-
Granular Aluminum Kinetic Inductance Nonlinearity Jetp Lett. (IF 1.3) Pub Date : 2024-03-22 M. Zhdanova, I. Pologov, G. Svyatsky, V. Chichkov, N. Maleeva
Granular Aluminum is a superconductor known for more than eighty years, which recently found its application in qubits, microwave detectors and compact resonators, due to its high kinetic inductance, critical magnetic field and critical current. Here we report on the nonlinear dependence of granular Aluminum inductance on current, which hints towards parametric amplification of the microwave signal
-
Deep Learning Ghost Polarimetry Jetp Lett. (IF 1.3) Pub Date : 2024-03-22 D. Agapov, A. Ivchenko, S. Magnitskiy
The first application of neural networks in the problem of ghost polarimetry is reported. The proposed approach has enabled the reconstruction of the spatial distribution of object anisotropy in ghost polarimetry. The deep neural network processes a set of intensity correlation functions measured in various polarization states of classical light and reconstructs, point-by-point, the distribution of
-
Quantum-assisted Open-pit Optimization Jetp Lett. (IF 1.3) Pub Date : 2024-03-22
With the recent advances in experimental realization of multi-qubit systems the idea of delegating certain real-life optimization tasks to a quantum computer becomes viable. In particular, we herein examine a variational quantum algorithm applied to a three-dimensional problem of open-pit mining, where the core of the classical optimization loop is provided by the probabilistic tensor sampling method
-
Erratum to: Suppression of Superconducting Fluctuations in Multiband Superconductors as a Mechanism for Increasing the Critical Temperature (Mini-Review) Jetp Lett. (IF 1.3) Pub Date : 2024-03-05 A. V. Krasavin, A. V. Vagov, A. S. Vasenko, V. S. Stolyarov, A. A. Shanenko
An Erratum to this paper has been published: https://doi.org/10.1134/S0021364024020012
-
Barrier-well Potential Configuration for Quantum Gyroscope Based on Atomic BEC Geometric Phase Jetp Lett. (IF 1.3) Pub Date : 2024-02-26 V. A. Tomilin, A. M. Rostom, L. V. Il’ichov
A perspective scheme of quantum gyroscope based on measurement of geometric phase emerging in atomic Bose–Einstein condensate (BEC) was developed. The main elements of the device are two ring-shaped BEC configurations intercepted by a pair of localized potentials – a barrier and a well. Their placement in each ring defines their orientation with respect to the angular velocity of rotation of the device’s
-
Perturbations in Horndeski Theory above Anisotropic Cosmological Background Jetp Lett. (IF 1.3) Pub Date : 2024-02-26 S. A. Mironov, A. M. Shtennikova
Considering an anisotropic cosmological background is an interesting and simultaneously challenging problem of theoretical physics, since we not only assume a high degree of anisotropy in the early stages of the Universe, but also observe it to a small degree until now. In this paper we have constructed the unconstrained action for the perturbations above Bianchi I type background in the most general
-
Shot Noise in Helical Edge States in Presence of a Static Magnetic Defect Jetp Lett. (IF 1.3) Pub Date : 2024-02-26
The Fano factor, \(\mathcal{F}\) , of the shot noise of the current through the edge states of a two-dimensional topological insulator with contacts of generic type is calculated. A magnetic static defect changes \(\mathcal{F}\) significantly. For metallic contacts, as the strength of the defect increases, the Fano factor increases from \(\mathcal{F}\) = 0 to its maximum value, \({{\mathcal{F}}_{{\max
-
Сonductance Quantization Features in Multichannel Quantum Point Contacts Jetp Lett. (IF 1.3) Pub Date : 2024-02-26 D. A. Pokhabov, A. G. Pogosov, A. A. Shevyrin, E. Yu. Zhdanov, A. K. Bakarov
A multichannel electron transport mode with independent conductance quantization in individual channels is implemented and studied in quantum point contacts with side gates. Simulation of the total conductance as the sum of quantized individual conductances reproduces the experimentally observed complex conductance dependence on the sum and difference of gate voltages in this regime. The considered
