Article
Nanoscience & Nanotechnology
Michael Tribelsky, Andrey E. Miroshnichenko
Summary: Two analytical models are introduced to describe dynamic effects at resonant light scattering by subwavelength particles, showing that sharp variations in the envelope of the incident pulse can lead to counterintuitive dynamics of the scattering. The models are applied to explain scattering of a square-envelope pulse by an infinite circular cylinder made of GaP, demonstrating intensive sharp spikes in scattering cross-sections.
Article
Physics, Fluids & Plasmas
I. P. Koroleva(Kikot), Yu. A. Kosevich
Summary: This paper investigates the effects of nonlinearity on two-path phonon interference in the transmission through two-dimensional arrays of atomic defects in a lattice. The emergence of transmission antiresonance is demonstrated in the few-particle nanostructures, highlighting the universality of destructive-interference origin in transmission antiresonances. The paper also discusses the generation of higher harmonics and the shift of antiresonance frequency caused by interatomic nonlinearities. The importance and understanding of interference and nonlinearity in phonon propagation through anharmonic atomic defects are emphasized. Rating: 8/10
Article
Materials Science, Multidisciplinary
Andrei Zadorozhnyi, Yuri Dahnovsky
Summary: This study explores the effects of Ned-type skyrmions on conduction electrons in two-dimensional Rashba spin-orbit ferromagnets, uncovering resonance structures in direct and Hall electric conductivities. The resonances are found to depend on skyrmion size, Rashba spin-orbit coupling vector value, and relative direction between magnetization and Rashba vectors. The results demonstrate the potential of utilizing resonance properties for spin transistors.
Article
Chemistry, Multidisciplinary
Youkui Xu, Yingtao Li, Qian Wang, Huanyu Chen, Yutian Lei, Xuefeng Feng, Zhipeng Ci, Zhiwen Jin
Summary: Perovskites, as one of the most promising candidates for X-rays imaging materials, have received extensive attention. However, poor stability and undesirable ion migration hinder their development. In recent years, two-dimensional (2D) perovskite materials have been successfully developed to address these issues, but the preparation of pure phase single crystals remains challenging. This study demonstrates the use of a 2D perovskite single crystal, BA(2)PbBr(4), as a representative model, grown using a simple solution temperature lowering (STL) synthesis method. The crystal exhibits a short fluorescence lifetime, intense X-rays radioluminescence, and high environmental and temperature stability. It has also been used in X-rays imaging, showing good imaging results and stability. This research highlights the great potential of 2D perovskites in low-cost X-rays imaging systems.
MATERIALS CHEMISTRY FRONTIERS
(2022)
Article
Chemistry, Multidisciplinary
Wenbo Wang, Wei Dong, Lingxiao Ji, Yingkai Xia, Shaobin Yang
Summary: In this study, a new method of dissolving g-C3N3 in concentrated sulfuric acid and its solution stability at low temperature were investigated. The findings provide possibilities for the application of g-C3N3 in fields such as photocatalysis, electrochemistry, and energy storage.
CHEMICAL COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Jianjun Zhang, Guojun Zhou, Hio-Ieng Un, Fulu Zheng, Kamil Jastrzembski, Mingchao Wang, Quanquan Guo, David Muecke, Haoyuan Qi, Yang Lu, Zhiyong Wang, Yan Liang, Markus Loeffler, Ute Kaiser, Thomas Frauenheim, Aurelio Mateo-Alonso, Zhehao Huang, Henning Sirringhaus, Xinliang Feng, Renhao Dong
Summary: This study reports a Cu-catecholate wavy 2D c-MOF with metallic transport capability and demonstrates its potential as an electrode material for energy storage.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Physical
Weigang Lu, Blake Birmingham, Dmitri V. Voronine, Drew Stolpman, Sharad Ambardar, Deniz Altunoz Erdogan, Emrah Ozensoy, Zhenrong Zhang, Touradj Solouki
Summary: A simple and efficient method was developed to synthesize two-dimensional aluminum nanocrystals from commercially available aluminum foil, which exhibit surface plasmon resonance in the visible spectral range and can enhance Raman signals for detection. These nanocrystals have the potential for a wide range of optical and sensing applications.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Optics
Friethjof Theel, Simeon Mistakidis, Kevin Keiler, Peter Schmelcher
Summary: We investigate the dynamics of two correlated impurities in a double well coupled to a one-dimensional bosonic medium. By studying the entanglement between the impurities and the medium, as well as the impurities' two-body correlations, we determine the ground-state phase diagram of the system. Our results show that the impurity structures and the intervals of existence strongly depend on the interactions between the impurities and the external confinement of the medium.
