Article
Materials Science, Multidisciplinary
Anudeepa Ghosh, Mainak Palit, Sujan Maity, Vivek Dwij, Sumesh Rana, Subhadeep Datta
Summary: Temperature-dependent Raman spectroscopic studies on FePS3 reveal spin-phonon coupling, spin ordering, and magnon excitation phenomena as temperature decreases. Raman spectroscopy can predict the magnetic transition temperature of magnetic insulators and track magnon transport in heterostructures involving different electronic and magnetic orderings.
Article
Multidisciplinary Sciences
Thuc T. Mai, Kevin F. Garrity, Amber McCreary, Joshua Argo, Jeffrey R. Simpson, Vicky Doan-Nguyen, Rolando Valdes Aguilar, Angela R. Hight Walker
Summary: Magnetic excitations in van der Waals materials, particularly in the 2D limit, have been studied using temperature-dependent magnetoRaman spectroscopy. The researchers identified hybridization of two-magnon excitations with two phonons in manganese phosphorus triselenide, and constructed a model to explain the observations. This work demonstrates the strong hybridization between phonons and a two-magnon continuum, providing insight into interactions in 2D magnetic materials.
Article
Materials Science, Multidisciplinary
Kisung Kang, David G. Cahill, Andre Schleife
Summary: In this paper, a comprehensive theoretical description of antiferromagnetic L10-type MnPt is established using density functional theory, the Korringa-Kohn-Rostoker formalism, and a Heisenberg model. The simulations show that the contribution of the magnetic dipole interaction to the magnetocrystalline anisotropy energy is comparable to the spin-orbit contribution. Furthermore, the lowest magnon frequency and THz spin dynamics in this material are predicted.
Article
Materials Science, Multidisciplinary
Emil Vinas Bostroem, Tahereh Sadat Parvini, James W. McIver, Angel Rubio, Silvia Viola Kusminskiy, Michael A. Sentef
Summary: The study introduces a new method for generating directed magnon currents in honeycomb antiferromagnetic insulators using circularly polarized light, enabled by two-magnon Raman scattering. Experimental results show that the magnon current can be controlled by the polarization and angle of incidence of the laser. Detection through sizable inverse spin Hall voltages in platinum contacts is proposed.
Article
Chemistry, Physical
Yu-Jia Sun, Jia-Min Lai, Si-Min Pang, Xue-Lu Liu, Ping-Heng Tan, Jun Zhang
Summary: By utilizing near-resonant magneto-Raman spectroscopy, the magnon-phonon coupling in FePS3 is investigated under a relatively small magnetic field. The results show the coupling effects between magnons and phonons, including frequency anti-crossing coupling and polarization transferring between coupled modes.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Quang To, Zhengtianye Wang, Yongchen Liu, Weipeng Wu, M. Benjamin Jungfleisch, John Q. Xiao, Joshua M. O. Zide, Stephanie Law, Matthew F. Doty
Summary: In this study, we propose a technique for computationally studying surface polariton modes in hybrid materials. By using a semiclassical model and scattering and transfer matrix method, we solve Maxwell's equations and derive a general equation for surface polaritons in heterogeneous structures composed of N constituent materials. We apply this technique to a test structure consisting of a topological insulator and an antiferromagnetic material to investigate the resulting surface polaritons and their properties.
PHYSICAL REVIEW MATERIALS
(2022)
Article
Physics, Multidisciplinary
Sheng Liu, Andres Granados del Aguila, Dhiman Bhowmick, Chee Kwan Gan, T. Thu Ha Do, M. A. Prosnikov, David Sedmidubsky, Zdenek Sofer, Peter C. M. Christianen, Pinaki Sengupta, Qihua Xiong
Summary: In FePS3, strong coupling between magnons and phonons was directly observed using magneto-Raman spectroscopy at magnetic fields up to 30 Tesla. A hybridized magnon-phonon quasiparticle formed due to field-driven resonance with a nearby phonon mode. The polarized Raman results demonstrated the transfer of spin angular momentum from magnons to phonons, generating phonon spin through strong coupling.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Yuefei Liu, Anders Bergman, Andrey Bagrov, Anna Delin, Danny Thonig, Manuel Pereiro, Olle Eriksson, Simon Streib, Erik Sjoeqvist, Vahid Azimi-Mousolou
Summary: In this work, the existence of entangled steady-states in bipartite quantum magnonic systems at elevated temperatures is reported. The dissipative dynamics of two magnon modes in a bipartite antiferromagnet, coupled with a phonon mode and an external rotating magnetic field, are considered. The entanglement between the bipartite magnons is quantified using entanglement negativity, and its dependence on temperature and magnetic field is calculated. Evidence is provided that the coupling between the magnon and phonon modes is necessary for the entanglement, and it is shown that for specific phonon frequency and magnon-phonon coupling rate, there are always ranges of magnetic field amplitudes and frequencies where magnon-magnon entanglement persists at room temperature.