-
Anomalous Cosmic-ray Correlations Revisited with a Complete Full-sky Sample of BL Lac Type Objects Jetp Lett. (IF 1.3) Pub Date : 2024-02-26 M. A. Kudenko, S. V. Troitsky
Cosmic rays with energies above 1019 eV, observed in 1999–2004 by the High Resolution Fly’s Eye (HiRes) experiment in the stereoscopic mode, were found to correlate with directions to distant BL Lac type objects (BL Lacs), suggesting non-standard neutral particles travelling for cosmological distances without attenuation. This effect could not be tested by newer experiments because of their inferior
-
Scattering of Linear Waves on a Soliton Jetp Lett. (IF 1.3) Pub Date : 2024-02-26 A. S. Dmitriev, E. A. Dmitrieva, A. G. Panin
We have shown that the wave scattering by a soliton of nonlinear Schr¨odinger equation occurs in a peculiar way. The nonlinear interaction leads to the generation of waves with frequencies that are multiples of the frequency of the incident wave, minus the frequency of the soliton, while the soliton experiences growth due to the absorption of particles from the incoming wave. We propose an analytical
-
Features of the Production of Antiprotons with High Transverse Momenta at an Angle of 40° in Collisions of a 50-GeV Proton Beam with Nuclei Jetp Lett. (IF 1.3) Pub Date : 2024-02-27 N. N. Antonov, V. A. Viktorov, V. A. Gapienko, G. S. Gapienko, I. V. Lobov, F. N. Novoskol’tsev, A. F. Prudkoglyad, A. A. Semak, I. P. Solodovnikov, V. I. Terekhov, M. N. Ukhanov, S. S. Shimanskii
-
Structural Micromodification of Diamond by Femtosecond Laser Pulses Through Optical Contact with a Nonlinear Highly Refractive Immersion Medium Jetp Lett. (IF 1.3) Pub Date : 2024-02-12 E. V. Kuzmin, G. K. Krasin, Y. S. Gulina, P. A. Danilov, D. A. Pomazkin, A. V. Gorevoy, S. V. Kuznetsov, V. V. Voronov, V. U. Kovalev, S. I. Kudryashov, A. O. Levchenko, E. V. Karaksina, V. S. Shiryaev
Using femtosecond laser pulses delivered through an optical contact with a highly refractive zinc sulfide immersion medium, a readable photoluminescent micromark was written in the bulk of diamond. The influence of a highly refractive immersion medium on the position and size of the confocal region when reading a luminescent micromark is shown. It was established that in the materials under study the
-
Enhancement of Terahertz Radiation from Saccharide Solutions Induced by Femtosecond Laser Pulses Jetp Lett. (IF 1.3) Pub Date : 2024-02-12 Ch. Chang, T. Shen, H. Wang, H. Li, T. Wang, J. Liu, G. He, Y. Zhang, L. Li
Liquid is a promising candidate for terahertz radiation induced by femtosecond laser pulses, since it has advantages of higher molecular density, lower ionization potential and better self-healing properties compared with gases. In this work, an enhancement of terahertz radiation from saccharide solutions induced by femtosecond laser pulses is demonstrated, and the characteristics of terahertz radiation
-
High-fidelity and Robust Stimulated Raman Transition with Parameter-modulated Optimal Control Jetp Lett. (IF 1.3) Pub Date : 2024-02-12
High-fidelity and robust quantum control is essential for large-scale quantum information processing. The stimulated Raman transition that utilizes second-order coupling effect is a valuable and conventional technique for manipulating states in multi-level quantum systems, but its accuracy is limited by the driving-induced Stark shift. Here, we propose a new parameter-modulated method to effectively
-
Anisotropic Josephson Diode Effect in the Topological Hybrid Junctions with the Hexagonal Warping Jetp Lett. (IF 1.3) Pub Date : 2024-02-12 T. Karabassov
Recently the diode effect in superconductivity became an active area of research. In particular, the three-dimensional topological insulators may be one of the most suitable materials to implement the superconducting diodes. It is common to consider only linear and quadratic terms of the topological insulator Hamiltonian in the low energy expansion. Typically the effect of the hexagonal warping is