Article
Multidisciplinary Sciences
Adria Canos Valero, Hadi K. Shamkhi, Anton S. Kupriianov, Thomas Weiss, Alexander A. Pavlov, Dmitrii Redka, Vjaceslavs Bobrovs, Yuri Kivshar, Alexander S. Shalin
Summary: The authors demonstrate a super dipole resonance that arises from interfering resonant modes in the scattering of light by small particles. They study the Mie-like scattering from a subwavelength resonator made of a high-index dielectric material and uncover a novel mechanism of superscattering linked to bound states in the continuum. They develop a non-Hermitian model to describe interfering resonances and confirm their findings through a scattering experiment.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Tekalign T. Debela, Min Chieh Yang, Christopher H. Hendon
Summary: Compared to dense analogues, high-surface-area metals offer several key advantages in electrocatalysis and energy storage. Metal-organic frameworks (MOFs) have the highest known surface area and can conduct electricity. In this study, the existence of hydrogenic defects in the conductive MOFs is explored and it is found that interstitial hydrogen is a prevalent defect, which renders both Ni3(HITP)2 and Ni3(HIB)2 as bulk semiconductors rather than metals. This highlights the important role of hydrogenic defects in determining the bulk properties of conductive MOFs.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Materials Science, Multidisciplinary
Matthew J. Anderson, Florent Perez, Carsten A. Ullrich
Summary: This study investigates collective spin-wave modes in doped paramagnetic graphene with adjustable Zeeman-type band splitting, utilizing time-dependent spin density functional response theory and considering dynamical exchange and correlation effects. The spin wave dispersions and stiffnesses are obtained as functions of doping and spin polarization, with potential for experimental observation discussed.
Article
Chemistry, Physical
K. Tsuchikusa, K. Yamamoto, M. Katsura, C. T. de Paula, J. A. C. Modesto, S. Dorbolo, F. Pacheco-Vazquez, Y. D. Sobral, H. Katsuragi
Summary: This study investigates the relationship between bidispersity and disorder degree of particle configuration. By introducing bidispersity through magnetic dipole-dipole interaction, the particle system is compressed to obtain a uniform particle arrangement. The disorder degree is evaluated using Voronoi tessellation. The results show that the peak of standard deviation occurs when the numbers of large and small particles are equal and zero skewness can be achieved when the numbers are identical. The analysis also reveals the relationship between Voronoi cell analysis and the global bond orientational order parameter.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Optics
Wei Wang, Fengping Yan, Zhi Wang, Haisu Li, Guifang Wu, Siyu Tan, Xuemei Du, Ting Li, Xiangdong Wang, Hao Guo, Ting Feng
Summary: We present a simple design of a metamaterial absorber (MA) based on a two-dimensional trenched metal meta-grating, which exhibits a single ultra-narrow absorption resonance within a clean background spectrum ranging from 0 to 2 THz. The absorption resonance features a linewidth of 0.4 GHz and a Q factor of 2407, thanks to interference effect and the introduction of an air trench. The MA sensor shows excellent sensing performance with high saturated thickness, maximum sensitivity, and maximum sensing figure of merit.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Chenkun Zhou, Di Wang, Francisco Lagunas, Benjamin Atterberry, Ming Lei, Huicheng Hu, Zirui Zhou, Alexander S. Filatov, De-en Jiang, Aaron J. Rossini, Robert F. Klie, Dmitri V. Talapin
Summary: Researchers have successfully synthesized a family of hybrid MXenes (h-MXenes) that incorporate amido- and imido-bonding between organic and inorganic parts. These h-MXenes combine the tailorability of organic molecules with the electronic connectivity and other properties of inorganic 2D materials, and exhibit superior stability against hydrolysis.