NEW JOURNAL OF PHYSICS
(2023)
Article
Chemistry, Physical
Chenglong Jia, Min Chen, Alexander F. Schaeffer, Jamal Berakdar
Summary: Antiferromagnetic materials provide a platform for ultrafast information processing with low cross-talks and compatibility with existing technology. Predicted chiral magnonic eigenmodes in AFM waveguides can be used for multiplex magnonic computing.
NPJ COMPUTATIONAL MATERIALS
(2021)
Article
Multidisciplinary Sciences
Jun Cui, Emil Vinas Bostroem, Mykhaylo Ozerov, Fangliang Wu, Qianni Jiang, Jiun-Haw Chu, Changcun Li, Fucai Liu, Xiaodong Xu, Angel Rubio, Qi Zhang
Summary: The research team observed magnon-induced chiral phonons and chirality selective magnon-phonon hybridization in the antiferromagnet FePSe3, which provides new insights for the development of angular momentum-based hybrid phononic and magnonic devices.
NATURE COMMUNICATIONS
(2023)
Article
Nanoscience & Nanotechnology
Kyusup Lee, Dong-Kyu Lee, Dongsheng Yang, Rahul Mishra, Dong-Jun Kim, Sheng Liu, Qihua Xiong, Se Kwon Kim, Kyung-Jin Lee, Hyunsoo Yang
Summary: The research demonstrates that magnon-mediated angular-momentum flow in antiferromagnets can be an efficient design element for energy-efficient, low-dissipation, and high-speed spintronic devices. It shows that antiferromagnetic magnons can propagate over micrometre distances with a superluminal-like velocity at the nanoscale. This suggests potential prospects for ultrafast nanodevices using antiferromagnetic magnons due to the generalities of finite dissipation in materials.
NATURE NANOTECHNOLOGY
(2021)
Article
Physics, Condensed Matter
Christoph P. Hofmann
Summary: In this study, higher-order corrections in the magnon dispersion relations for antiferromagnets exposed to magnetic and staggered fields aligned were derived. The interaction between magnons in the pressure was found to be attractive in both two and three spatial dimensions. The results are applicable to arbitrary bipartite geometries, although specific examples provided were for spin-2/1 square-lattice and spin-2/1 simple cubic lattice antiferromagnets.
PHYSICA B-CONDENSED MATTER
(2021)
Article
Multidisciplinary Sciences
Takuma Makihara, Kenji Hayashida, G. Timothy Noe, Xinwei Li, Nicolas Marquez Peraca, Xiaoxuan Ma, Zuanming Jin, Wei Ren, Guohong Ma, Ikufumi Katayama, Jun Takeda, Hiroyuki Nojiri, Dmitry Turchinovich, Shixun Cao, Motoaki Bamba, Junichiro Kono
Summary: Exotic quantum vacuum phenomena are predicted in cavity quantum electrodynamics systems with ultrastrong light-matter interactions, but have not been realized due to the typically negligible antiresonant interactions. This study reports an unusual matter-matter system with magnons, where the importance of resonant and antiresonant interactions can be easily tuned and the latter can be vastly dominant. The results demonstrate the potential of magnonic systems as an ideal platform for exploring predicted exotic quantum vacuum phenomena in ultrastrongly coupled light-matter systems, with up to 5.9 dB of quantum fluctuation suppression observed in the ground state.