-
Superconducting Order Parameter Structure in the Nematic Phase of Iron-based Materials Jetp Lett. (IF 1.3) Pub Date : 2024-02-12 M. M. Korshunov, Yu. N. Togushova
We consider the effect of the nematic order on the formation of the superconducting state in iron pnictides and chalcogenides. Nematic order with the B2g symmetry is modelled as the d-type Pomeranchuk instability and treated within the mean-field approach. Calculated nematic order parameter depends on the nematic interaction coefficient and abruptly changes with the coefficient’s increase. The superconducting
-
Fermionic Quartet and Vestigial Gravity Jetp Lett. (IF 1.3) Pub Date : 2024-02-12
We discuss the two-step transitions in superconductors, where the intermediate state between the Cooper pair state and the normal metal is the 4-fermion condensate, which is called the intertwined vestigial order. We discuss different types of the vestigial order, which are possible in the spin-triplet superfluid 3He, and the topological objects in the vestigial phases. Since in 3He the order parameter
-
Magnetic Eigenmodes in Chains of Coupled φ0-Josephson Junctions with Ferromagnetic Weak Links Jetp Lett. (IF 1.3) Pub Date : 2024-01-29 G. A. Bobkov, I. V. Bobkova, A. M. Bobkov
A coupled chain of superconductor/ferromagnet/superconductor (S/F/S) with anomalous ground phase shift φ0 represents a system realizing long-range interaction between magnetic moments of the weak links. The interaction is of magnetoelectric origin and is mediated by the condensate phase of superconductors. The system is a paradigmic platform for investigation of collective magnetic states governed
-
Generation of Terahertz Radiation by Relativistic Laser Pulses on the Surface of Thick Solid Targets and Thin Foils Jetp Lett. (IF 1.3) Pub Date : 2024-01-29 A. V. Mitrofanov, M. V. Rozhko, M. M. Nazarov, N. V. Yakushkin, A. A. Voronin, A. B. Fedotov, D. A. Sidorov-Biryukov
Terahertz pulse generation from multiterawatt laser surface plasma near thick solid targets and thin foils has been studied. Pulses with energies up to 7 μJ were detected in the spectral region <3THz in the direction of specular reflection from the surface of the CaF2 target. The dependence of the terahertz pulse energy WT Hz on the laser pulse intensity \(I_{L}^{\alpha }\) can be approximated by the
-
Suppression of Superconducting Fluctuations in Multiband Superconductors as a Mechanism for Increasing the Critical Temperature (Mini-review) Jetp Lett. (IF 1.3) Pub Date : 2024-01-29
The combination of strongly coupled Cooper pairs and weak superconducting fluctuations is an important prerequisite for achieving high-temperature superconductivity. The review is devoted to the implementation of this condition in multiband superconductors, in which strongly coupled pairs in the shallow conduction band (the Fermi level is close to the band edge) coexist with ordinary, weakly fluctuating
-
The Gailitis–Damburg Oscillations in the Three-body e–e+ $$\bar {p}$$ System Jetp Lett. (IF 1.3) Pub Date : 2024-01-29 V. A. Gradusov, S. L. Yakovlev
We study the near threshold behavior of cross sections of low-energy antiproton scattering off the ground and excited states of positronium with zero total orbital momentum L = 0. In our computational experiment, the existence of singularities called the Gailitis–Damburg oscillations above the thresholds of excited states of positronium and antihydrogen atoms is confirmed. In the future the obtained
-
Effect of Cobalt Concentration on the Magnetic Properties of the Co1 – xMgxFe2O4 Nanocrystals Jetp Lett. (IF 1.3) Pub Date : 2024-01-15 O. S. Ivanova, I. S. Edelman, S. G. Ovchinnikov, A. Thakur, P. Thakur, A. L. Sukhachev, Y. V. Knyazev, R. D. Ivantsov, M. S. Molokeev
Nanoparticles of Co1 – xMgxFe2O4 with x equal to 0, 0.2, 0.4, 0.6, 0.8 and 1.0 have been synthesized. For all values of x, they are nanocrystals with a cobalt ferrite structure and an average linear size (56 ± 3) nm. Based on the analysis of the Mossbauer effect spectra, the Co2+ ions were shown to occupy only octahedral positions at all values of x. The experimentally obtained dependence of the nanoparticles
