Article
Physics, Multidisciplinary
Yin Chen, Xiao-Yin Pan, Yu-Qi Li
Summary: This study investigates the transmission coefficient of an electron through a quantum point contact in a tilted magnetic field and a crossed electric field. The widely employed Fertig and Halperin model is extended to consider cases where certain conditions are not met, and the effects of electric and magnetic fields on the transmission coefficient are discussed. The study also explores the magnetic effects on the constriction conductance for the extended model.
Review
Physics, Multidisciplinary
Kazuya Terabe, Takashi Tsuchiya, Tohru Tsuruoka
Summary: The atomic scale switch utilizes the transport and chemical reaction of ions in a solid to change the properties of materials. By applying voltage, the transport of ions and electrochemical reactions can be controlled, allowing for fast switching and transition between quantized conductance states.
ADVANCES IN PHYSICS-X
(2022)
Article
Chemistry, Multidisciplinary
Simon Munyan, Arman Rashidi, Alexander C. Lygo, Robert Kealhofer, Susanne Stemmer
Summary: In this study, edge modes in the 2D TI phase of Cd3As2 are characterized using a quantum point contact device, and their controllable transmission is investigated, which is crucial for future applications in quantum interference devices.
Article
Chemistry, Multidisciplinary
Andriy Savytskyi, Alexander Pospelov, Anna Herus, Volodymyr Vakula, Nataliya Kalashnyk, Eric Faulques, Gennadii Kamarchuk
Summary: A portable device for researching and manufacturing dendritic Yanson point contacts and quantum sensing was developed. The device allows for the creation of these contacts and the study of their quantum properties, which are evident in the electrochemical cyclic switchover effect. The device can gather data on the compositions and characteristics of synthesized substances, as well as provide information on the electrochemical and electrophysical processes involved.
Article
Physics, Multidisciplinary
H. E. Camblong, A. Chakraborty, W. S. Daza, J. E. Drut, C. L. Lin, C. R. Ordonez
Summary: The study focuses on a one-dimensional system of two-species fermions with an attractive derivative-delta type two-body interaction, showcasing scale anomaly and power-law behavior. By using both Schrodinger equation and quantum field theory, the research examines bound and scattering states, revealing consistency between the two approaches. The impact of quantum anomaly on the binding energy and universal relations is explored, emphasizing conceptual and structural aspects of the problem.
Article
Chemistry, Multidisciplinary
Kazuyuki Kuroyama, Jinkwan Kwoen, Yasuhiko Arakawa, Kazuhiko Hirakawa
Summary: This study demonstrates electrical access to an ultrastrongly coupled system by fabricating a gate-defined quantum point contact near a terahertz split-ring resonator. The observed photocurrent spectrum with significant anticrossing is attributed to coupling between the cyclotron resonance of the two-dimensional electrons and the resonator. The photocurrent signal is explained by energy-selective transmission/reflection of the quantum Hall edge channels at the quantum point contact.
Article
Chemistry, Physical
Xin Xue, Fobao Huang, Gongwei Hu
Summary: This article introduces a spin-polarized device based on ZnO/CdO wurtzite topological quantum well structure. By adjusting the width of the quantum point contact, both the lateral spin-orbit coupling and the band gap of the edge states can be controlled, resulting in spin-polarized conductance oscillation. When the QPC width is greater than 50 nm, the spin splitting of the edge states is suppressed, leading to an extremely long spin precession length. This approach provides a new electrical method to manipulate spin-polarized electron transport in topological wurtzite systems.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Chemistry, Physical
Xin Xue, Fobao Huang, Gongwei Hu
Summary: Manipulating spin polarization in wide-gap wurtzite semiconductors is crucial for high-temperature spintronics applications. A topological insulator recently discovered in wurtzite quantum wells offers a platform for spin-polarized transport through polarization field-driven topological edges and large Rashba spin-orbit coupling. This study proposes a spin-polarized device in a quantum point contact structure based on ZnO/CdO wurtzite topological quantum wells. The results demonstrate that the width of the quantum point contact can control lateral spin-orbit coupling and the band gap of edge states through the quantum size effect. This width-dependent lateral spin-orbit coupling effect provides an emerging electrical approach to manipulate spin-polarized electron transport in topological wurtzite systems.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Chemistry, Physical
Guanbo Min, Yang Xu, Peter Cochran, Nikolaj Gadegaard, Daniel M. Mulvihill, Ravinder Dahiya
Summary: This research reveals that the performance of triboelectric nanogenerators is related to the real contact area, with increasing contact pressure leading to higher electrical output. These findings are significant for TENG design, defining tribo-charge density, and the potential use of TENGs as self-powered sensors.