NATURE COMMUNICATIONS
(2021)
Article
Materials Science, Multidisciplinary
Hui Pan, Zhong-Ke Ding, Bo -Wen Zeng, Nan -Nan Luo, Jiang Zeng, Li -Ming Tang, Ke-Qiu Chen
Summary: We present a new ab initio Boltzmann transport approach that considers both magnon-phonon scattering (MPS) and three-phonon scattering to accurately analyze the thermal transport properties of ferromagnetic crystals. By applying this approach to the body-centered cubic iron, we find that phonons dominate the thermal conduction at high temperatures, while magnons play a role only at low temperatures. Additionally, the abnormal increase in magnon thermal conductivity at high temperatures suggests the dominance of other magnon-involved scattering events instead of MPS. Furthermore, our analysis reveals the possibility of hydrodynamic heat transport at low temperatures.
Article
Materials Science, Multidisciplinary
Bin Wei, Jia-Ji Zhu, Yun Song, Kai Chang
Summary: We developed a self-consistent renormalized spin-wave theory for two-dimensional ferromagnetic MnBi2Te4 monolayer and studied the magnon spectrum, including magnon-magnon interactions at finite temperatures. Exchange anisotropy and single-ion anisotropy were found to be important in describing the monolayer MnBi2Te4. A significant renormalization of the magnon spectrum was discovered to be momentum dependent, especially near high-symmetry points, as the temperature approaches the Curie temperature. A notable increase in both the Curie temperature and magnetic anisotropy was observed under magnetic fields, with energy gaps increasing significantly as magnetic fields increased. Our results align well with recent experiments, providing deeper insights into the magnetic properties of two-dimensional magnets.
Article
Materials Science, Ceramics
Tamara B. Ivetic, Yang Xia, Omar Benzine, Jelena Petrovic, Jelena Papan, Svetlana R. Lukic-Petrovic, Alexander P. Litvinchuk
Summary: Electrochemical Impedance Spectroscopy (EIS) was conducted on lithium-niobium-titanium-oxide (LNTO) ceramics synthesized using a solid-state reaction method with two functional additives. Results showed that the overall electrical resistivity behavior of LNTO depends on grain boundary processes, exhibiting a negative temperature coefficient of resistance behavior and thermal activation of conduction mechanisms within a defined temperature range. Additionally, LNTO materials showed low dielectric constants of 5.5 and 12.1, indicating significant differences in properties.
CERAMICS INTERNATIONAL
(2021)
Article
Nanoscience & Nanotechnology
Elias Z. Stutz, Simon Escobar Steinvall, Alexander P. Litvinchuk, Jean-Baptiste Leran, Mahdi Zamani, Rajrupa Paul, Anna Fontcuberta i Morral, Mirjana Dimitrievska
Summary: By analyzing the vibrational properties of tetragonally-structured Zn3P2 nanowires from experimental and theoretical perspectives, a comprehensive Raman spectrum reference for Zn3P2 has been provided. The experimental results show good agreement with first-principles calculations, indicating the potential for using vibrational patterns as a detailed reference for building Raman-based methodologies.
Article
Chemistry, Multidisciplinary
Mirjana Dimitrievska, Fredrik S. Hage, Simon Escobar Steinvall, Alexander P. Litvinchuk, Elias Z. Stutz, Quentin M. Ramasse, Anna Fontcuberta Morral
Summary: This study successfully characterizes the band structure of new compounds using high resolution electron energy-loss spectroscopy on nanowires, which correlates well with first principles calculations. This opens the way for non-destructive characterization of new materials and strengthens the route to new materials discovery.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Yurii A. Romaniuk, Sergii Golovynskyi, Alexander P. Litvinchuk, Dan Dong, Yan Lin, Oleksandr Datsenko, Matteo Bosi, Luca Seravalli, Ivan S. Babichuk, Volodymyr O. Yukhymchuk, Baikui Li, Junle Qu
Summary: This study experimentally and theoretically investigated the vibration frequency changes in monolayer and few-layer MoS2 crystals, showing a good agreement between experimental and theoretical results. The proposed method can be used to estimate the layer thickness of MoS2 and determine interaction parameters, as well as to analyze spectra of other 2D layered materials.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2022)
Article
Physics, Condensed Matter
Alexander P. Litvinchuk, Volodymyr Dzhagan, Nazar Mazur, Volodymyr O. Yukhymchuk, Olga A. Kapush, Dietrich R. T. Zahn
Summary: First principles calculations were used to study the electronic band structure, optical properties, and lattice dynamics of the quaternary Cu2ZnSnTe4 (CZTTe) semiconductor with kesterite crystallographic structure. The analysis revealed that the highest frequency phonon mode in CZTTe involves heavy Sn and Te atoms due to their strong bonding. Experimental Raman spectra of Cu-Zn-Sn-Te nanocrystals showed characteristic and higher order overtones due to resonant conditions, while Raman features related to Sn-S vibrations appeared in the spectra of Cu-Zn-Sn-(Te-S) alloy nanoparticles, indicating a two-mode type of transformation in their vibrational spectra.
