News

In September 2022, a team around M. Kläui organized the International Workshop on Topological Structures TOPO 2022 at the Institute of Molecular Biology at the University of Mainz. This workshop is the 7^th installment of the TOPO conference series focusing on topological solitons, topological spin structures, topological textures in antiferromagnets and ferroelectrics, as well as excitations in these systems.                                                            Despite the travel challenges of the still ongoing COVID-19 pandemic, we were able to attract contributions from leading experts in the field from around the world joining the workshop large in person. The high number of up to 70 on-site participants fostered intense discussion between all participants of the workshop and made the workshop a lively and successful event. 

JGU physicists discovered that canted antiferromagnets are suitable for transporting spin waves over long distances. This offers a whole new class of materials, which allow for magnon transport in insulating system. These materials have the potential to significantly increase computing speed compared to existing devices and at the same time greatly reduce waste heat.

Publication:

S. Das et al., Anisotropic long-range spin transport in canted antiferromagnetic orthoferrite YFeO₃, Nature Communications 13: 6140, 17. Oktober 2022,
DOI: 10.1038/s41467-022-33520-5

Additional information:

https://www.uni-mainz.de/presse/aktuell/16622_DEU_HTML.php

Publication:

J. Rodriguez-Nieva, A. Piñeiro-Orioli, J. Marino,Far-from-equilibrium universality in the two-dimensionalHeisenberg model, PNAS (2022) 119, 28

Additional information:

https://www.uni-mainz.de/presse/aktuell/15662_DEU_HTML.php

Publication:

R. Gruber et al., Skyrmion pinning energetics in thin film systems, Nature Communications 13, 3144, 6. Juni 2022, DOI: 10.1038/s41467-022-30743-4

 

 

Publication:

Riccardo J. Valencia-Tortora, Nicola Pancotti, and Jamir Marino, PRX Quantum 3, 020346 (2022)

https://journals.aps.org/prxquantum/abstract/10.1103/PRXQuantum.3.020346

 

We welcome Iryna Kononenko from the National Academy of Sciences of Ukraine, Sumy, Ukraine. She will join us for work on thin film materials exploration. We are looking forward to a successful collaboration.

March, 24th and 25th, 2022

Johannes Gutenberg-University Mainz

Institute of Physics
Staudinger Weg 7, Room 03-431
55128 Mainz

Contact: Robert Frömter - rfroemte@uni-mainz.de

Additional Information: TOPOCOM | Dynamics and Topology (uni-mainz.de)

Merging spintronics and quantum thermodynamics to harvest ambient thermal energy

Dr Martin Bowen

French National Centre for Scientific Research | CNRS
Institute of Physics and Chemistry of Materials at Strasbourg (IPCMS)

I will present a novel concept that blends spintronics and quantum thermodynamics to generate
electricity. This concept is invoked to explain our experimental observations of electrical generation
across oxide [1] and molecular spintronic devices [2] that comprise paramagnetic centers
sandwiched between electrodes with full transport spin polarization. The presence of so-called
quantum resources [3,4], leading to a source of work of quantum origin called ergotropy, appears [2] to be manifest in sub-kBT spectral features, as well in an apparent signature of a phase transition of
the spin fluctuations on the paramagnetic centers. I will discuss our present research tracks to better
understand this spintronic quantum engine. General info may also be found at
http://www.spinengine.tech.

References:
[1] Katcko, K. et al. Spin-driven electrical power generation at room temperature, Commun. Physics 2,
116 (2019).
[2] Chowrira, B., Kandpal, L. & et al. Quantum advantage in a spintronic engine with coherently
coupled ultrafast strokes using molecular superexchange, arXiv:2009.10413.
[3] Bresque, L. et al. Two-Qubit Engine Fueled by Entanglement and Local Measurements, Phys. Rev.
Lett. 126, 120605 (2021).
[4] Klatzow, J. et al. Experimental Demonstration of Quantum Effects in the Operation of Microscopic
Heat Engines, Phys. Rev. Lett. 122, 110601 (2019).

If you are interested to join this seminar talk, please contact the TopDyn team (topdyn@unimainz.de) for the zoom link.

 

New ATIQ project with funding from the German Federal Ministry of Education and Research has a total volume of EUR 44.5 million (December, 2021)

Quantum computers promise unprecedented computing power for applications where conventional data processors based on "zeros and ones" fail. In the new Trapped-Ion Quantum Computer for Applications project, 25 partners from research institutions are now working together with industrial partners to develop quantum computer demonstrators implemented together with users of quantum computers. The partners will tackle major technical challenges to realize quantum computer demonstrators made in Germany and to facilitate 24/7 access for users.

Additional information: https://www.uni-mainz.de/presse/aktuell/14778_ENG_HTML.php

Contact: Professor Dr. Ferdinand Schmidt-Kaler, Quantenbit group, QUANTUM, Institute of Physics, JGU

The ATIQ project is an extension of the IQuAn project.

Demonstration of technologically feasible read-out for ultrafast and stable magnetic memory (November, 2021)

Additional information:

https://www.uni-mainz.de/presse/aktuell/14647_ENG_HTML.php

Publication:

S. P. Bommanaboyena et al., Readout of an antiferromagnetic spintronics system by strong exchange coupling of Mn2Au and Permalloy, Nature Communications 12: 6539, 11 November 2021, DOI: 10.1038/s41467-021-26892-7