Dr. Prosper Ngabonziza

Phone: +49 (0)711 689-1312
E-Mail: p.ngabonziza [at] fkf.mpg.de




Prosper Ngabonziza did undergraduate studies in Physics at University of Rwanda (former National University of Rwanda). He completed with cum laude, in 2010, a postgraduate diploma in mathematical sciences at African Institute for Mathematical Sciences (AIMS), under the University of Cape Town in South Africa; and in 2012 a Master’s degree with cum laude in experimental physics from University of Johannesburg. He received in 2013 the S2A3 Bronze Medal awarded by the Southern Africa association for advancement of science to the best student who did a most meritorious master dissertation in a science department in South Africa. In 2016, he completed a PhD in engineering physics from University of Twente in The Netherlands, under the supervision of Prof. Alexander Brinkman and Prof. Hans Hilgenkamp. His PhD project was on topological insulators (TIs). He was combining thin film growth, characterizations and quantum transport study of TIs; in particular nanoscale electronics in superconductor-topological insulator Josephson junction devices (Nb-Bi2Te3-Nb). 

Currently, he works at the Max Planck Institute for Solid State Research in Stuttgart, in the department of solid-state quantum electronics of Prof. Jochen Mannhart. His research at Max Planck focuses on quantum matter heterostructures fabricated from complex oxides with the goal to explore novel phenomena in devices fabricated from such heterostructures. For example; we demonstrated recently the first application of two-dimensional doping to ion conductors, specifically to perovskite proton conductor BaZrO3–based heterostructures. Thereafter, we integrated these heterostructures into tunnel junction devices; and for the very first time, using inelastic electron tunneling spectroscopy (IETS), we have demonstrated electron tunneling at high-temperatures in planar tunnel junction devices. More details on these projects are here.

Also, he is actively involved in the The African Light Source (AfLS) project, as the Deputy Chair of the Executive Committee of the African light source foundation. AfLS project is working towards building a synchrotron light source on the African continent that will contribute significantly to the African science renaissance. For details on this project, see AfLS foundation website and the upcoming event website.

In June 2019, he has been nominated as a Fellow to the Rwanda Academy of Science.

Furthermore he has been selected for a membership in the Global Young Academy for a period of 5 years beginning in June 2020, based on his distinguished qualifications and commitment to service to society.

Currently, he is serving on the 2021/2022 Global Young Academy Executive Committee.


Online Blog article

The need for multidisciplinary scientific infrastructures in Africa: The importance of an African Lightsource
P. Ngabonziza
Elephant in the Lab (2019)



Key Publications

Electronic structure and magnetism of the triple-layered ruthenate Sr4Ru3O10
G. Gebreyesus, P. Ngabonziza,  J. Nagura, N. Seriani, O. Akin-Ojo, and R.M. Martin
Physical Review B 105, 165119 (2022)
DOI: https://doi.org/10.1103/PhysRevB.105.165119  

Quantum Transport and Potential of Topological States for Thermoelectricity in Bi2Te3 Thin Films
P. Ngabonziza
Nanotechnology 33, 192001 (2022)

Inelastic Electron Tunneling Spectroscopy at High-Temperatures

P. Ngabonziza, Y. Wang, P. A. van Aken, J. Maier, and J. Mannhart

Advances Materials 2007299 (2021)

2D Doping of Proton Conductors: BaZrO3-Based Heterostructures
P. Ngabonziza, R. Merkle, Y. Wang, P. van Aken, T.S. Bjorheim, J. Maier, and J. Mannhart
Adv. Energy Mater. 2003267 (2020)

Fermi Surface and Kink Structures in Sr4Ru3O10 Revealed by Synchrotron-Based ARPES

P. Ngabonziza, E. Carleschi, V. Zabolotnyy, A. Taleb-Ibrahimi, F. Bertran, R. Fittipaldi, V. Granata, M. Cuoco, A. Vecchione, and B.P. Doyle