Article
Physics, Multidisciplinary
C. R. da Cunha, N. Aoki, D. K. Ferry, A. Velasquez, Y. Zhang
Summary: Scanning gate microscopy (SGM) is a valuable technique for characterizing electronic transport in mesoscopic systems. In this work, an empirically-constrained optimization approach based on swarm search and Green's functions is proposed to extract more information from SGM measurements. The approach is applied to a quantum point contact, and the results reveal the potential landscape experienced by free electrons in mesoscopic systems.
PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS
(2023)
Article
Mechanics
I Sevostianov, M. Kachanov
Summary: This study examines the incremental normal compliance of an irregular contact between two elastic half spaces, modeling the contact as an external crack. By utilizing an approximate expression for stress intensity factor and Rice's theorem, the crack compliance is evaluated. The results are applicable to a wide range of contact shapes and include the formulation of bounds similar to Hill's comparison theorem. Additionally, the study explores the relationship between elasticity and conductivity in contact conductance.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2021)
Article
Chemistry, Physical
Shivam Gupta, Jatin Soni, Awneesh Kumar, Taraknath Mandal
Summary: This study shows, using molecular dynamics simulations, that the structural and mechanical properties of binary lipid mixtures change nonlinearly with lipid mole fractions, and the strength of this nonlinearity depends on the spontaneous curvature difference and locally inhomogeneous interactions between the lipid components.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Physics, Condensed Matter
Sushil Kumar Sahu, Abhiram Soori
Summary: The conductance of metallic heterostructures can be controlled by a gate voltage, leading to oscillations in the conductance versus chemical potential plot. This can be explained by Fabry-Perot interference. In this study, we investigate the DC Josephson effect in superconductor-normal metal-superconductor junctions, where the chemical potential in the normal metal region can be tuned by a gate voltage. Numerical calculations reveal the presence of Andreev bound states within the superconducting gap, and the Josephson current oscillates as a function of the chemical potential, consistent with Fabry-Perot interference. Furthermore, the Josephson current carried by one bound state may be higher than that carried by two or more bound states.
EUROPEAN PHYSICAL JOURNAL B
(2023)
Article
Physics, Multidisciplinary
Hao-Nan Cui, Ze-Nan Wu, Jian-Kun Wang, Guang-Yu Zhu, Jia-Jie Yang, Wen-Zhuang Zheng, Zhi-Min Liao, Shuo Wang, Ben-Chuan Lin, Dapeng Yu
Summary: This study reports a novel nonlinear behavior of chiral anomaly in the Dirac semimetal Cd3As2, characterized by resistance-increasing and current source-strengthening properties at an intermediate magnetic field of approximately 5 T. Trivial factors such as thermal effects, geometric artifacts, and anisotropy were ruled out through angle-dependence experiments. Additionally, non-Ohmic electric quantum oscillations were observed when a high direct current of 300 μA was applied, suggesting the formation of quantized levels due to Bloch oscillation in the high DC regime.
Article
Physics, Multidisciplinary
Stylianos Varchanis, Dionisis Pettas, Yannis Dimakopoulos, John Tsamopoulos
Summary: The surface distortions on polymer melt extrudates, known as sharkskin instability, are believed to be caused by intense stretching and subsequent recoil of polymer chains. A simple physical model predicts a transition from smooth to wavy extrudate, eventually leading to elastic turbulence under creeping flow. The observed flow profiles during polymer melt extrusion exhibit all characteristics predicted by the model.
PHYSICAL REVIEW LETTERS
(2021)
Article
Polymer Science
Igor Zozoulenko, Juan Felipe Franco-Gonzalez, Viktor Gueskine, Aleksandar Mehandzhiyski, Mohsen Modarresi, Nicolas Rolland, Klas Tybrandt
Summary: In summary, PEDOT stands out among conducting polymers for its exceptional conductivity, stability, and processability in organic electronics. However, the field lacks theoretical support with most research focusing solely on experimental aspects. Filling the knowledge gaps in theoretical understanding of PEDOT is crucial for advancing the field and improving the design of materials and devices.