Article
Optics
Benjamin Vennes, Thomas C. Preston
Summary: A model for calculating the quasinormal modes (QNMs) of homogeneous and core-shell spheroidal resonators is proposed in this study. The model is applied to investigate hybrid anapoles, which are radiationless states characterized by an enhancement of the total internal energy.
Article
Physics, Condensed Matter
Eugene Kogan, Vyacheslav M. Silkin
Summary: The paper presents the symmetry labeling of all electron bands in graphene obtained by combining numerical band calculations and analytical analysis based on group theory. The predictions about relative positions of the bands which can be made on the basis of each of the models just using the group theory are complimentary.
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
(2021)
Article
Multidisciplinary Sciences
G. Benedek, M. Bernasconi, D. Campi, I. V. Silkin, I. P. Chernov, V. M. Silkin, E. V. Chulkov, P. M. Echenique, J. P. Toennies, G. Anemone, A. Al Taleb, R. Miranda, D. Farias
Summary: Evidence of Spin Acoustic Surface Plasmons (SASP) in Ni(111) is provided in this study, showing that these plasmons originate from the majority-spin Shockley surface state and represent a new kind of collective quasiparticle. The interaction of SASP with phonons and acoustic surface plasmons leads to a substantial reduction in SASP velocity and avoided crossings with optical surface phonon branches.
SCIENTIFIC REPORTS
(2021)
Editorial Material
Physics, Multidisciplinary
E. E. Krasovskii, R. O. Kuzian
PHYSICAL REVIEW LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Roland Hayn, Te Wei, Vyacheslav M. Silkin, Jeroen van den Brink
Summary: The study reveals that plasmon excitations in anisotropic two-dimensional Dirac systems exhibit anisotropy even at the lowest frequencies, with their properties characterized by two dimensionless material parameters. This strong anisotropy can guide plasmon modes and bring new functionalities to the field of Dirac plasmonics.
PHYSICAL REVIEW MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Eugene Krasovskii
Summary: Angle-resolved photoemission from monolayer and bilayer graphene is studied based on an ab initio one-step theory, showing a strong enhancement of emission intensity around scattering resonances. The effect of photoelectron scattering by the underlying substrate on the polarization dependence of the photocurrent is discussed. Experimental observations of the emission intensity are well reproduced within the dipole approximation.
Article
Chemistry, Multidisciplinary
Alberto Martin-Jimenez, Koen Lauwaet, Oscar Jover, Daniel Granados, Andres Arnau, Vyacheslav M. Silkin, Rodolfo Miranda, Roberto Otero
Summary: Accurate measurement of electronic temperatures in metallic nanostructures is crucial for various technological applications. This study demonstrates that electronic temperature can be accurately determined by the shape of tunnel electroluminescence emission edge in tunnel plasmonic nanocavities, revealing a significant deviation between electronic and lattice temperatures under certain conditions. The results provide insights into the nature of overbias emission in tunnel junctions and offer a new method for determining electronic temperatures and quasiparticle dynamics.
Article
Chemistry, Physical
Vladimir U. Nazarov
Summary: The ionization potential (IP) theorem in Kohn-Sham density functional theory explains the relationship between HOMO energy and the first IP, but it may not hold for mesoscopic systems. Research shows that this could lead to issues with the KS valence band in addressing the work-function problem.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Sara Nilsson, Alvaro Posada-Borbon, Mario Zapata-Herrera, Alice Bastos da Silva Fanta, David Albinsson, Joachim Fritzsche, Vyacheslav M. Silkin, Javier Aizpurua, Henrik Gronbeck, Ruben Esteban, Christoph Langhammer
Summary: This study investigates the role of high-angle grain boundaries in the oxidation of Cu nanoparticles. The sensitivity of the Cu2O shell formation to grain morphology is found to be minimal. Additionally, grain boundaries act as vacancy sinks and nuclei for Kirkendall void formation.