-
Selective Damping of Plasmons in Coupled Two-dimensional Systems by Coulomb Drag Jetp Lett. (IF 1.3) Pub Date : 2024-01-15
The Coulomb drag is a many-body effect observed in proximized low-dimensional systems. It appears as emergence of voltage in one of them upon passage of bias current in another. The magnitude of drag voltage can be strongly affected by exchange of plasmonic excitations between the layers; however, the reverse effect of Coulomb drag on properties of plasmons has not been studied. Here, we study the
-
Multiband Superconductivity in KCa2Fe4As4F2 Jetp Lett. (IF 1.3) Pub Date : 2024-01-15 A.V. Sadakov, A. A. Gippius, A. T. Daniyarkhodzhaev, A. V. Muratov, A. V. Kliushnik, O. A. Sobolevskiy, V A. Vlasenko, A. I. Shilov, K. S. Pervakov
The paper reports complementary studies of the order parameter of the newly discovered iron-based superconductor, KCa2Fe4As4F2 (Tc = 34 K), that consists of alternating blocks of KFe2As2 (122) phase and CaFeAsF (1111) phase. We performed high-resolution intrinsic multiple Andreev reflection spectroscopy supplemented with self-field critical current measurements. Andreev spectra, obtained by means of
-
One-loop Electroweak Radiative Corrections to polarized e+e– → γZ Process Jetp Lett. (IF 1.3) Pub Date : 2024-01-15 S. Bondarenko, Ya. Dydyshka, L. Kalinovskaya, L. Rumyantsev, R. Sadykov, V. Yermolchyk
This paper gives high-precision theoretical predictions for cross sections of the process e+e– → γZ for future electron-positron colliders. The calculations are performed using the SANC system. They include complete one-loop electroweak radiative corrections, as well as longitudinal polarization of the initial state. Numerical results are given for the center-of-mass system energy range \(\sqrt s \)
-
Electric Area Conservation Rule and the Validity of Some Models of Subcycle Pulse Propagation Jetp Lett. (IF 1.3) Pub Date : 2024-01-15 A. V. Pakhomov, N. N. Rosanov, M. V. Arkhipov, R. M. Arkhipov
The validity issues of some approximations widely used to describe subcycle pulse propagation in various non-magnetic media are addressed. As the validity criteria we apply the fundamental electric area conservation rule, which directly follows from the Maxwell’s equations in the 1D case. The general relations are derived for the possible values of the electric area in different media. It is shown
-
Contrast of Ramsey-CPT Fringes in Quenching and Depolarizing Gases Jetp Lett. (IF 1.3) Pub Date : 2023-12-25 D. S. Chuchelov, M. I. Vaskovskaya, E. A. Tsygankov, S. A. Zibrov, K. M. Sabakar, V. V. Vassiliev, V. L. Velichansky
Molecular nitrogen is often used as a buffer gas in cells with alkali metals due to its known ability to quench resonant fluorescence. It is widely accepted that the suppression of spontaneous emission decreases the width of coherent population trapping resonance. However, our recent results have not confirmed this positive action of molecular nitrogen within the typical range of 87Rb concentrations
-
Self-focusing and Self-phase Modulation of Focused Femtosecond Laser Beam in Fused Silica at Near-critical Peak Power Jetp Lett. (IF 1.3) Pub Date : 2023-12-25 I. O. Kinyaevskiy, A. V. Koribut, P. A. Danilov, S. I. Kudryashov
Self-focusing and self-phase modulation of focused femtosecond laser pulse were studied in bulk fused silica. Depending on pulse energy magnitude, three different regimes were observed in the experiment: 1) linear regime, when the self-focusing effect is insignificant, characterized by linear spectral broadening; 2) transition regime, when the self-focusing effect notably reduces a laser beam spot
-
On Production of Heavy Charged Particles in γγ Fusion at Planned pp Colliders Jetp Lett. (IF 1.3) Pub Date : 2023-12-25
Production of heavy fermions in ultraperipheral collisions (pp → p + γγ + p → p + χ+χ– + p) and the semiexclusive reaction (pp → p + γγ* + X → p + χ+χ– + X) is considered. Differential and total cross sections for the energies of the planned pp colliders are presented.
