Extra Spin-Wave mode in Quantum Hall systems. Beyond the Skyrmion Limit

We report on the observation of a new spin mode in a quantum Hall system in the vicinity of odd electron filling factors under experimental conditions excluding the possibility of Skyrmion excitations. The new mode having presumably zero energy at odd filling factors emerges at small deviations from odd filling factors and couples to the spin-exciton. The existence of an extra spin mode assumes a nontrivial magnetic order at partial fillings of Landau levels surrounding quantum Hall ferromagnets other then the Skyrmion crystal.Comment: 9 pages, 4 figure

Doctrine of Love in Writings of 14th-Century Persian Mystic Mahmud Kashani

The article is devoted to the work of Mahmud Kashani (d. 735/1334-35), who was a sheikh of the Suhravardiya Sufi order and the author of several significant works. The object of analysis was one of the parts of his most famous work — the prose treatise “The lamp that indicates the true path, and the key to a sufficient amount [of mystical knowledge]”. The article deals with the religious views and scientific heritage of Mahmud Kashani. A commented translation of part of the first section “On Love” from the tenth chapter “Explanation of mystical states” of the specified work is proposed. Since Mahmud Kashani is also credited with the poem “Treasures of Secrets and Symbols of the Righteous”, dedicated to the psychological aspects of mystical love, we have also translated one of its chapters. Comparison of fragments of these works shows significant discrepancies in the explanation of love, which may be due to the fact that the author expounds the concept of love of ascetic Sufism in the first essay, and Sufism “based on love” in the second. The second direction goes back to the composition of the “Revelation of Love” by the Persian mystical philosopher Ahmad Ghazali. It is also possible that ‘Izz ad-Din Mahmud is not the author of the poem “Treasures of Secrets…”

Electron energy relaxation under terahertz excitation in (Cd1−xZnx)3As2 Dirac semimetals

We demonstrate that measurements of the photo-electromagnetic effect using terahertz laser radiation provide an argument for the existence of highly conductive surface electron states with a spin texture in Dirac semimetals (Cd₁-xZnx)₃As

Chemical analysis of aerosol in the Venusian cloud layer by reaction gas chromatography on board the Vega landers

The experiment on sulfuric acid aerosol determination in the Venusian cloud layer on board the Vega landers is described. An average content of sulfuric acid of approximately 1 mg/cu m was found for the samples taken from the atmosphere at heights from 63 to 48 km and analyzed with the SIGMA-3 chromatograph. Sulfur dioxide (SO2) was revealed in the gaseous sample at the height of 48 km. From the experimental results and blank run measurements, a suggestion is made that the Venusian cloud layer aerosol consists of more complicated particles than the sulfuric acid water solution does