Scientific Reports 10, 21062 (2020)

arxiv: 2005.05233

In situ Thermal Preparation of Oxide Surfaces

W. Braun, M. Jäger, G. Laskin, P. Ngabonziza, W. Voesch, P. Wittlich, and J. Mannhart
APL Materials 8, 071112 (2020)
published online July 16, 2020

DOI: 10.1063/5.0008324

Josephson Effect and Charge Distribution in Thin Bi2Te3 Topological Insulators
M.P. Stehno, P. Ngabonziza, H. Myoren, and A. Brinkman
Advanced Materials, published online Feb 24, 2020
DOI: 10.1002/adma.201908351
ArXiv: 1912.09757 (20.12.2019)

Towards an African Light Source

S.H. Connell, S.K. Mtingwa, T. Dobbins, N. Khumbah, B. Masara, E.P. Mitchell, L. Norris, P. Ngabonziza, T. Ntsoane, and H. Winick

Biophysical Reviews, published online 12 July 2019

DOI: 10.1007/s12551-019-00578-3

High-temperature-grown buffer layer boosts electron mobility in epitaxial La-doped BaSnO3/SrZrO3 heterostructures
Arnaud. P. Nono Tchiomo, Wolfgang Braun, Bryan P. Doyle, Wilfried Sigle, Peter van Aken, Jochen Mannhart, and Prosper Ngabonziza
APL Materials 7, 041119 (2019) 

The African Light Source Project
S. H. Connell, S.K. Mtingwa, T. Dobbins, B. Masara, E.P. Mitchell, L. Norris, P. Ngabonziza, T. Ntsoane, M. Sekota, A. Wague, H. Winick, and M. Yousef
The African Review of Physics 13, 0019 (2018)

Surface Characterization of Clean SrTiO3 (100) Substrates by X-ray Photoelectron Spectroscopy
P. Nono Tchiomo, G. Babu-Geetha, E. Carleschi, P. Ngabonziza, and B. P. Doyle
Surface Science Spectra 25, 024001-1-13 (2018) 

Bulk contribution to magnetotransport properties of low-defect-density Bi2Te3 topological insulator thin films
P. Ngabonziza, Y.Wang, and A. Brinkman
Physical Review Material 2, 044204 (2018) 

In-situ characterization tools for Bi2Te3 topological insulator nanomaterials
P. Ngabonziza, M. P. Stehno, G. Koster, and A. Brinkman
Book chapter in the Springer book series on "In-situ Characterization Techniques for Nanomaterials". Kumar C. (eds); Springer, Berlin, Heidelberg (2018) 

Gate-tunable transport properties of in-situ capped Bi2Te3 topological insulator thin films
P. Ngabonziza, M. P. Stehno, H. Myoren, V. A. Neumann, G. Koster, and A. Brinkman
Advanced Electronic Material 2, 1600157 (2016) 

In-situ spectroscopy of intrinsic Bi2Te3 topological insulator thin films and impact of extrinsic defects
P. Ngabonziza, R. Heimbuch, N. de Jong, R. A. Klaassen, M. P. Stehno, M. Snelder, A. Solmaz, S. V. Ramankutty, E. Frantzeskakis, E. van Heumen, G. Koster, M. S. Golden, H. J.W. Zandvliet, and A. Brinkman
Physical Review B 92, 035405 (2015) 

Magnetoresistance From Broken Spin Helicity
D.P. Leusink, R.G.J. Smits, P. Ngabonziza, X.L. Wang, S. Wiedmann, U. Zeitler, and A. Brinkman
arXiv:1412.4065 (2014) 

Signature of electron-phonon correlation in the band structure of Sr4Ru3O10
P. Ngabonziza, E. Carleschi and B.P. Doyle
Proceeding of the South African Institute for Physics, (2012) ISBN: 978-1-77592-070-0), 153-157 (2014)

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