M
Mark E. Siemens
Researcher at University of Denver
Publications - 126
Citations - 2603
Mark E. Siemens is an academic researcher from University of Denver. The author has contributed to research in topics: Optical vortex & Vortex. The author has an hindex of 25, co-authored 115 publications receiving 2264 citations. Previous affiliations of Mark E. Siemens include University of Colorado Boulder & National Institute of Standards and Technology.
Papers
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Journal ArticleDOI
Quasi-ballistic thermal transport from nanoscale interfaces observed using ultrafast coherent soft X-ray beams
Mark E. Siemens,Qing Li,Ronggui Yang,Keith A. Nelson,Erik H. Anderson,Margaret M. Murnane,Henry C. Kapteyn +6 more
TL;DR: In this article, the first experimental study of thermal transport at the nanoscale is reported in the case of a point-like heat source, providing a quantitative description of the transition between the ballistic and diffusive regimes.
Journal ArticleDOI
Probing the timescale of the exchange interaction in a ferromagnetic alloy.
Stefan Mathias,Chan La-o-vorakiat,Patrik Grychtol,P. Granitzka,Emrah Turgut,Justin M. Shaw,Roman Adam,Hans T. Nembach,Mark E. Siemens,Steffen Eich,Claus M. Schneider,Thomas J. Silva,Martin Aeschlimann,Margaret M. Murnane,Henry C. Kapteyn +14 more
TL;DR: This work uses extreme ultraviolet pulses from high-harmonic generation as an element-specific probe of ultrafast, optically driven, demagnetization in a ferromagnetic Fe-Ni alloy (permalloy), and shows that for times shorter than the characteristic timescale for exchange coupling, the magnetization of Fe quenches more strongly than that of Ni.
Journal ArticleDOI
Ultrafast Demagnetization Dynamics at the M Edges of Magnetic Elements Observed Using a Tabletop High-Harmonic Soft X-Ray Source
Chan La-o-vorakiat,Mark E. Siemens,Margaret M. Murnane,Henry C. Kapteyn,Stefan Mathias,Martin Aeschlimann,Patrik Grychtol,Roman Adam,Claus M. Schneider,Justin M. Shaw,Hans T. Nembach,Thomas J. Silva +11 more
TL;DR: The use of high harmonics for probing magnetic materials promises to combine nanometer spatial resolution, elemental specificity, and femtosecond-to-attosecond time resolution, making it possible to address important fundamental questions in magnetism.
Journal Article
Probing the timescale of the exchange interaction in a ferromagnetic alloy
Emrah Turgut,Chan La-o-vorakiat,Mark E. Siemens,Margaret M. Murnane,Henry C. Kapteyn,Stefan Mathias,P. Granitzka,Steffen Eich,Martin Aeschlimann,Patrik Grychtol,Roman Adam,Claus M. Schneider,Justin M. Shaw,Hans T. Nembach,Thomas J. Silva +14 more
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Resonance lineshapes in two-dimensional Fourier transform spectroscopy
TL;DR: An analytical form for resonance lineshapes in two-dimensional (2D) Fourier transform spectroscopy is derived from the solution of the optical Bloch equations for a two-level system in the 2D time domain.