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Tao Chen, Chong Wang, Xinxin Xing, Zhaojun Qin, Fan Qin, Yanan Wang, Md Kamrul Alam, Viktor G. Hadjiev, Guang Yang, Shuming Ye, Jie Yang, Rongfei Wang, Shuai Yue, Di Zhang, Zhongxia Shang, Francisco C. Robles-Hernandez, Hector A. Calderon, Haiyan Wang, Zhiming Wang, Jiming Bao
Summary: The growth of highly luminescent CsPbBr3 quantum dots on CsPb2Br5 nanowires has great potential for applications in nanophotonics, optical sensing, and quantum communications. CsPbBr3-gamma X-gamma (X = Cl, I) nanocrystals on CsPb2Br5-gamma X-gamma nanowires are synthesized by immersing CsPbBr3 powder into pure water, providing tunable light sources. The transformation from CsPbBr3 powder to CsPb2Br5 microplatelets and then to nanowires is controlled by electrolytic dissociation and supersaturation of CsPb2Br5. CsPbBr3 nanocrystals are spontaneously formed on CsPb2Br5 nanowires when collected from the aqueous solution.
Article
Materials Science, Ceramics
Wenli Yang, Fernando D. Cortes Vega, Kamyar Ahmadi, Arti Rani, Viktor G. Hadjiev, Hector A. Calderon, Stanko R. Brankovic, Francisco C. Robles Hernandez
Summary: In this work, we achieved bandgap tuning of pseudoboehmite through high energy ball milling. The crystallite size of pseudoboehmite increased with milling time, while the d-spacing decreased in the c-axis direction and increased in the a-b directions. XPS and EELS analyses showed a bandgap tuning effect in pseudoboehmite after 10 hours of milling.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Physical
Xinxin Xing, Tian Tong, Mohammadjavad Mohebinia, Dezhi Wang, Zhifeng Ren, Viktor G. Hadjiev, Zhiming Wang, Jiming Bao
Summary: By correlating X-ray diffraction with photoluminescence (PL) of CsCu2I3 single-crystal wires, this study first identifies the origin of blue PL at 420 nm and excludes defect states as the source for the broadband emission at 570 nm. The pressure evolutions of PL energy, intensity, and lifetime are explained using a model of the self-trapped exciton, and polarization-dependent Raman spectra confirm the crystal structure of CsCu2I3.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Fanghao Zhang, Yifei Liu, Libo Wu, Minghui Ning, Shaowei Song, Xin Xiao, Viktor G. Hadjiev, Donglei Emma Fan, Dezhi Wang, Luo Yu, Shuo Chen, Zhifeng Ren
Summary: Seawater electrolysis for hydrogen generation is important due to limited freshwater resources. The development of non-noble-metal-based electrocatalysts with high catalytic activity, long-term durability, and high OER selectivity is crucial. In this study, a three-dimensional core-shell dendritic catalyst has been developed, showing high activity and stability in alkaline seawater.
