Prof. Stuart S.P. Parkin Profile

Prof. Stuart S.P. Parkin

at IBM Research - Almaden

SPIE Involvement:

Author

Proceedings Article | 24 May 2022 Presentation

Ultrafast and nonlinear characterization of Weyl semimetal niobium phosphide thin films

Benjamin Tilmann, Avanindra Pandeya, Gustavo Grinblat, Leonardo de S. Menezes, Yi Li, Chandra Shekhar, Claudia Felser, Stuart S. Parkin, Amilcar Bedoya-Pinto, Stefan Maier

Proceedings Volume PC12131, PC121310E (2022) https://doi.org/10.1117/12.2621215

KEYWORDS: Metalloids, Thin films, Ultrafast phenomena, Niobium, Nanophotonics, Crystals, Refractive index, Nonlinear crystals, Absorption, Visible radiation

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Weyl semimetals are a group of materials with a single touching point of valence and conduction bands and a linear electron dispersion in the adjacent electronic bandstructure, giving rise quasi-massless electrons and topologically protected surface states. However, previous works on Weyl semimetals were largely limited to bulk material and therefore limited in means of flexibility and on-chip device applications. Our work demonstrates first steps towards nanophotonics applications with Weyl semimetals by thoroughly characterizing the linear and nonlinear optical properties of recently realized epitaxial grown thin films of the prototypical Weyl semimetal niobium phosphide (NbP). Despite the dominant absorption over the entire spectrum, pronounced third-harmonic generation could be detected, reaching a maximum efficiency of 10-4 %, being orders of magnitude higher than for common dielectric materials. Furthermore, non-degenerate pump-probe measurements with 10 fs pulses were performed to investigate the ultrafast electronic and optical response of bulk NbP crystal and NbP thin film. For the first, absorption effects and subsequent scattering processes dominate the ultrafast response and show the characteristics of the linear dispersion regime in the electronic bandstructure. On the other hand, the NbP thin films reveal a response that is generated by the nonlinear optical Kerr effect and gives an ultrafast modulation depth of close to 1 % and with a complete relaxation within 100 fs. These findings would allow all-optical switching based on NbP with full-width half maximum bandwidth of 10-20 MHz. Altogether, our results show that the epitaxial grown NbP thin films inherit the optical properties of the bulk crystal and further boost the nonlinear optical interactions. Combined with the possibility of common top-down fabrication techniques enabled by thin films, this paves the way for future applications of nanophotonic devices based on the promising properties of Weyl semimetals.

Proceedings Article | 4 November 2016 Presentation

Probing the spinor nature of electronic states in nanosize non-collinear magnets (Conference Presentation)

Jeison Fischer, Dirk Sander, Stuart Parkin

Proceedings Volume 9931, 993140 (2016) https://doi.org/10.1117/12.2238612

KEYWORDS: Ferromagnetics, Iron, Distortion, Interfaces, Scanning tunneling microscopy, Spintronics, Current controlled current source

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Proceedings Article | 9 October 2012 Paper

Signal propagation in dipole coupled nanomagnets for logic applications

David Carlton, Brian Lambson, Zheng Gu, Scott Dhuey, Li Gao, Brian Hughes, Deirdre Olynick, Charles Rettner, Andreas Scholl, Brian Youngblood, Anthony Young, Ilya Krivorotov, Stuart Parkin, Jeffrey Bokor

Proceedings Volume 8461, 84610W (2012) https://doi.org/10.1117/12.930776

KEYWORDS: Anisotropy, Magnetism, Logic, Crystals, Switching, Clocks, Transistors, Binary data, Nanolithography, Logic devices

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Proceedings Article | 13 August 1992 Paper

Magnetic properties and microstructure in (Fe,Co)/Pt multilayer films

Takao Suzuki, H. Notarys, S. Parkin, S. Iwata, D. Dobbertin

Proceedings Volume 1663, (1992) https://doi.org/10.1117/12.137550

KEYWORDS: Multilayers, Magnetism, Anisotropy, Optical storage, Silicon, X-ray diffraction, Magnetometers, Platinum, Crystals, Optical recording

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Conference Committee Involvement (1)

Oxide-based Materials and Devices

24 January 2010 | San Francisco, California, United States

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