Linköping University
Master of Science in Engineering (M., Applied Physics and Electrical Engineering
2010 – 2018
During my time at the university I took a keen interest in mathematics and physics; therefore, I elected a master profile in theory, modelling and visualization. However, before the aforementioned profile I studied in the financial mathematics profile.
RESEARCH, TEACHING, or OTHER INTERESTS
Atomic and Molecular Physics, and Optics, Condensed Matter Physics
Study of spin polarization and spin-related transport in quantum point contacts coupled through a two-dimensional electron reservoir Irina I Yakimenko, Ivan P Yakimenko Journal of Physics Condensed Matter, 2025 Quantum wires and quantum point contacts (QPCs) have been realized in GaAs/AlGaAs heterostructures, where a two-dimensional electron gas (2DEG) resides at the interface between the GaAs and AlGaAs layered semiconductors. This paper presents a theoretical study of electron transport in a device composed of two QPCs connected via a wider two-dimensional (2D) region. The QPCs, defined by split gates, serve as injector and detector of electrons, while the intermediate 2D region the two QPCs can be electrostatically tuned by a top gate. Electron transport is modeled using density functional theory. Experimental observations suggest that, when the injector QPC is asymmetrically biased, the broadening of the current peak detected at the detector QPC may be associated with spin polarization in the injector. Our simulations for both symmetric and asymmetric injector QPCs indicate that the shape of detector current profile does not strongly depend on injector’s asymmetry, however the width of the current distribution varies with the current through injector QPC. This variation is consistent with the presence of spin-related effects, such as the 0.7 ( 2 e 2 / h ) conductance anomaly observed in the injector QPC. These results provide insight into the electronic property of 2DEG in the proposed device and may be useful for the future design of semiconductor structures for spintronics and quantum device applications.
Electronic properties of semiconductor quantum wires for shallow symmetric and asymmetric confinements Irina I Yakimenko, Ivan P Yakimenko Journal of Physics Condensed Matter, 2022 Quantum wires (QWs) and quantum point contacts (QPCs) have been realized in GaAs/AlGaAs heterostructures in which a two-dimensional electron gas resides at the interface between GaAs and AlGaAs layered semiconductors. The electron transport in these structures has previously been studied experimentally and theoretically, and a 0.7 conductance anomaly has been discovered. The present paper is motivated by experiments with a QW in shallow symmetric and asymmetric confinements that have shown additional conductance anomalies at zero magnetic field. The proposed device consists of a QPC that is formed by split gates and a top gate between two large electron reservoirs. This paper is focussed on the theoretical study of electron transport through a wide top-gated QPC in a low-density regime and is based on density functional theory. The electron–electron interaction and shallow confinement make the splitting of the conduction channel into two channels possible. Each of them becomes spin-polarized at certain split and top gates voltages and may contribute to conductance giving rise to additional conductance anomalies. For symmetrically loaded split gates two conduction channels contribute equally to conductance. For the case of asymmetrically applied voltage between split gates conductance anomalies may occur between values of 0.25(2e 2/h) and 0.7(2e 2/h) depending on the increased asymmetry in split gates voltages. This corresponds to different degrees of spin-polarization in the two conduction channels that contribute differently to conductance. In the case of a strong asymmetry in split gates voltages one channel of conduction is pinched off and just the one remaining channel contributes to conductance. We have found that on the perimeter of the anti-dot there are spin-polarized states. These states may also contribute to conductance if the radius of the anti-dot is small enough and tunneling between these states may occur. The spin-polarized states in the QPC with shallow confinement tuned by electric means may be used for the purposes of quantum technology.
Bose–Einstein condensation as a deposition phase transition of quantum hard spheres and new relations between bosonic and fermionic pressures К.А. Bugaev, O.I. Ivanytskyi, B.E. Grinyuk, I.P. Yakimenko Ukrainian Journal of Physics, 2020 We investigate the phase transition of Bose–Einstein particles with the hard-core repulsion in the grand canonical ensemble within the Van der Waals approximation. It is shown that the pressure of non-relativistic Bose–Einstein particles is mathematically equivalent to the pressure of simplified version of the statistical multifragmentation model of nuclei with the vanishing surface tension coefficient and the Fisher exponent тF = 5/2 , which for such parameters has the 1-st order phase transition. The found similarity of these equations of state allows us to show that within the present approach the high density phase of Bose-Einstein particles is a classical macro-cluster with vanishing entropy at any temperature which, similarly to the system of classical hard spheres, is a kind of solid state. To show this we establish new relations which allow us to identically represent the pressure of Fermi–Dirac particles in terms of pressures of Bose–Einstein particles of two sorts.
Basic modelling of effects of geometry and magnetic field for quantum wires injecting electrons into a two-dimensional electron reservoir Ivan P Yakimenko, Irina I Yakimenko, Karl-Fredrik Berggren Journal of Physics Condensed Matter, 2019 High-mobility two-dimensional electron gas (2DEG) which resides at the interface between GaAs and AlGaAs layered semiconductors has been used experimentally and theoretically to study ballistic electron transport. The present paper is motivated by recent experiments in magnetic electron focusing. The proposed device consists of two quantum point contacts (QPCs) serving as electron injector and collector which are placed in the same semiconductor GaAs/AlGaAs heterostructure. Here we focus on a theoretical study of the injection of electrons via a quantum wire/QPC into an open two-dimensional (2D) reservoir. The transport is considered for non-interacting electrons at different transmission regimes using the mode-matching technique. The proposed mode-matching technique has been implemented numerically. Electron flow through the quantum wire with hard-wall rectangular, conical and rounded openings has been studied. We have found for these three cases that the geometry of the opening does not play a crucial role for the electron propagation. When a perpendicular magnetic field is applied the electron paths in the 2D reservoir are curved. We analyse this case both classically and quantum-mechanically. The effect of spin-splitting due to exchange interactions on the electron flow is also considered. The effect is clearly present for realistic choices of device parameters and consistent with observations. The results of this study may be applied in designing magnetic focusing devices and spin separation.