-
Effect of Dephasing on the Current Through a Periodically Driven Quantum Point Contact Jetp Lett. (IF 1.3) Pub Date : 2023-12-25 I. Ermakov, O. Lychkovskiy
We consider two one-dimensional quantum XX magnets linked by a periodically driven quantum point contact. If magnets are initially polarized in opposite directions, one expects that a spin current through the quantum point contact will establish. It has been shown recently [Phys. Rev. B 103, L041405 (2021)] that, in fact, when the driving frequency exceeds a critical value, the current halts completely
-
Magnon Topological Transition in Skyrmion Crystal Jetp Lett. (IF 1.3) Pub Date : 2023-12-12 V. E. Timofeev, Yu. V. Baramygina, D. N. Aristov
We study the magnon spectrum in skyrmion crystal formed in thin ferromagnetic films with Dzyalosinskii–Moria interaction in presence of magnetic field. Focusing on two low-lying observable magnon modes and employing stereographic projection method, we develop a theory demonstrating a topological transition in the spectrum. Upon the increase of magnetic field, the gap between two magnon bands closes
-
On the Character of Superconductivity and Topological Properties of SnAs Jetp Lett. (IF 1.3) Pub Date : 2023-12-12 K. A. Dmitrieva, P. I. Bezotosnyi, V. M. Pudalov
The paper describes results of the band structure measurements of SnAs single crystals by the ARPES technique. We performed detailed analysis of isoenergetic surfaces in the vicinity and below the Fermi energy. The ARPES experimental data are consistent with theoretically predicted shape of the SnAs Fermi surface. The determined type of the Fermi surface provides the basis for estimating the Ginzburg–Landau
-
Local Quench within Keldysh Technique Jetp Lett. (IF 1.3) Pub Date : 2023-12-12 A. A. Radovskaya, A. G. Semenov
The problem of quantum scalar field evolution after an instantaneous local perturbation (quench) is considered. A new approach to descriptions of a quench from an arbitrary initial state is developed in the framework of the Keldysh technique. This approach does not require the procedure of the analytical continuation, which can be ambiguous in some cases. The evolution of the energy density after local
-
Tensor Train Optimization of Parameterized Quantum Circuits Jetp Lett. (IF 1.3) Pub Date : 2023-12-12 G. Paradezhenko, A. Pervishko, D. Yudin
We examine a particular realization of derivative-free method as implemented on tensor train based optimization to the variational quantum eigensolver. As an example, we consider parameterized quantum circuits composed of a low-depth hardware-efficient ansatz and Hamiltonian variational ansatz for addressing the ground state of the transverse field Ising model. We further make a comparison with gradient-based
-
Quantum Size Effect in Three-Dimensional Microscopic Semiconductor Crystals Jetp Lett. (IF 1.3) Pub Date : 2023-12-11 A. I. Ekimov, A. A. Onushchenko
-
Observation of Optical Orientation of Equilibrium Electrons in N-Type Semiconductors Jetp Lett. (IF 1.3) Pub Date : 2023-12-11 A. I. Ekimov, V. I. Safarov
-
Generation of Reflected Second Harmonic at Semiconductor Quantum Dots Jetp Lett. (IF 1.3) Pub Date : 2023-12-11 O. A. Aktsipetrov, A. A. Nikulin, A. I. Ekimov
-
Oscillations of Polarization of Recombination Radiation of a Variable-Gap Semiconductor in a Magnetic Field Jetp Lett. (IF 1.3) Pub Date : 2023-12-11 A. S. Volkov, A. I. Ekimov, S. A. Nikishin, V. I. Safarov, B. V. Tsarenkov, G. V. Tsarenkov
-
Influence of Spin Relaxation of “Hot” Electrons on the Effectiveness of Optical Orientation in Semiconductors Jetp Lett. (IF 1.3) Pub Date : 2023-12-11 A. I. Ekimov, V. I. Safarov
-
Size Quantization of the Electron Energy Spectrum in a Microscopic Semiconductor Crystal Jetp Lett. (IF 1.3) Pub Date : 2023-12-11 A. I. Ekimov, A. A. Onushchenko
-
