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Experimental Observation of Bound States of 2D Dirac Electrons at Surface Steps of the Topological Insulator Bi2Se3
Physica Status Solidi - Rapid Research Letters. 2019. Vol. 13. No. 5. Article 1800617 .
Fedotov N., Zaitsev-Zotov S.
Topologically protected surface states of three-dimensional topological insulators provide a model framework for studying massless Dirac electrons in two dimensions. Usually a step on the surface of a topological insulator is treated as a scatterer for the Dirac electrons, and the study of its effect is focused on the interference of the incident and scattered electrons. Then a major role plays the warping of the Dirac cone far from the Dirac point. The existence of another significant effect near the Dirac point brought about by the presence of steps is experimentally demonstrated here. Namely the band bending in the vicinity of steps leads to formation of 1D bound states in the corresponding potential wells. The observation of bound states in such potential wells in our scanning tunneling microscopy and spectroscopy investigation of the surface of the topological insulator Bi2Se3 is reported. Numerical simulations support our conclusion and provide a recipe for the identification of such states.
Dmitriev A., Kornilov V., Batienkov R., Lecture Notes in Civil Engineering 2026 Vol. 886 P. 249–255
Numerous studies have provided compelling evidence that the probability distribution of avalanche sizes follows a power law, and that 1/f noise is present in the stochastic dynamics of landslides. We present a theoretical explanation of these phenomena within the framework of self-organized criticality theory, proposing a discrete-time model in the form of a sandpile cellular ...
Added: October 13, 2026
Dmitriev A., Shulman I., Lebedev A., Studies in Computational Intelligence 2026 Vol. 1265 P. 266–273
A discrete-time model is presented for the self-organization of the X/Twitter social network to the edge of a phase transition, characterized by avalanche-like propagation of information in the network. The model is based on the analogy between the critical dynamics of the X social network and sandpile cellular automata with Manna rule on the Chung-Lu ...
Added: October 13, 2026
Arutyunov K., Kharitonov I. A., Petrosyants K. O., JETP Letters 2026 Vol. 124 No. 6 P. 1–16
Superconducting properties of metallic micro- and nanowires can be entirely different from those of bulk superconductors. Of particular interest is the nonequilibrium current-induced state of a quasi-one-dimensional superconducting channel. The most interesting phenomenon here is the stepped I–V characteristic, explained by a process known as phase slip center activation. If the origin of such step-like ...
Added: October 13, 2026
Makarov D. M., Kalikin N., Fashchevsky K. A. et al., Electrochimica Acta 2026 Vol. 579 Article 150159
Machine learning (ML) has become a powerful tool for accelerating the development of carbon-based supercapacitors;
however, most published models assume that a single predictive framework can describe both conventional
porous carbons and hybrid carbon electrodes. Here, we test this assumption using a comprehensive
benchmark dataset and an extended literature-curated dataset enriched with synthesis- and electrolyte-related
descriptors. Three ML algorithms ...
Added: October 13, 2026
Махлуф М., Ozhegov R., Elezov M. et al., Фотоника 2026 Vol. 20 No. 6 P. 414–423
This paper compares the ranging precision of direct time-of-flight (dToF) and non-line-of-sight (NLOS) LiDAR architectures, both using a superconducting nanowire single-photon detector (SNSPD). Both systems operate at 1550 nm with a 50 ps pulsed laser and time-correlated single-photon counting (TCSPC). The dToF configuration achieved approximately 100 µm precision at 10 m, while the NLOS configuration achieved 500 µm precision for ...
Added: October 12, 2026
Singapore: Springer, 2026.
This volume presents the Proceedings of the 34th IUPAP Conference on Computational Physics (CCP2023), held in Kobe, Japan on August 4–8, 2023. It offers a collection of peer-reviewed articles that highlight recent developments in computational and simulation research across various areas of physics. Key topics include the use of data science, quantum computing, and machine ...
Added: October 12, 2026
Goncharov A., Chibisov A., Advanced Theory and Simulations 2023 Vol. 12 No. 13 Article 2200816
Designing stable quantum computers with the ability to correct errors responsibly requires a detailed understanding of the physical processes that underlie these devices. In this study, detailed quantum mechanical simulations of the atomic structure, charge distribution of electron density, and distribution and orientation of magnetic and quantum states as a function of applied external pressure ...
