Dr. Ryan B. Lewis

Profile

Academic positionLecturer, Assistant Professor, Researcher
Research fieldsSemiconductor Physics
KeywordsNanowires, Molecular beam epitaxy, Gallium arsenide, Bismuth

Current contact address

CountryCanada
CityHamilton
InstitutionMcMaster University
InstituteDepartment of Engineering Physics
Homepagehttps://www.eng.mcmaster.ca/engphys/people/faculty/ryan-lewis

Host during sponsorship

Prof. Dr. Henning RiechertPaul-Drude-Institut für Festkörperelektronik (PDI), Berlin
Start of initial sponsorship01/03/2016

Programme(s)

2015Humboldt Research Fellowship Programme for Postdocs

Publications (partial selection)

2019Pierre Corfdir, Oliver Marquardt, Ryan B Lewis, Chiara Sinito, Manfred Ramsteiner, Achim Trampert, Uwe Jahn, Lutz Geelhaar, Oliver Brandt, Vladimir M Fomin: Excitonic Aharonov–Bohm Oscillations in Core–Shell Nanowires. In: Advanced Materials, 2019, 1805645
2018Ali Al Hassan, Arman Davtyan, Hanno Küpers, Ryan B Lewis, Danial Bahrami, Florian Bertram, Genziana Bussone, Carsten Richter, Lutz Geelhaar, Ullrich Pietsch: Complete structural and strain analysis of single GaAs/(In, Ga) As/GaAs core–shell–shell nanowires by means of in-plane and out-of-plane X-ray nanodiffraction. In: Journal of Applied Crystallography, 2018, 1387-1395
2018A. Al Hassan, R. B. Lewis, H. Küpers, W. -H. Lin, D. Bahrami, T. Krause, D. Salomon, A. Tahraoui, M. Hanke, L. Geelhaar and U. Pietsch: Determination of Indium content of GaAs/(In,Ga)As/(GaAs) core-shell(-shell) nanowires by x-ray diffraction and nano x-ray fluorescence. In: Physical Review Materials, 2018, 014604
2018Hanno Küpers, Ryan B Lewis, Abbes Tahraoui, Mathias Matalla, Olaf Krüger, Faebian Bastiman, Henning Riechert, Lutz Geelhaar: Diameter evolution of selective area grown Ga-assisted GaAs nanowires. In: Nano Research, 2018, 2885-2893
2018R. B. Lewis, P. Corfdir, H. Küpers, T. Flissikowski, O. Brandt, and L. Geelhaar: Nanowires bending over backward from strain partitioning in asymmetric core–shell heterostructures. In: Nano Letters, 2018, 2343-2350
2018Ludwig Hüttenhofer, Dionysios Xydias, Ryan B Lewis, Sander Rauwerdink, Abbes Tahraoui, Hanno Küpers, Lutz Geelhaar, Oliver Marquardt, Stefan Ludwig: Optimization of Ohmic Contacts to -Type Nanowires. In: Physical Review Applied, 2018, 034024
2017R. B. Lewis, L. Nicolai, H. Küpers, M. Ramsteiner, A. Trampert and L. Geelhaar: Anomalous strain relaxation in core-shell nanowire heterostructures via simultaneous coherent and incoherent growth. In: Nano Letters, 2017, 136-142
2017Wan-Hsien Lin, Uwe Jahn, Hanno Küpers, Esperanza Luna, Ryan B Lewis, Lutz Geelhaar, Oliver Brandt: Efficient methodology to correlate structural with optical properties of GaAs nanowires based on scanning electron microscopy. In: Nanotechnology, 2017, 415703
2017Pierre Corfdir, Ryan B Lewis, Lutz Geelhaar, Oliver Brandt: Fine structure of excitons in InAs quantum dots on GaAs (110) planar layers and nanowire facets. In: Physical Review B, 2017, 045435
2017Ryan B. Lewis, Pierre Corfdir, Hong Li, Jesús Herranz, Carsten Pfüller, Oliver Brandt, Lutz Geelhaar: Quantum dot self-assembly driven by a surfactant-induced morphological instability. In: Physical Review Letters, 2017, 086101
2017Ryan B Lewis, Pierre Corfdir, Jesús Herranz, Hanno Küpers, Uwe Jahn, Oliver Brandt, Lutz Geelhaar: Self-assembly of InAs nanostructures on the sidewalls of GaAs nanowires directed by a Bi surfactant. In: Nano Letters, 2017, 4255-4260
2017Hanno Küpers, Abbes Tahraoui, Ryan B Lewis, Sander Rauwerdink, Mathias Matalla, Olaf Krüger, Faebian Bastiman, Henning Riechert, Lutz Geelhaar: Surface preparation and patterning by nano imprint lithography for the selective area growth of GaAs nanowires on Si (111). In: Semiconductor Science and Technology, 2017, 115003
2017Arman Davtyan, Thilo Krause, Dominik Kriegner, Ali Al-Hassan, Danial Bahrami, SM Mostafavi Kashani, Ryan B Lewis, Hanno Küpers, Abbes Tahraoui, Lutz Geelhaar, Michael Hanke, Steven John Leake, Otmar Loffeld, Ullrich Pietsch: Threefold rotational symmetry in hexagonally shaped core–shell (In, Ga) As/GaAs nanowires revealed by coherent X-ray diffraction imaging. In: Journal of Applied Crystallography, 2017, 673-680
2016P. Corfdir, H. Küpers, R. B. Lewis, T. Flissikowski, H. T. Grahn, L. Geelhaar and O. Brandt: Exciton dynamics in GaAs/(Al, Ga) As core-shell nanowires with shell quantum dots. In: Physical Review B, 2016, 155413
2016P. Corfdir, R. B. Lewis, O. Marquardt, H. Küpers, J. Grandal, E. Dimakis, A. Trampert, L. Geelhaar, O. Brandt, and R. T. Phillips: Exciton recombination at crystal-phase quantum rings in GaAs/InxGa1−xAs core/multishell nanowires. In: Applied Physics Letters, 2016, 082107