Article
Chemistry, Physical
Ihor Sahalianov, Mehmet Girayhan Say, Oliya S. Abdullaeva, Fareed Ahmed, Eric Glowacki, Isak Engquist, Magnus Berggren, Igor Zozoulenko
Summary: The energy storage technology utilizing conducting polymers in combination with natural materials shows promise for sustainable development. This study investigates the charge storage mechanism in power paper composed of PEDOT and cellulose nanofibrils, revealing that the capacitance derives from electrostatic molecular double layers formed at atomistic scales between holes in the PEDOT backbone and their counterions. The experimental and theoretical approaches provide insight into optimizing performance and design of energy storage devices utilizing conducting polymer electrodes.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Sepideh Zokaei, Donghyun Kim, Emmy Jarsvall, Abigail M. Fenton, Albree R. Weisen, Sandra Hultmark, Phong H. Nguyen, Amanda M. Matheson, Anja Lund, Renee Kroon, Michael L. Chabinyc, Enrique D. Gomez, Igor Zozoulenko, Christian Muller
Summary: Molecular doping of polythiophene with oligoethylene glycol side chains significantly enhances both the electrical and mechanical properties of the polymer. This doping method influences the glass transition temperature and pi-stacking of the polymer, with multivalent counterions showing little effect on stiffness at comparable oxidation levels. These findings suggest that molecular doping is a powerful tool for designing mechanically robust conducting materials for flexible and stretchable electronics.
MATERIALS HORIZONS
(2022)
Article
Chemistry, Multidisciplinary
Oliya S. Abdullaeva, Ihor Sahalianov, Malin Silvera Ejneby, Marie Jakesova, Igor Zozoulenko, Sara I. Liin, Eric Daniel Glowacki
Summary: A microfabricated ROS modulation device based on controlled faradaic reactions was developed in this research. The device can generate tunable gradients of peroxide and oxygen concentrations, enabling controlled H2O2 delivery. The prototype devices were tested by modulating human H2O2-sensitive channels to demonstrate the potential of PEDOT as an H2O2 delivery system.
Article
Chemistry, Multidisciplinary
Jennifer Y. Gerasimov, Arnab Halder, Abdelrazek H. Mousa, Sarbani Ghosh, Padinhare Cholakkal Harikesh, Tobias Abrahamsson, David Bliman, Jan Strandberg, Matteo Massetti, Igor Zozoulenko, Daniel T. Simon, Magnus Berggren, Roger Olsson, Simone Fabiano
Summary: Organic electrochemical transistors formed by in operando electropolymerization are recognized as a simple and effective implementation of synapses in neuromorphic hardware. This study investigates the interface between the substrate and monomer precursors, showing that monomer adsorption to the substrate increases the effective monomer concentration at the surface. The control of interactions between substrate and monomer precursor is crucial for the growth of polymer films, especially for fabricating synaptic systems on inexpensive, flexible substrates.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Materials Science, Paper & Wood
Jiu Pang, Aleksandar Y. Mehandzhiyski, Igor Zozoulenko
Summary: The study presents a new cellulose nanocrystal (CNC) model based on Martini 3, reproducing experimental measurements and improving upon previous CNC models. Surface modifications and interactions with Na+ ions were investigated, along with the study of colloidal stability with varied NaCl concentrations, showing good agreement with experimental results. This work brings new progress towards CNC modelling for describing different surface modifications and colloidal solutions.
Article
Materials Science, Multidisciplinary
Khalil Chennit, Najmeh Delavari, Samia Mekhmoukhen, Rassen Boukraa, Laure Fillaud, Samia Zrig, Nicolas Battaglini, Benoit Piro, Vincent Noel, Igor Zozoulenko, Giorgio Mattana
Summary: This article presents the first example of inkjet-printed, electrolyte-gated organic field-effect transistors fabricated on flexible polyimide substrates. The performance of inkjet-printed, coplanar devices is compared to those of transistors with a metallic wire gate electrode. Good quantitative agreement is achieved between simulation and experiments, indicating the potential use of NPP simulations as predictive tools for device design and optimization. This study opens up avenues for the development of low-cost, flexible sensors and circuits.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Materials Science, Multidisciplinary
Sandra Hultmark, Mariavittoria Craighero, Sepideh Zokaei, Donghyun Kim, Emmy Jarsvall, Furqan Farooqi, Sara Marina, Renee Kroon, Jaime Martin, Igor Zozoulenko, Christian Muller
Summary: This study investigates the interplay between the nanostructure, electrical properties, and mechanical properties of a doped polythiophene with oligoether side chains. It is found that the degree of order of the polymer significantly varies with the co-processing of bistriflimidic acid (H-TFSI). The addition of intermediate concentrations of H-TFSI leads to a high degree of pi-stacking, while strongly oxidized material shows structural disorder. The electrical conductivity and Young's modulus increase upon the addition of 4-10 mol% of H-TFSI, but the loss of pi-stacking has a more significant effect on the latter.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Chemistry, Applied
Patrick Heasman, Aleksandar Y. Mehandzhiyski, Sarbani Ghosh, Igor Zozoulenko
Summary: Processing natural cellulose requires dissolution and regeneration. The crystallinity of re-generated cellulose does not match that of native cellulose, and the physical and mechanical properties of re-generated cellulose vary depending on the technique used. Molecular dynamics simulations were performed to simulate the regeneration of order in cellulose. The simulations show that cellulose chains have an affinity to align with each other on the nanosecond scale, but the end results still lack sufficient order. The time factor plays a major role in reclaiming the order of crystalline cellulose.