Added: October 11, 2026
Chibisov A., Gnidenko A., Chibisova M. et al., FlatChem 2023 Vol. 41 Article 100533
Manufacturing precise quantum computers with small errors in quantum operations, long coherence times, and low power consumption is the most important challenge in modern nanoelectronics. To understand the operating modes of such calculators in detail, both the optimal arrangement of the qubit system within the structure and changes in its magnetic properties must be comprehensively ...
Added: October 11, 2026
Denis K., Lavrukhina E. A., Journal of Physics: Conference Series 2021 Vol. 2103 Article 012201
A model of quasistationary states is constructed for the one-dimensional edge states propagating along the edge of a two-dimensional topological insulator based on HgTe/CdTe quantum well in the presence of magnetic barriers with finite transparency. The lifetimes of these quasistationary states are found analytically and numerically via different approaches including the solution of the stationary ...
Added: September 6, 2026
Denis K., Konakov A. A., Lavrukhina E. A., Journal of Physics: Condensed Matter 2022 Vol. 34 Article 405302
A model of bound state formation from the delocalized edge states of 2D topological insulator (TI) is derived by considering the effects of magnetic barriers attached to the edge of the HgTe/CdTe quantum well. The resulting structure has a spatial form of 1D quantum dot (QD) with variable number of bound states depending on barrier ...
Added: September 6, 2026
Lukmanova R.M., Cohn I.A., Minakova V. E. et al., Physical Review B: Condensed Matter and Materials Physics 2025 Vol. 111 No. 22 Article 224510
The magnetoresistance of superconductor–topological insulator–superconductor structures, with indium as the superconductor and TaSe3 as the topological insulator, shows steplike features on the resistance under magnetic fields. These resistance steps result from the suppression of superconductivity, induced by the superconducting proximity effect in both the bulk and surface states of the topological insulator. The position and ...
Added: March 11, 2026
Karabassov T., Bobkova I. V., Pavel M. Marychev et al., Beilstein Journal of Nanotechnology 2025 Vol. 17 P. 15–23
The diode effect in superconducting materials has been actively investigated in recent years. Plenty of different devices have been proposed as a platform to observe the superconducting diode effect. In this work, we discuss the possibility of a highly efficient superconducting diode design with controllable polarity. We propose a mesoscopic device that consists of two ...
Added: December 22, 2025
Flammini R., Hogan C., Colonna S. et al., Applied Physics Reviews 2025 Vol. 12 No. 1 Article 011336
Antimonene, the two-dimensional phase of antimony, appears in two distinct allotropes when epitaxially grown on Bi2Se3: the puckered asymmetric washboard (alpha) and buckled honeycomb (beta) bilayer structures. As-deposited antimony films exhibit varying proportions of single alpha and beta structures. We identify the conditions necessary for ordered, pure-phase growth of single to triple beta-antimonene bilayers. Additionally, ...
Added: September 6, 2025
T. V. Pavlova, Journal of Chemical Physics 2025 Vol. 162 No. 19 P. 194701–194701
Added: June 27, 2025
Piasotski K., Lesser O., Reich A. et al., Physical Review B: Condensed Matter and Materials Physics 2025 Vol. 111 No. 17 Article 174527
Recent experiments on planar superconductor-topological insulator-superconductor (S-TI-S) junctions, e.g., in the Corbino geometry, have reported low-temperature nonzero Josephson currents in states with integer fluxoid (flux) induced in the junction by a perpendicular magnetic field. This effect was discussed in connection with Majorana zero modes localized in Josephson vortices of such junctions. Here, we provide an ...
Added: May 27, 2025
N.I. Fedotov, Maizlakh A. A., V.V. Pavlovskiy et al., Surfaces and Interfaces 2022 Vol. 31 Article 102015
Bi2Te3 is a material with high efficiency of thermoelectric energy conversion. Recently, it was also recognized as a topological insulator, and is often used as the basis for creation of other types of topological matter. Pulsed laser deposition (PLD) is widely considered as a simple method for growing of multicomponent films, but not as a ...