Optical Orientation of Carriers in Interband Transitions in Semiconductors Jetp Lett. (IF 1.3) Pub Date : 2023-12-11 A.I. Ekimov, V.I. Safarov
-
Optical Electron-Nuclear Resonance in Semiconductors Jetp Lett. (IF 1.3) Pub Date : 2023-12-11 A. I. Ekimov, V. I. Safarov
-
Optical Orientation of Free and Bound Excitons in Hexagonal Crystals Jetp Lett. (IF 1.3) Pub Date : 2023-12-11 E. F. Gross, A. I. Ekimov, B. S. Razbirin, V. I. Safarov
-
Optical Detection of Dynamic Polarization of Nuclei in Semiconductors Jetp Lett. (IF 1.3) Pub Date : 2023-12-11 A.I. Ekimov, V.I. Safarov
-
Reentrant Proximity-induced Superconductivity for GeTe Semimetal Jetp Lett. (IF 1.3) Pub Date : 2023-11-27 V. D. Esin, D. Yu. Kazmin, Yu. S. Barash, A. V. Timonina, N. N. Kolesnikov, E. V. Deviatov
We experimentally investigate charge transport in In-GeTe and In-GeTe-In proximity devices, which are formed as junctions between superconducting indium leads and thick single crystal flakes of α-GeTe topological semimetal. We observe nonmonotonic effects of the applied external magnetic field, including reentrant superconductivity in In-GeTe-In Josephson junctions: supercurrent reappears at some finite
-
Nodal Line Topological Superconducting State in Quasi-one-dimensional A2Cr3As3 (A = K, Rb, Cs) Superconductors Jetp Lett. (IF 1.3) Pub Date : 2023-11-27 M. Wang, W. LiMing, T. Zhou
In this theoretical study, we examine the topological properties of the recently discovered A2Cr3As3 (A=K, Rb, Cs) superconductors. In the superconducting state, characterized by a typical pz-wave pairing symmetry, a line nodal exists in the kz = 0 plane, confirming the system as a topological nodal-line superconductor. When considering an open boundary along the z-direction, flat surface bands emerge
-
Anisotropy of the Critical Current and Abrikosov Vortex Pinning in Magnetic Superconductor EuCsFe4As4 Jetp Lett. (IF 1.3) Pub Date : 2023-11-27 A. Yu. Degtyarenko, V. A. Vlasenko, T. E. Kuzmicheva, K. S. Pervakov, S. Yu. Gavrilkin, A. Yu. Tsvetkov, S. A. Kuzmichev
In this study, for the first time, we present a systematic study of the critical current density Jc at two magnetic field orientations B || ab and B || c in a single crystal of the superconducting pnictide EuCsFe4As4, which shows a magnetic ordering below Tc and belongs to the 1144 family. The anisotropy of Jc and its temperature dependence are determined. The exponents α of the Jc(B) dependences from
-
Extended Analytical Model for the Description of Light Absorption Spectra of Linear Molecular Aggregates Jetp Lett. (IF 1.3) Pub Date : 2023-11-27 S. S. Moritaka, V. S. Lebedev
We study optical properties of linear dye aggregates in which the transition dipole matrix elements of two monomer molecules forming their unit cell are not coplanar with the aggregate axis, and the Frenkel exciton is delocalized along this axis. An analytical model has been developed for the description of polarization effects in the light absorption spectra of such aggregates. It is shown that the
-
The Effect of T-invariance Violation in Scattering of Polarized 3He Nuclei on Tensor-polarized Deuterons Jetp Lett. (IF 1.3) Pub Date : 2023-11-27 Yu. N. Uzikov, M. N. Platonova
In the interaction of a transversely polarized nuclear beam with a tensor-polarized deuteron target, a nonzero value of the component of the total cross section corresponding to this combination of polarizations is an unambiguous signal of T-invariance violation while P-parity is preserved. The method developed earlier for calculating this component of the total cross section for pd scattering based
-
Linearly Polarized Gluon Density in the Rescaling Model Jetp Lett. (IF 1.3) Pub Date : 2023-11-14 N. A. Abdulov, X. Chen, A. V. Kotikov, A. V. Lipatov
The low-x behavior of the linearly polarized gluon density hg(x, \(k_{t}^{2}\), Q2) in nuclei is studied in the rescaling model at small transverse momentum kt.
