News (18 Dec 2016 - 24 Feb 2018)
Ulrafast spin transfer torque
P. Baláž, M. Žonda, K. Carva et al. presented a theoretical model of generation of spin transfer torque in metallic spin valves using a femtosecond laser pulse.
I. Turek contributed to a research demonstrating reproducible switching in antiferromagnetic Mn2Au using current pulse generated bulk spin-orbit torques and read-out by magnetoresistance measurements.
R. Sýkora and T. Novotný commented on a paper discussing a question "Is the Antiresonance in Meta-Contacted Benzene Due to the Destructive Superposition of Waves Traveling Two Different Routes around the Benzene Ring?"
Ultrafast relaxation dynamics
P. Maldonado, K. Carva et al. presented a research on ultrafast relaxation dynamics in metals. They developed an out-of-equilibrium theory that captures the full dynamic evolution of the electronic and phononic populations and provides a microscopic description of the transfer of energy delivered optically into electrons to the lattice.
Handbook of Magnetic Materials
K. Carva, P. Baláž, and I. Radu contributed to the Handbook of Magnetic Materials (vol. 26) with a chapter entitled Laser-Induced Ultrafast Magnetic Phenomena.
Molecules and the graph theory
Ruda Sýkora and Tomáš Novotný present a method based on graph theory for the evaluation of the inelastic propensity rules for molecules exhibiting complete destructive quantum interference in their elastic transmission. The method can be fully automated and they provide a functional website running a code using Wolfram Mathematica which allows everyone to examine their molecules.
Superconducting quantum dot: symmetric vs. asymmetric
A. Kadlecová and her mates studied the Anderson single-level quantum dot attached to two BCS superconducting leads. They revealed that a system with asymmetric tunnel coupling to the leads can be related to the symmetric one. Surprisingly, it is the symmetric case which is the most general, meaning that all physical quantities in the case of asymmetric coupling are fully determined by the symmetric ones.
Interplay between correlation effects and electron pairing
T. Domański et al. studied subgap spectrum of the interacting single-level quantum dot coupled between two superconducting reservoirs, forming the Josephson-type circuit, and additionally hybridized with a metallic normal lead. They quantitatively establish the phase-dependent Kondo temperature and show that it can be read off from the half-width of the zero-bias enhancement in the Andreev conductance in the doublet phase.
Stoner versus Heisenberg
E. Turgut et al. use ultrafast high harmonics to measure time-, energy-, and angle-resolved M-edge magnetic asymmetry spectra for Co films after optical pumping to induce ultrafast demagnetization. They found that the magnon contribution to ultrafast demagnetization is already strong on subpicosecond time scales, while the reduction in exchange splitting persists to several picoseconds.
T. Chlouba, M. Žonda, and T. Novotný published a comment on recent Letter by Andrianov et al. Using sparse numerical solvers they shown that some of the results in the original letter are incorrect, most likely due to insufficient Monte Carlo sampling. These findings call for a corrected interpretation of the physical behavior of the studied model.