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Terahertz conductivity of two-dimensional materials: a review. 二维材料的太赫兹电导率：综述。
IF 2.3 4区 物理与天体物理
Journal of Physics: Condensed Matter Pub Date : 2025-02-13 DOI: 10.1088/1361-648X/adab6a
Shuva Mitra, Laleh Avazpour, Irena Knezevic
{"title":"Terahertz conductivity of two-dimensional materials: a review.","authors":"Shuva Mitra, Laleh Avazpour, Irena Knezevic","doi":"10.1088/1361-648X/adab6a","DOIUrl":"10.1088/1361-648X/adab6a","url":null,"abstract":"<p><p>Two-dimensional (2D) van der Waals materials are shaping the landscape of next-generation devices, offering significant technological value thanks to their unique, tunable, and layer-dependent electronic and optoelectronic properties. Time-domain spectroscopic techniques at terahertz (THz) frequencies offer noninvasive, contact-free methods for characterizing the dynamics of carriers in 2D materials. They also pave the path toward the applications of 2D materials in detection, imaging, manufacturing, and communication within the increasingly important THz frequency range. In this paper, we overview the synthesis of 2D materials and the prominent THz spectroscopy techniques: THz time-domain spectroscopy, optical-pump THz-probe technique, and optical pump-probe THz spectroscopy. Through a confluence of experimental findings, numerical simulation, and theoretical analysis, we present the current understanding of the rich ultrafast physics of technologically significant 2D materials: graphene, transition metal dichalcogenides, MXenes, perovskites, topological 2D materials, and 2D heterostructures. Finally, we offer a perspective on the role of THz characterization in guiding future research and in the quest for ideal 2D materials for new applications.</p>","PeriodicalId":16776,"journal":{"name":"Journal of Physics: Condensed Matter","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143007160","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Manipulation and trapping of magnetic skyrmions with domain walls in chiral magnetic thin films.
IF 2.3 4区 物理与天体物理
Journal of Physics: Condensed Matter Pub Date : 2025-02-13 DOI: 10.1088/1361-648X/adb230
P Leask
{"title":"Manipulation and trapping of magnetic skyrmions with domain walls in chiral magnetic thin films.","authors":"P Leask","doi":"10.1088/1361-648X/adb230","DOIUrl":"10.1088/1361-648X/adb230","url":null,"abstract":"<p><p>In this article we use chiral domain walls to manipulate and trap magnetic skyrmion quasi-particles in chiral magnetic materials such as ultrathin Co/Pt films. The magnetic skyrmions can be orientated such that their interaction with domain walls is repulsive, allowing for them to be stored between domain walls. In certain orientations, the skyrmion can be absorbed into the domain wall, forming a domain wall kink. In other orientations, it can absorbed to form a kink-antikink domain wall with zero topological charge. The magnetic skyrmion can even be orientated in such a way that it remains trapped but creates a topological defect-antidefect pair in one of the walls. By altering the phases of one of the chiral domain walls, one can erase or store the magnetic skyrmion as an isolated soliton or as a domain wall skyrmion/antiskyrmion. This adds a valuable asset to an ever growing toolbox of spintronic nano-devices.</p>","PeriodicalId":16776,"journal":{"name":"Journal of Physics: Condensed Matter","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143189746","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The surface termination of a Fe (III) spin crossover molecular salt.
IF 2.3 4区 物理与天体物理
Journal of Physics: Condensed Matter Pub Date : 2025-02-12 DOI: 10.1088/1361-648X/adaff9
M Zaid Zaz, Binny Tamang, Kayleigh McElveen, Esha Mishra, Gauthami Viswan, Wai Kiat Chin, Arjun Subedi, Alpha T N'Daiye, Rebecca Y Lai, Peter A Dowben
{"title":"The surface termination of a Fe (III) spin crossover molecular salt.","authors":"M Zaid Zaz, Binny Tamang, Kayleigh McElveen, Esha Mishra, Gauthami Viswan, Wai Kiat Chin, Arjun Subedi, Alpha T N'Daiye, Rebecca Y Lai, Peter A Dowben","doi":"10.1088/1361-648X/adaff9","DOIUrl":"10.1088/1361-648X/adaff9","url":null,"abstract":"<p><p>From a comparison of the known molecular stoichiometry and x-ray photoemission spectroscopy, it is evident that the Fe(III) spin crossover salt [Fe(qsal)<sub>2</sub>Ni(dmit)<sub>2</sub>] has a preferential surface termination with the Ni(dmit)<sub>2</sub>moiety, where qsal = N(8quinolyl)salicylaldimine, and dmit<sup>2-</sup>= 1,3-dithiol-2-thione-4,5-dithiolato. This preferential surface termination leads to a significant surface to bulk core level shift for the Ni 2p x-ray photoemission core level, not seen in the corresponding Fe 2p core level spectra. A similar surface to bulk core level shift is seen in Pd 3d in the related [Fe(qsal)<sub>2</sub>]<sub>2</sub>Pd(dmit)<sub>2</sub>. Inverse photoemission spectroscopy, compared with the x-ray absorption spectra at the Ni-L3,2 edge provides some indication of the density of states resulting from the dmit<sup>2-</sup>= 1,3-dithiol-2-thione-4,5-dithiolato ligand unoccupied molecular orbitals and thus supports the evidence regarding surface termination in the Ni(dmit)<sub>2</sub>moiety.</p>","PeriodicalId":16776,"journal":{"name":"Journal of Physics: Condensed Matter","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143066331","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Novel low-energy geometries of single, double and triple tellurium atomic helices.