CARBOHYDRATE POLYMERS
(2023)
Article
Chemistry, Applied
Jiu Pang, Aleksandar Y. Mehandzhiyski, Igor Zozoulenko
Summary: In this study, we used Martini 3 molecular dynamics simulations to investigate the regeneration of cellulose at a scale comparable to experiments. The structural changes and formation of cellulose sheets and crystallites were monitored using X-ray diffraction (XRD) curves. Our results show that the calculated coarse-grained morphologies of regenerated cellulose are transformed to cellulose II, which is in good agreement with experimental observations.
CARBOHYDRATE POLYMERS
(2023)
Article
Chemistry, Physical
Tahereh Sedghamiz, Aleksandar Y. Mehandzhiyski, Mohsen Modarresi, Mathieu Linares, Igor Zozoulenko
Summary: In this paper, a coarse-grained molecular dynamics (MD) model for PEDOT:PSS is developed and used to calculate the diffusion coefficients and ion distribution in the film. The study finds that the diffusion coefficients for Na+ ions in PEDOT-rich and PSS-rich regions are almost the same and are not sensitive to the oxidation level. Based on this and the simulation results, the commonly accepted granular morphological model of PEDOT:PSS is revised to include a network of pores for ion diffusion.
CHEMISTRY OF MATERIALS
(2023)
Article
Chemistry, Physical
Najmeh Zahabi, Glib Baryshnikov, Mathieu Linares, Igor Zozoulenko
Summary: This study develops a computational technique based on ab initio Car-Parrinello molecular dynamics to trace the temporal motion of charge carriers in the conducting polymer PEDOT. The researchers find that at low temperature, the distortion of the charge carrier gradually disappears and reappears near the position of the counterion. At room temperature, the distortion induced by the charge carrier and atomic vibrations are of similar magnitude, making it challenging to track the charge carrier distortion.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Nanoscience & Nanotechnology
Aleksandar Y. Mehandzhiyski, Emile Engel, Per A. Larsson, Giada Lo Re, Igor V. Zozoulenko
Summary: Cellulose is a promising alternative to synthetic polymers in the development of sustainable and environmentally friendly materials. However, it cannot be melt-processed like many synthetic polymers. Chemical modification, such as dialcohol cellulose, can improve its thermoplasticity. A molecular dynamics study of dialcohol cellulose nanocrystals with different degrees of modification reveals that stress, interfacial stiffness, hydrogen-bond network, and cellulose conformations during mechanical shearing are highly dependent on the degree of modification, water layers, and temperature. Experimental investigation shows that increasing the degree of modification and/or water content makes the melt processing of dialcohol cellulose easier, which aligns with the conclusions from the molecular modeling.
ACS APPLIED BIO MATERIALS
(2022)
Article
Chemistry, Physical
Mohsen Modarresi, Igor Zozoulenko
Summary: Poly(3,4-ethylenedioxythiophene) : polystyrene sulfonate (PEDOT : PSS) is one of the most important conducting polymers, and its electrical conductivity can be significantly enhanced by solvent treatment and pi-pi stacking.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Chemistry, Physical
Scott T. Keene, Viktor Gueskine, Magnus Berggren, George G. Malliaras, Klas Tybrandt, Igor Zozoulenko
Summary: Efficient transport of both ionic and electronic charges in conjugated polymers has enabled a wide range of novel electrochemical devices. This Perspective provides an overview of the fundamental physical processes underlying the operation of mixed conducting polymer devices and highlights recent advances in this field. Challenges in further extending the understanding of MCP-based device operation are identified. A deeper understanding of the elementary processes governing operation in MCPs will drive materials design and device performance advancement.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