-
Giant Planar Hall Effect in an Ultra-Pure Mercury Selenide Single Crystal Sample Jetp Lett. (IF 1.3) Pub Date : 2023-11-16 S. B. Bobin, A. T. Lonchakov
-
The Nature of Spin Decoherence of a Polarized Beam of Light Nuclei in a Storage Ring for EDM Search Jetp Lett. (IF 1.3) Pub Date : 2023-11-14 A. A. Melnikov, Yu. V. Senichev, A. E. Aksentyev, S. D. Kolokolchikov
Coherent spin motion is a necessary condition to search for the electric dipole moment of charged particles in a storage ring. The first step to increase the spin coherence time is to turn on a radiofrequency cavity. The next step is to manipulate equilibrium energy levels associated with betatron orbit lengthening and nonlinear momentum compaction factor. Spin resonances act as additional sources
-
Spreading Widths of Giant Monopole Resonance in the Lead Region: Random Matrix Approach Jetp Lett. (IF 1.3) Pub Date : 2023-11-14 N. N. Arsenyev, A. P. Severyukhin, R. G. Nazmitdinov
The microscopic calculation of the decay width of giant monopole resonance (GMR) anticipates the mixing of one-phonon states with configurations of increasing complexity. To this aim we develop the effective approach for description of monopole excited states that are obtained in the quasiparticle random phase approximation (QRPA), with regard of the coupling between one- and two-phonon states. Based
-
Review on Special Geometry and Mirror Symmetry for Calabi–Yau Manifolds (Mini-review) Jetp Lett. (IF 1.3) Pub Date : 2023-11-14 A. Belavin, B. Eremin, S. Parkhomenko
Ten-dimensional Superstring theory unifies the Standard Model of the strong, electromagnetic, and weak interactions with quantum gravity. Starting with 10-dimensional superstring theory, we can get a 4-dimensional theory with spacetime supersymmetry following the Kaluza–Klein idea by compactifying six of the ten dimensions. For phenomenological reasons we need to do this while maintaining N = 1 Supersymmetry
-
Nonlinear Kinetic Inductance Sensor Jetp Lett. (IF 1.3) Pub Date : 2023-11-14 D. Yu. Vodolazov
The concept of nonlinear kinetic inductance sensor (NKIS) of electromagnetic radiation is proposed. The idea is based on divergency of kinetic inductance Lk ~ dq/dI (\(\hbar q\) is a momentum of superconducting electrons, I is a supercurrent) of hybrid superconductor/normal metal (SN) bridge at current I* < Idep (Idep is a depairing current of the hybrid) and temperature T* much smaller than critical
-
Rattling Phonon Modes in Quadruple Perovskites Jetp Lett. (IF 1.3) Pub Date : 2023-11-14 Z. V. Pchelkina, E. V. Komleva, V. Yu. Irkhin, Y. Long, S. V. Streltsov
Rattling phonon modes are known to be the origin of various anomalous physical properties such as superconductivity, suppression of thermal conductivity, enhancement of specific heat etc. By means of DFT + U calculations we directly show the presence of the rattling mode in the quadruple perovskites CuCu3V4O12 and CuCu3Fe2Re2O12 and argue that this might appear in others as well. It is demonstrated
-
Size-dependent One- and Two-photon Fluorescence of Acetonitrile-derived Carbon Dots Jetp Lett. (IF 1.3) Pub Date : 2023-10-30 A. A. Astafiev, A. M. Shakhov, V. A. Nadtochenko
Carbon dots – carbonaceous luminescent nanoparticles – are increasingly employed in bioimaging, fluorescent sensing, photocatalysis, and light emitting devices. The nanoparticle size is the key morphological parameter, affecting optical properties of carbon dots. To study the relation between the size and linear and nonlinear light absorption and luminescence of carbon dots, we separated products obtained
-
Anatomy of the Band Structure of the Newest Apparent Near-ambient Superconductor LuH3 – xNx Jetp Lett. (IF 1.3) Pub Date : 2023-10-30 N. S. Pavlov, I. R. Shein, K. S. Pervakov, V. M. Pudalov, I. A. Nekrasov
Recently it was claimed that nitrogen-doped lutetium hydride exhibited a near-ambient superconducting transition with a temperature of 294 K at a pressure of only 10 kbar, this pressure being several orders of magnitude lower than previously demonstrated for hydrides under pressure. In this paper, we investigate within DFT + U the electronic structure of both parent lutetium hydride LuH3 and nitrogen
-
Dimensionality-Driven Evolution of Electronic Structure and Transport Properties in Pressure-Induced Phases of Ca2N Electride Jetp Lett. (IF 1.3) Pub Date : 2023-10-30 M. A. Mazannikova, Dm. M. Korotin, V. I. Anisimov, A. R. Oganov, D. Y. Novoselov
We investigate how the 2D → 1D → 0D reduction in dimensionality of interstitial electronic states in the Ca2N electride influences its electronic structure and transport properties. Employing the Maximally Localized Wannier Functions (MLWF) approach, we successfully describe the interstitial quasi-atomic states (ISQ) located in non-nuclear Wyckoff positions between Ca atoms. This allowed us to conclude
-
Josephson Dynamics at High Transmissions: Voltage and Current Bias Limits Jetp Lett. (IF 1.3) Pub Date : 2023-10-30 A. V. Galaktionov, A. D. Zaikin
We establish a direct relation between the I – V curves for highly transparent Josephson junctions in the voltage- and current-biased regimes. We demonstrate that the presence of sub-Ohmic dissipation at subgap voltages and temperatures yields the linear dependence of the average voltage \(\bar {V}\) on the bias current I exceeding the critical one Ic, in contrast to the square root dependence \(\bar