A team of researchers from France, India, and Slovenia was able to demonstrate the absence of a spin gap in the ground state of the iconic kagome-lattice material herbertsmithite. Their investigation entitled “Gapless ground state in the archetypal quantum kagome antiferromagnet ZnCu3(OH)6Cl2”, published in the renowned journal Nature Physics, was co-authored by Andrej Zorko from the Solid State Physics Department of the Jožef Stefan Institute and the Physics Department of the Faculty of Mathematics and Physics, UL. The discovery refutes a decade-old belief of a finite gap in this material and puts the enigmatic spin-liquid state in a completely new perspective. This experimental finding is consistent with recent theories suggesting a U(1) Dirac spin liquid as the ground state of the Heisenberg kagome antiferromagnet.
In a paper, published in Physical Review X, Simon Čopar, Jure Aplinc, Žiga Kos, Slobodan Žumer and Miha Ravnik ( Department of Physics UL-FMF, Department of Solid-state Physics IJS), present the first numerical study of the topology of three-dimensional active nematic turbulence in a spherical confinement. Simulations were performed using a mesoscopic model of active nematic fluids, which are most commonly used to describe biological systems driven by internal conversion of stored energy (usually chemical) into motion. The chaotic motion in the active turbulence was explained by elementary topological events that affect defect lines appearing in such systems. Additionally, a coupling of surface and bulk dynamics through defects was demonstrated.
Sustainable Industrial Processing Summit (SIPS 2019) took place in Cyprus from 23th to 26th of October 2019. A special symposium was organized in honor of the distinguished work and lifetime achievements of prof. Spomenka Kobe from the Department of nanostructured materials, who is well known in the area of magnetic materials. At this conference, Dr. Nina Kostevšek was awarded the Wüthrich International Young Star Award for the outstanding performances during the early career stages. This award has been established in honour of the distinguished work and lifetime achievements of 2002 Nobel Laureate in Chemistry, Prof. Kurt Wüthrich, who is known for developing the NMR method for studying macrobiological molecules. Dr. Nina Kostevšek presented work on the development of new nanoparticle-based contrast agents for magnetic resonance imaging.
The Jozef Stefan Institute is pre-announcing a public call for candidates for the position of Director of the Jozef Stefan Institute - LINK