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Thermodynamics of localized magnetic moments in a Dirac conductor
Physical Review B: Condensed Matter and Materials Physics. 2012. Vol. 86. No. 5. P. 054424.
Burovskiy E., Cheianov V., Falko V., Szyniszewski, M., Sherkunov Y.
We show that the magnetic susceptibility of a dilute ensemble of magnetic impurities in a conductor with a relativistic electronic spectrum is nonanalytic in the inverse temperature at
T−1→0
. We derive a general theory of this effect and construct the high-temperature expansion for the disorder averaged susceptibility to any order, convergent at all temperatures down to a possible ordering transition. When applied to Ising impurities on a surface of a topological insulator, the proposed general theory agrees with Monte Carlo simulations, and it allows us to find the critical temperature of the ferromagnetic phase transition.
Piontkovski D., / Series arXiv "math". 2026.
A noncommutative projective variety is defined, following Artin and Zhang, by a graded coherent algebra 𝐴. The category of coherent sheaves is then the quotient qgr(𝐴) of the category of finitely presented graded modules by the subcategory of torsion modules. We consider the categorical and polynomial entropies of the Serre twist, that is, of the ...
Added: June 23, 2026
Piontkovski D., / Series arXiv "math". 2025.
If a symmetric multilinear algebra is weakly nil, then it is Engel. This result may be regarded as an infinite-dimensional analogue of the well-known Jacobian theorem, which states that if a polynomial mapping has a polynomial inverse, then its Jacobian matrix is invertible. This refines a theorem of Gerstenhaber and partially answers a question posed ...
Added: June 23, 2026
Shipilov F., Barnyakov A., Ivanov A. et al., / Series Physics "arxiv.org". 2026.
A fast simulation of the detector response is a vital task in high-energy physics (HEP). Traditional Monte-Carlo methods form the backbone of modern particle physics simulation software but are computationally expensive. We present a machine-learning-based approach to fast simulation of the Focusing Aerogel Ring Imaging Cherenkov (FARICH) detector response. Given a particle track and momentum, ...
Added: May 19, 2026
Derkacheva A., Sakirkina M., Kraev G. et al., /. 2026.
Comprehensive data on natural hazards and their consequences are crucial for effective for risk assessment, adaptation planning, and emergency response. However, many countries face challenges with fragmented, inconsistent, and inaccessible data, particularly regarding local-scale events. To address this data gap in Russia, we developed an end-to-end processing pipeline that scrapes news from various online sources, ...
Added: April 28, 2026
Pilé I., Deng Y., Shchur L., / Series arXiv "math". 2026. No. 2604.10254.
We investigate the spatial overlap of successive spin configurations in Markov chain Monte Carlo simulations using the local Metropolis algorithm and the Svendsen-Wang and Wolff cluster algorithms. We examine the dynamics of these algorithms for two models in different universality classes: the Ising model and the Potts model with three components. The overlap of two ...
Added: April 20, 2026
Gabdullin N., Androsov I., / Series Computer Science "arxiv.org". 2026.
Label prediction in neural networks (NNs) has O(n) complexity proportional to the number of classes. This holds true for classification using fully connected layers and cosine similarity with some set of class prototypes. In this paper we show that if NN latent space (LS) geometry is known and possesses specific properties, label prediction complexity can ...
Added: April 2, 2026
Stolyarov V. S., Kozlov S. N., Yakovlev D. S. et al., Communications Materials 2026 Vol. 7 Article 91
Superconducting proximity junctions based on topological insulators are widely believed to harbor Majorana-like bound states. If so, the static current phase relationship (CPR) should have a 4π-periodic component. It is then usually assumed that the static CPR can be extended to treat dynamic, voltage-biased, experiments and can justify the suppression of the first phase-lock-in microwave ...
Added: February 5, 2026
Sorokin K., Beketov M., Онучин А. et al., / arxiv.org. Серия cs.SI "Social and Information Networks ". 2025.
Community detection in complex networks is a fundamental problem, open to new approaches in various scientific settings. We introduce a novel community detection method, based on Ricci flow on graphs. Our technique iteratively updates edge weights (their metric lengths) according to their (combinatorial) Foster version of Ricci curvature computed from effective resistance distance between the ...
