In collaboration with researchers from the Institute of Mathematics, Physics and Mechanics and research institutions from India, the UK, France and the US, we discovered the first realization of a quantum spin liquid on a triangular spin lattice with dominant Ising antiferromagntic exchange interaction. An extensive experimental study was conducted, showing the absence of magnetic ordering and proving the existence of Ising-type spin correlations in neodymium heptatantalate NdTa7O19 at temperatures of only a few tens of millikelvins. The discovery of the Ising spin liquid introduces a new type of this enigmatic quantum entangled state of matter that remains dynamical down to the lowest temperatures. These results are published in the paper entitled The Ising triangular-lattice antiferromagnet neodymium heptatantalate as a quantum spin liquid candidate in the esteemed Nature Materials journal.
Quantum Materials group is looking for a postdoctoral candidate to work on a project on nitrogen vacancy (NV) center magnetometry, in which we are developing a low-temperature probe based on diamond NV centers with a specific aim to address condensed-matter problems of unconventional superconductivity.
In 2022, we are integrating NV magnetometry with a low-temperature cryostat targeting the low-temperature physics of quantum materials. In this project, we would like to apply NV centers as a probe to investigate vortices in type-II superconductors, e.g. iron-pnictide or alkali-doped fulleride superconductors.
The candidate will be fully involved in the instrumentation development, optimization, and studies of target quantum materials. The position is initially open for the period from 1. 1. 2022 to 31. 12. 2024.
In collaboration with prof. Peter Prelovšek from the Department of Theoretical Physics and researchers from United Kingdom, USA and China, we have published a paper entitled “Origin of Magnetic Ordering in a Structurally Perfect Quantum Kagome Antiferromagnet” in Physical Review Letters.
Odpira se nam prosto mesto za mladega raziskovalca pod mentorstvom Mateja Preglja z začetkom oktobra 2020. Iščemo vedoželjnega, delovnega, predvsem pa radovednega kandidata, ki nima strahu pred novimi in še nerešenimi fizikalnimi ugankami.
We have recently submitted two preprints to arXiv. We cordially invite you to read them and send any comments!
T. Arh, M. Gomilšek, P. Prelovšek, M. Pregelj, M. Klanjšek, A. Ozarowski, S. J. Clark, T. Lancaster, W. Sun, J.-X. Mi, and A. Zorko, The Origin of Magnetic Ordering in a Structurally-Perfect Quantum Kagome Antiferromagnet, arXiv:1912.09047 (submitted on 19 Dec 2019)
Ž. Gosar, N. Janša, T. Arh, P. Jeglič, M. Klanjšek, H. F. Zhai, B. Lv, and D. Arčon, Superconductivity in the regime of attractive interactions in the Tomonaga-Luttinger liquid, arXiv:2001.07909 (submitted on 22 Jan 2020)
A new paper by T. Knaflič, P. Jeglič, M. Komelj, A. Zorko, P. K. Biswas, A. N. Ponomaryov, S. A. Zvyagin, M. Reehuis, A. Hoser, M. Geiß, J. Janek, P. Adler, C. Felser, M. Jansen, and D. Arčon has been published as an Editor’s suggestion in Physical Review B.
Prof. Denis Arčon (third from the left) receiving the Zois award. Photo credit: Marjan Verč, IJS
On November 20, 2019, the Republic of Slovenia awarded the highest prizes and awards for outstanding achievements in science, research and development to 18 top scientists. Among them, professor dr. Denis Arčon received the Žiga Zois Prize for outstanding achievements in the fields of quantum magnetism and unusual superconductivity.