Structure and interfacial properties of phospholipid-containing sponge nanoparticles and their interaction with myoglobin A Luchini, MR Machingauta, S Köhler, J Gilbert, IP Yakimenko, J Birch, ... Journal of Colloid and Interface Science 697, 137879 , 2025 2025 Citations: 2
Optimising Neutron Reflectometry Experiments through Sensitivity-Guided Data Analysis and Substrate Engineering I Yakymenko Linköping University Electronic Press , 2025 2025
Study of spin polarization and spin-related transport in quantum point contacts coupled through a two-dimensional electron reservoir II Yakimenko, IP Yakimenko Journal of Physics: Condensed Matter 37 (32), 325301 , 2025 2025
Electronic properties of semiconductor quantum wires for shallow symmetric and asymmetric confinements II Yakimenko, IP Yakimenko Journal of Physics: Condensed Matter 34 (10), 105302 , 2022 2022 Citations: 18
Bose-Einstein Condensation of Quantum Hard-Spheres as a Deposition Phase Transition and New Relations Between Bosonic and Fermionic Pressures KA Bugaev, OI Ivanytskyi, BE Grinyuk, IP Yakimenko arXiv preprint arXiv:2009.02178 , 2020 2020 Citations: 1
OF PHYSICS FM Hussain, FA Majeed, MH Meteab, BE Grinyuk, IV Simenog, ... 2020
Basic modelling of effects of geometry and magnetic field for quantum wires injecting electrons into a two-dimensional electron reservoir IP Yakimenko, II Yakimenko, KF Berggren Journal of Physics: Condensed Matter 31 (34), 345302 , 2019 2019 Citations: 2
Hadron resonance gas model with induced surface tension VV Sagun, KA Bugaev, AI Ivanytskyi, IP Yakimenko, EG Nikonov, ... The European Physical Journal A 54 (6), 100 , 2018 2018 Citations: 66
Going beyond the second virial coefficient in the hadron resonance gas model KA Bugaev, VV Sagun, AI Ivanytskyi, IP Yakimenko, EG Nikonov, ... Nuclear Physics A 970, 133-155 , 2018 2018 Citations: 41
Modelling of injection of electrons by low-dimensional nanowire into a reservoir I Yakymenko 2018
Hadron resonance gas model for an arbitrarily large number of different hard-core radii KA Bugaev, VV Sagun, AI Ivanytskyi, IP Yakimenko, EG Nikonov, ... arXiv preprint arXiv:1611.07349 , 2016 2016 Citations: 1
MOST CITED SCHOLAR PUBLICATIONS
Hadron resonance gas model with induced surface tension VV Sagun, KA Bugaev, AI Ivanytskyi, IP Yakimenko, EG Nikonov, ... The European Physical Journal A 54 (6), 100 , 2018 2018 Citations: 66
Going beyond the second virial coefficient in the hadron resonance gas model KA Bugaev, VV Sagun, AI Ivanytskyi, IP Yakimenko, EG Nikonov, ... Nuclear Physics A 970, 133-155 , 2018 2018 Citations: 41
Electronic properties of semiconductor quantum wires for shallow symmetric and asymmetric confinements II Yakimenko, IP Yakimenko Journal of Physics: Condensed Matter 34 (10), 105302 , 2022 2022 Citations: 18
Structure and interfacial properties of phospholipid-containing sponge nanoparticles and their interaction with myoglobin A Luchini, MR Machingauta, S Köhler, J Gilbert, IP Yakimenko, J Birch, ... Journal of Colloid and Interface Science 697, 137879 , 2025 2025 Citations: 2
Basic modelling of effects of geometry and magnetic field for quantum wires injecting electrons into a two-dimensional electron reservoir IP Yakimenko, II Yakimenko, KF Berggren Journal of Physics: Condensed Matter 31 (34), 345302 , 2019 2019 Citations: 2
Bose-Einstein Condensation of Quantum Hard-Spheres as a Deposition Phase Transition and New Relations Between Bosonic and Fermionic Pressures KA Bugaev, OI Ivanytskyi, BE Grinyuk, IP Yakimenko arXiv preprint arXiv:2009.02178 , 2020 2020 Citations: 1
Hadron resonance gas model for an arbitrarily large number of different hard-core radii KA Bugaev, VV Sagun, AI Ivanytskyi, IP Yakimenko, EG Nikonov, ... arXiv preprint arXiv:1611.07349 , 2016 2016 Citations: 1
Optimising Neutron Reflectometry Experiments through Sensitivity-Guided Data Analysis and Substrate Engineering I Yakymenko Linköping University Electronic Press , 2025 2025
Study of spin polarization and spin-related transport in quantum point contacts coupled through a two-dimensional electron reservoir II Yakimenko, IP Yakimenko Journal of Physics: Condensed Matter 37 (32), 325301 , 2025 2025
OF PHYSICS FM Hussain, FA Majeed, MH Meteab, BE Grinyuk, IV Simenog, ... 2020
Modelling of injection of electrons by low-dimensional nanowire into a reservoir I Yakymenko 2018