MATERIALS TODAY PHYSICS
(2022)
Review
Physics, Condensed Matter
Volodymyr Dzhagan, Alexander P. Litvinchuk, Mykhailo Ya Valakh, Dietrich R. T. Zahn
Summary: Ternary and quaternary metal-chalcogenides, such as CuInS2 and Cu2ZnSn(S,Se)(4), have gained significant attention for their applications in alternative energy conversion and light-emitting devices. These compounds offer more sustainable and affordable solutions compared to traditional semiconductors. However, their tolerance to non-stoichiometric compositions and polymorphism can lead to undesirable coexistence of different compounds and point defects, posing challenges for practical applications. Raman spectroscopy has emerged as a powerful tool for structural diagnostics and characterization of these compounds, especially in the context of nanostructures. This review aims to summarize the current knowledge on the phonon spectra and the capabilities of Raman and IR spectroscopies in characterizing these promising families of compounds.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2023)
Article
Crystallography
Mykhailo Valakh, Alexander P. Litvinchuk, Yevhenii Havryliuk, Volodymyr Yukhymchuk, Volodymyr Dzhagan, Dmytro Solonenko, Sergei A. Kulinich, Lyudmyla Piskach, Yuriy Kogut, Lu He, Dietrich R. T. Zahn
Summary: AgGaGeS4 is a promising material with desired nonlinear properties in the infrared range. Experimental phonon and Raman spectra of AgGaGeS4 single crystals synthesized by modified Bridgman method are presented. The infrared absorption spectra are obtained from fitting reflectivity to a dielectric function model. Temperature dependence of Raman spectra is investigated between room temperature and 15 K.
Article
Materials Science, Multidisciplinary
Shenyu Dai, Xinxin Xing, Viktor G. Hadjiev, Zhaojun Qin, Tian Tong, Guang Yang, Chong Wang, Lijuan Hou, Liangzi Deng, Zhiming Wang, Guoying Feng, Jiming Bao
Summary: In this study, a theoretical model is proposed to predict the effect of hydrostatic pressure on the emission spectrum of self-trapped excitons (STE). The extremely broadband photoluminescence emission and its wide pressure spectral tuning are observed in 2D indirect bandgap CsPb(2)Br(5) crystals, and the experimental results are in good agreement with the theoretical predictions. Further analysis reveals the involvement of two types of STE and their different responses to external pressure. The investigation of published STE emissions shows a spectral blue-shift under pressure, consistent with the theoretical predictions.
MATERIALS TODAY PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Z. Y. Tian, Q. Y. Zhang, Y. W. Xiao, G. A. Gamage, F. Tian, S. Yue, V. G. Hadjiev, Jiming Bao, Zhifeng Ren, Erjun Liang, Jimin Zhao
Summary: We investigated the ultrafast quasiparticle dynamics of cubic boron arsenide and identified the interactions between electrons and phonons that contribute to its high thermal conductivity. The weak electron-phonon coupling strength and the importance of preserving this weak coupling for achieving ultrahigh thermal conductivity were demonstrated. Our findings offer insights for the search and design of materials with high thermal conductivity.
Article
Chemistry, Physical
Monika Warzecha, Lakshmanji Verma, Rajshree Chakrabarti, Viktor G. Hadjiev, Alastair J. Florence, Jeremy C. Palmer, Peter G. Vekilov
Summary: Solution crystallization is part of the material synthesis process, involving a wide range of materials from geological minerals to pharmaceuticals and electronic components. Predicting the structure, growth rates, and properties of new crystals is challenging due to a lack of understanding of the correlations between the solute oligomeric state, growth units, and crystal symmetry.
FARADAY DISCUSSIONS
(2022)
Article
Chemistry, Physical
Elias Z. Stutz, Santhanu P. Ramanandan, Mischa Flor, Rajrupa Paul, Mahdi Zamani, Simon Escobar Steinvall, Diego Armando Sandoval Salaiza, Claudia Xifra Montesinos, Maria Chiara Spadaro, Jean-Baptiste Leran, Alexander P. Litvinchuk, Jordi Arbiol, Anna Fontcuberta Morral, Mirjana Dimitrievska
Summary: This study investigates the impact of stoichiometry variations and defects on the structural and optoelectronic properties of monocrystalline zinc phosphide (Zn3P2) using experimental methods and density functional theory calculations. The results show that P interstitial defects are more favorable than Zn vacancies in P-rich and Zn-poor regions, and these defects affect the band structure and optical properties, allowing for tunable functionality in zinc phosphide.
FARADAY DISCUSSIONS
(2022)