Added: January 15, 2026
Petrovanov I., Sergeev A., / Series Computer Science "arxiv.org". 2025. No. 2512.18332.
Transport coding reduces message delay in packet-switched networks by introducing controlled redundancy at the transport layer: original packets are encoded into coded packets, and the message is reconstructed after the first successful deliveries, effectively shifting latency from the maximum packet delay to the -th order statistic. We present a concise, reproducible discrete-event implementation of transport coding in OMNeT++, including ...
Added: December 24, 2025
Hessian-based lightweight neural network for brain vessel segmentation on a minimal training dataset
Меньшиков И. А., Бернадотт А. К., Elvimov N. S., / Series arXie "Statistical mechanics". 2025.
Accurate segmentation of blood vessels in brain magnetic resonance angiography (MRA) is essential for successful surgical procedures, such as aneurysm repair or bypass surgery. Currently, annotation is primarily performed through manual segmentation or classical methods, such as the Frangi filter, which often lack sufficient accuracy. Neural networks have emerged as powerful tools for medical image ...
Added: December 1, 2025
Rubchinskiy A., Chubarova D., / Series WP7 "Математические методы анализа решений в экономике, бизнесе и политике". 2025. No. WP7/2025/01.
The article examines one of the most famous examples of socio-economic systems, characterized by significant uncertainty – the S&P-500 stock market, where shares of 500 largest US companies are traded. No assumptions are made about the probabilistic characteristics of the stock market. A flexible algorithm for daily trading has been developed, based on both known fixed data ...
Added: November 9, 2025
Melnikov A., A. A. Sokolik, Selivanov Y. G. et al., Journal of Applied Physics 2025 Vol. 137 No. 16 Article 163104
We report the observation of the electro-optic effect in Bi2Se3 crystals induced by an intense single-cycle terahertz pulse. The effect reveals itself as a transient change of the polarization state of a femtosecond laser pulse reflected from the crystal that is exposed to the terahertz electric field. The corresponding experimental signal follows the field with ...
Added: April 24, 2025
Kovaleva N. N., Chvostova D., Muratov A. V. et al., Applied Physics Letters 2024 Vol. 125 No. 26 Article 262404
The intrinsic antisite defects, which cause doping in the antiferromagnetic topological insulators of the MnTe .n Bi2Te3 (n =1, 2, 3, …,) family, prevent the exploration of the Dirac states affecting the Fermi level (E_F ) position and magnetic properties. In the present study, the MnTe . Bi(2-x)Te3(1-x/2) films grown by the MBE technique onto Si(111) substrates ...
Added: December 29, 2024
Mushenok F., Artem Shevchun, Dmitriy Shovkun et al., Magnetism, Switzerland 2023 Vol. 3 No. 3 P. 259–266
Transition metal dichalcogenides are studied due to the possibility of creating nanoscale semiconductor devices, as well as fundamental issues of magnetic ordering. We have researched the crystal structure and magnetic properties of niobium dichalcogenide Mn0.30NbS2. The results of the X-ray study showed the possible existence of an intermediate 2 a0·2 a0 structure between the "basic" superstructures. Also ...
Added: January 29, 2024
Karabassov T., Bobkova I. V., Silkin V. M. et al., Physica Scripta 2024 Vol. 99 No. 1 Article 015010
At present the superconducting diode effect (SDE) attracts a lot of attention due to new possibilities in the superconducting electronics. One of the possible realizations of the SDE is the implementation in superconducting hybrid structures. In this case the SDE is achieved by means of the proximity effect. However, the optimal conditions for the SDE ...
Added: November 13, 2023
Nikolaev I., Kazakov A., Drozdov K. et al., Journal of Applied Physics 2022 Vol. 132 No. 23 Article 234301
We report a detailed study of the bipolar persistent photoconductivity in an HgTe/CdHgTe double quantum well (DQW), which can be a perspective for studying topological states in these structures. Photoconductivity spectra measurements in the range of 1.1–3.1 eV as well as transport measurements under different illumination conditions were performed at T = 4.2 K. Based on the results, the processes ...
