Hans-Benjamin Braun


Research Interests

Condensed matter theory, topology and magnetism, quantum spin models, nanoscale magnetism, stochastic magnetization dynamics, limits of data storage

Biographical sketch

My research interests include topological spin textures in magnetism such as skyrmions, vortices, and domain walls. Such stable spin textures are promising candidates for future information storage and processing. My interests also include quantum spin transport including specific predictions for measuring related hidden correlations in novel neutron scattering or synchrotron x-ray scattering experiments. Recent results include the creation of emergent electric fields created by moving hedgehog spin textures, the purely dynamical stabilization of skyrmions, and monopole-like topological defects in spin  ice systems.


POSITIONS


2016 - 2019 Professor in Theoretical Physics, UCD

2007 - 2016 Associate Professor in Theoretical Physics, UCD

2004 - 2007 Lecturer in Theoretical Physics and Applied Mathematics

2003 - 2004 Visiting Lecturer, Institute for Theoretical Physics, ETH-Zürich, Switzerland

2002 - 2003 Visiting Scientist, Institut Laue-Langevin Grenoble, France and TUM Munich, Germany

2001 - 2001 Visiting Scientist, Courant Institute for Mathematical Sciences, NYU, New York

1996 - 2002 Senior Research Scientist, Paul Scherrer Institut, Villigen, Switzerland

1994 - 1996 NSERC Canada-International Fellow, Simon Fraser University, Vancouver

1993 - 1993 Research Scientist at the Center for Magnetic Recording Research (UCSD), UC San Diego

1992 - 1994 Research Scientist at the Department of Physics, UC San Diego (UCSD)

1987 - 1991 Research Assistant in Theoretical Physics at ETH-Zürich (Switzerland)


AWARD

2014 IEEE Magnetics Society Distinguished Lecturer


PREPRINT

X. Xing, Y. Zhou, and H.B. Braun, Skyrmion Tubes as Magnonic Waveguides, (arXiv :1901.00253).


SELECTED PUBLICATIONS


H.B. Braun, M. Charilaou, and J.F. Löffler, Monopoles and skyrmion structures in cylindrical nanowires, in “Magnetic Nano and Microwires” ed. M. Vazquez, Elsevier, (2019).

M. Charilaou, H.B. Braun, and J. F. Löffler, Monopole-induced emergent electric fields in ferromagnetic nanowires, Phys. Rev. Lett. 121, 097202 (2018).

H.B. Braun, Introductory Chapter, in "Topology in Magnetism", eds: J. Zang, V. Cros and A. Hoffmann, Springer, p. 1-40, ISBN 978-3-319-97334-0, (2018).

H.B. Braun, Topology of static and dynamical spin textures`: skyrmions, vortices and hedgehogs, 25 pages, in “Topological Matter Topological Insulators, Skyrmions, and Majoranas", Forschungszentrum Jülich GmBH (ISBN 978-3-95806-202-3),  (2017).

Y. Liu, N. Lei, W. Zhao, W. Liu, A. Ruotolo, H.B. Braun, and Y. Zhou, Chopping skyrmions from magnetic chiral domains with uniaxial stress in magnetic nanowire, Appl. Phys. Lett 111, 022406 (2017).

Y. Zhou, E. Iacocca, A. Awad, R. K. Dumas, F. C. Zhang, H.B. Braun, and J. Åkerman, Dynamically stabilized magnetic skyrmions, Nature Comm. 6, 8193 (2015), [ISI Highly Cited].

F. Ma, Y. Zhou, H.B. Braun, W.S. Lew, A skyrmion based dynamic magnonic crystal, Nano Lett. 15 4029-4036 (2015).

H.B. Braun, Magnetic Monopoles — Quenching the Fire in Spin Ice, News and Views, Nature Physics 10, 88 (2014).

H.B. Braun, R.V. Hügli, L.J. Heyderman, “Nordpol ohne Sudpol”, Spektrum der Wissenschaft (German Version of ‘Scientific American’), p. 48-57, February 2014.

also reprinted in "Spektrum Spezial — Exotische Materialien", January-March 2014.

H.B. Braun, R.V. Hügli, L.J. Heyderman, “Des aimants qui perdent le nord”, Pour La Science (French Version of ‘Scientific American’), Dossier ‘Les paradoxes de la matière’, p. 34- 41, April-June 2013.

H.B. Braun, “Topological effects in nanomagnetism: from superparamagnetism to chiral quantum solitons”, Advances in Physics 61, 1-116, (2012), [ISI Highly Cited].

R.V. Hügli, G. Duff, B. O’Conchuir, E. Mengotti, A. Fraile Rodríguez, F. Nolting, L.J. Heyderman, and H.B. Braun, “Artificial kagome spin ice dimensional reduction, avalanche control and emergent magnetic monopoles”, Phil. Trans. R. Soc. A 370, 5768-5783 (2012).

E. Mengotti, L.J. Heyderman, A. Fraile Rodriguez, F. Nolting, R.V. Hugli, H.B. Braun, “Real-space observation of emergent magnetic monopoles and associated Dirac strings in artificial kagome spin ice”, Nature Physics 7, 68-74 (2011). [ISI Highly Cited].