Yogendra M. Gupta,Darius H. Torchinsky,Keith A. Nelson +7 more
TL;DR: In this paper, the second-order elastic constants for Pentaerythritol tetranitrate (PETN) and cyclotrimethylene trinitramine (RDX) single crystals were determined using an optical heterodyne detection approach.