Added: June 7, 2023
Stolyarov V., Pons S., Vlaic S. et al., The Journal of Physical Chemistry Letters 2021 Vol. 12 No. 37 P. 9068–9075
We report on structural and electronic properties of superconducting nanohybrids made of Pb grown in the ultrahigh vacuum on the atomically clean surface of single crystals of topological Bi2Te3. In situ scanning tunneling microscopy and spectroscopy demonstrated that the resulting network is composed of Pb-nanoislands dispersed on the surface and linked together by an amorphous ...
Added: October 18, 2021
Stolyarov V. S., Sheina V. A., Khokhlov D. A. et al., The Journal of Physical Chemistry Letters 2021 Vol. 12 P. 3127–3134
Inelastic interactions of quantum systems with the environment usually wash coherent effects out. In the case of Friedel oscillations, the presence of disorder leads to a fast decay of the oscillation amplitude. Here we show both experimentally and theoretically that in three-dimensional topological insulator Bi2Te3 there is a nesting-induced splitting of coherent scattering vectors which follows ...
Added: March 25, 2021
Pashinsky B. V., Goldstein M., Burmistrov I., Physical Review B: Condensed Matter and Materials Physics 2020 Vol. 102 No. 12 Article 125309
Magnetic impurities with sufficient anisotropy could account for the observed strong deviation of the edge conductance of 2D topological insulators from the anticipated quantized value. In this work we consider such a helical edge coupled to dilute impurities with an arbitrary spin S and a general form of the exchange matrix. We calculate the backscattering current noise ...
Added: January 28, 2021
Durnev M. V., Тарасенко С. А., Annalen der Physik 2019 Vol. 531 No. 6 P. 1–11
Excitation of a topological insulator by a high‐frequency electric field of a laser radiation leads to a dc electric current in the helical edge channel whose direction and magnitude are sensitive to the radiation polarization and depend on the physical properties of the edge. An overview of theoretical and experimental studies of such edge photoelectric ...
Added: November 12, 2020
Galeeva A. V., Kazakov A. S., Artamkin A. I. et al., Scientific Reports 2020 Vol. 10 Article 2377
We show that the terahertz (THz) photoconductivity in the topological phase of Hg1–xCdxTe-based structures exhibits the apparent PT- (parity-time) symmetry whereas the P-symmetry and the T-symmetry, separately, are not conserved. Moreover, it is demonstrated that the P- and T-symmetry breaking may not be related to any type of the sample anisotropy. This result contradicts the apparent symmetry arguments and means ...
Added: March 13, 2020
Klimin S. A., Popova E., Popova M. N., Journal of Physics: Conference Series 2019 Vol. 1389 No. 1 P. 012039
We present low-temperature far-infrared study of Sm2BaNiO5. The lowest-frequency phonon of Sm2BaNiO5 generated by the motion of the Sm3+ ion demonstrates anomalous behaviour at temperatures lower than the Néel temperature, T<TN=55 K. This phonon hardens at the magnetic ordering although its frequency shift does not follow the magnetic order parameter. The observed phenomenon is responsible for ...
Added: December 19, 2019
Kuntsevich A., Martovitskiy V., Rybalchenko G. et al., Materials 2019 Vol. 12 No. 23 P. 3899
In this study, we grew Cu co-doped single crystals of a topological superconductor candidate SrxBi2Se3, and studied their structural and transport properties. We reveal that the addition of even as small an amount of Cu co-dopant as 0.6 atomic %, completely suppresses superconductivity in SrxBi2Se3. Critical temperature (∼2.7 K) is rather robust with respect to ...
Added: November 29, 2019
Klimin S. A., E. A. Popova, Popova M. N., , in: Journal of Physics: Conference SeriesVol. 1389: VII Euro-Asian Symposium "Trends in Magnetism" 8–13 September 2019, Ekaterinburg, Russian Federation.: Bristol: IOP Publishing, 2019. Ch. 012039 P. 1–5.
We present low-temperature far-infrared study of Sm2BaNiO5. The lowest-frequency phonon of Sm2BaNiO5 generated by the motion of the Sm3+ ion demonstrates anomalous behaviour at temperatures lower than the Néel temperature, T<TN=55 K. This phonon hardens at the magnetic ordering although its frequency shift does not follow the magnetic order parameter. The observed phenomenon is responsible for ...
Added: October 30, 2019