PHYSICAL REVIEW MATERIALS
(2022)
Article
Chemistry, Physical
Vladimir U. Nazarov, Roi Baer
Summary: In the high-frequency limit, we found that the system's linear response cancels out completely when the pulse switches off. Surprisingly, the observables of the system can still be described using a combination of its linear density response function and nonlinear functions of the electric field. Considering the high surface sensitivity of the setup, we propose a new spectroscopic technique, which has the potential to become a powerful characterization method for nanoscience and nanotechnology.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Yury M. Koroteev, Igor V. Silkin, Ivan P. Chernov, Evgueni V. Chulkov, Vyacheslav M. Silkin
Summary: In this work, we investigate the low-energy collective electronic excitations with sound-like dispersion, called acoustic plasmons, in ferromagnetic nickel using ab initio linear-response time-dependent density functional theory. The excitation of these plasmons results in spatial variations in the spin structure in nickel. We further study the variations in the acoustic plasmons properties in NiHx with different hydrogen concentrations.
Article
Chemistry, Multidisciplinary
Eugene Krasovskii
Summary: This study investigates the diffraction of photoelectrons emitted from the core 1s and valence band of monolayer and bilayer graphene based on the one-step theory of photoemission. The energy-dependent angular distribution of the photoelectrons is compared to simulated electron reflection patterns of low-energy electron diffraction experiments. The results demonstrate the observable constant energy contours and the well-reproduced experimental shape of photoelectron diffraction, including the scattering resonances and the effect of subsurface layer scattering in bilayer graphene. The study also reveals that photoemission and low-energy electron diffraction patterns provide essentially the same information about the long-range order and can be equally suitable for diffraction analysis.
Article
Chemistry, Physical
Vladimir U. Nazarov, Roi Baer
Summary: This article investigates the response of an arbitrary quantum mechanical system to a finite duration pulsed electromagnetic radiation. It is found that the system's linear response cancels out completely when the pulse switches off, but the observables can still be described using a combination of linear density response function and nonlinear functions of the electric field. Analysis of jellium slab and jellium sphere models reveals a high surface sensitivity, resulting in a richer excitation spectrum compared to the conventional linear response regime. Based on this, a new spectroscopic technique called Nonlinear High-Frequency Pulsed Spectroscopy (NLHFPS) is proposed.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Chemistry, Physical
Unai Muniain, Vyacheslav M. Silkin
Summary: This study investigates the effect of band structure anisotropy on the electronic collective excitations in a two-dimensional electron gas. The researchers find that the dynamical dielectric response strongly depends on the direction of in-plane momentum transfer, resulting in different numbers of excitations with similar to root q and similar to q energy dispersions. This finding is in contrast to the conventional case of isotropic band dispersion where only a single plasmon can exist with similar to root q dispersion.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
T. Karabassov, A. A. Golubov, V. M. Silkin, V. S. Stolyarov, A. S. Vasenko
Summary: Superconducting hybrid structures with topological order and induced magnetization show potential for fault-tolerant quantum computation. However, the interplay between magnetization and topological insulator surface properties, known as spin-momentum locking, on the superconducting proximity effect needs further investigation. Results from studying a 2D superconductor/topological insulator junction with helical magnetization on the topological insulator surface show nonmonotonic dependence of critical temperature on thickness, whether the magnetization evolves along or perpendicular to the interface. These findings are valuable for designing novel superconducting nanodevices and understanding superconductivity in systems with nonuniform magnetization.
Article
Materials Science, Multidisciplinary
I. A. Nechaev, E. E. Krasovskii
Summary: This study presents an ab initio relativistic k . p theory on the impact of magnetic exchange fields on the band structure of bulk crystals and thin films of three-dimensional layered topological insulators. It reveals unconventional scenarios and responses to magnetization, depending on the spin and angular momentum of valence and conduction states. By constructing a minimal four-band third-order k . p model, the study analyzes the field-induced band structure and identifies Weyl nodes, showing how different scenarios can affect the topological properties of the modified band structure.