Added: January 31, 2024
Aladyshkin A. Y., Journal of Physical Chemistry C 2023 Vol. 127 No. 27 P. 13295–13301
Local structural and electronic properties of thin Pb(111) films grown on Si(111)7x7 surface are experimentally studied by means of low-temperature scanning tunneling microscopy and spectroscopy (STM/STS). It is shown that the visible height h of the monatomic step on Pb(111) surface demonstrates oscillatory dependence on bias voltage U. The period of these oscillations coincides with the period ...
Added: July 13, 2023
Backens S., Shnirman A., Makhlin Y., JETP Letters 2022 Vol. 116 No. 12 P. 891–895
We consider Majorana zero modes in a Josephson junction on top of a topological insulator in transverse magnetic field. Majorana zero modes reside at periodically located nodes of Josephson vortices. We find that hybridization of these modes is prohibited by symmetries of the problem at vanishing chemical potential, which ensures better protection of zero modes ...
Added: December 10, 2022
Галиуллин А. А., Соболевский О. А., Михайлов Н. Н. et al., В кн.: XXIV Уральская международная зимняя школа по физике полупроводников.: Институт физики металлов им. М.Н. Михеева УрО РАН, 2022. С. 153.
Демонстрируется влияние длины края двумерного топологического изолятора на основе квантовой 8 нм ямы HgTe на нелокальный транспорт. Предложена и реализована геометрия структуры типа длинного края. Показано, что вклад длинного края в кондактанс мал по сравнению с вкладом короткого края. Данная геометрия позволяет полностью поляризовать ток по спину. ...
Added: December 7, 2022
Karabassov T., Bobkova I. V., Golubov A. et al., Physical Review B: Condensed Matter and Materials Physics 2022 Vol. 106 No. 22 Article 224509
It is well-known that the ground state of homogeneous superconducting systems with spin-orbit
coupling (SOC) in the presence of the Zeeman field is the so-called helical state, which is characterized
by the phase modulation of the order parameter, but zero supercurrent density. In this work
we investigate the realization of the helical state in a hybrid system with ...
Added: November 24, 2022
Pudalov V., Сахин В. О., Куковицкий Е. Ф. et al., Письма в Журнал экспериментальной и теоретической физики 2022 Т. 115 № 4 С. 270–276
The formation of nanosized charge droplets in the bulk of a three-dimensional topological insulator
Bi1.08Sn0.02Sb0.9Te2S was evidenced using electron spin resonance. Since electrons and holes are “locked” in
these droplets far apart from each other, their participation in bulk conductivity is possible only due to thermal
activation or to variable range hopping. Our transport measurements give evidence that ...
Added: November 16, 2022
Putilov A. V., Di Giorgio C., Vadimov V. L. et al., Physical Review B: Condensed Matter and Materials Physics 2019 Vol. 99 Article 144514
Low-temperature scanning tunneling microscopy and spectroscopy has been used to image the vortex core and the vortex lattice in FeSe single crystals. The local tunneling spectra acquired at the center of elliptical vortex cores display a strong particle-hole asymmetry with spatial oscillation, characteristic of the quantum-limit vortex core. Furthermore, a quasihexagonal vortex lattice at low ...
Added: September 15, 2022
Aladyshkin A. Y., Journal of Physics: Condensed Matter 2020 Vol. 32 Article 435001
Quantum-confined electronic states such as quantum-well states (QWS) inside thin Pb(111) films and modified image-potential states (IPS) above the Pb(111) films grown on Si(111)7×7 substrate were studied by means of low-temperature scanning tunnelling microscopy (STM) and spectroscopy (STS) in the regime of constant current I. By plotting the position of the n-th emission resonances U_n ...
Added: September 15, 2022
Aladyshkin A. Y., Schouteden K., Journal of Physical Chemistry C 2022 Vol. 126 No. 31 P. 13341–13348
Field-emission resonances (FERs) for two-dimensional Pb(111) islands grown on Si(111)7x7 surfaces were studied by low-temperature scanning tunneling microscopy and spectroscopy (STM/STS) in a broad range of tunneling conditions with both active and disabled feedback loop. These FERs exist at quantized sample-to-tip distances Z_n above the sample surface, where n is the serial number of the ...
Added: September 14, 2022