IF 2.3 4区 物理与天体物理
Journal of Physics: Condensed Matter Pub Date : 2025-02-12 DOI: 10.1088/1361-648X/adb11a
George Kirczenow
{"title":"Novel low-energy geometries of single, double and triple tellurium atomic helices.","authors":"George Kirczenow","doi":"10.1088/1361-648X/adb11a","DOIUrl":"10.1088/1361-648X/adb11a","url":null,"abstract":"<p><p>A theoretical study of single, double and triple hydrogen-terminated chains of tellurium atoms is presented. Surprisingly, H-terminated single chains with 3 Te atoms per unit cell (as in bulk trigonal Te) are found to be unstable. They relax to regular helical structures with lower energies and smaller twist angles. However, some irregular chains are found to have still lower energies, and compact disordered H-terminated Te chains of mixed chirality are found to have even lower energies. These findings are compared with results of a new systematic study of infinite periodic Te atomic chains. Pairs of H-terminated Te atomic chains are found to form DNA-like double helices with lower energies than compact disordered structures of the two chains. Triplets of H-terminated Te atomic chains are found to form triple helices. The single, double and triple Te helices reported here are beyond the scope of previously studied periodic models with small unit cells.</p>","PeriodicalId":16776,"journal":{"name":"Journal of Physics: Condensed Matter","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143074552","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Structural diversity and electronic properties of neodymium borides under high pressure.
IF 2.3 4区 物理与天体物理
Journal of Physics: Condensed Matter Pub Date : 2025-02-11 DOI: 10.1088/1361-648X/adb11c
Weiguo Sun, Xiaofeng Li, Chuanzhao Zhang, Meng Ju
{"title":"Structural diversity and electronic properties of neodymium borides under high pressure.","authors":"Weiguo Sun, Xiaofeng Li, Chuanzhao Zhang, Meng Ju","doi":"10.1088/1361-648X/adb11c","DOIUrl":"10.1088/1361-648X/adb11c","url":null,"abstract":"<p><p>Rare earth (RE) borides have garnered significant attention due to their high mechanical strength, superconductivity, and novel electronic properties. In this study, we systematically investigate the structural, electronic, and mechanical properties of RE neodymium borides across a wide range of pressures. Various stoichiometries of Nd-B compounds are predicted using the unbiased CALYPSO structure search method and density functional theory calculations. Our findings indicate that the newly predicted NdB<sub>5</sub>, NdB<sub>7</sub>, and NdB<sub>8</sub>compounds are thermodynamically and mechanically stable at high pressures. Detailed analyses of the electronic band structure and density of states reveal that all neodymium borides exhibit metallic behaviour. The hardness of the stable phases has been evaluated using an empirical model. Notably, NdB<sub>5</sub>compound could also be dynamically and mechanically stable at ambient pressure with an estimated hardness of approximately 24.82 GPa, suggesting that NdB<sub>5</sub>is a potential hard metal boride. Our results provide valuable insights into the structural, electronic, and mechanical properties of Nd-B compounds, enhancing our understanding of their potential applications in various fields.</p>","PeriodicalId":16776,"journal":{"name":"Journal of Physics: Condensed Matter","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143074570","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Catalytic reduction of carbon dioxide to methanol over defect-laden hexagonal boron nitride: insights into reaction mechanisms.
IF 2.3 4区 物理与天体物理
Journal of Physics: Condensed Matter Pub Date : 2025-02-11 DOI: 10.1088/1361-648X/adad2b
Tao Jiang, Duy Le, Katerina L Chagoya, David J Nash, Richard G Blair, Talat S Rahman
{"title":"Catalytic reduction of carbon dioxide to methanol over defect-laden hexagonal boron nitride: insights into reaction mechanisms.","authors":"Tao Jiang, Duy Le, Katerina L Chagoya, David J Nash, Richard G Blair, Talat S Rahman","doi":"10.1088/1361-648X/adad2b","DOIUrl":"https://doi.org/10.1088/1361-648X/adad2b","url":null,"abstract":"<p><p>We present a density functional theory-based mechanistic understanding of CO<sub>2</sub>hydrogenation to value-added products on a nitrogen-vacancy (V<sub>N</sub>) defect in hexagonal boron nitride (<i>dh</i>-BN). Activation occurs through back-donation to the<i>π</i>* orbitals of CO<sub>2</sub>from the frontier orbitals (defect state) of the<i>h-</i>BN sheet that are localized near a nitrogen-vacancy. Subsequent hydrogenation to methanol (CH<sub>3</sub>OH) and formic acid (HCOOH) proceed through vacancy-facilitated co-adsorption of hydrogen and CO<sub>2</sub>. More importantly, our reaction pathway analyses complimented by microkinetic modeling indicate that<i>dh</i>-BN is potentially a low-temperature, selective catalyst for CO<sub>2</sub>reduction to methanol. Our findings are in agreement with experiments conducted in a mechanical reactor that show high selectivity towards methanol formation for CO<sub>2</sub>hydrogenation on defect induced<i>h-</i>BN.</p>","PeriodicalId":16776,"journal":{"name":"Journal of Physics: Condensed Matter","volume":"37 13","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143391209","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Time-dependent propulsion of fully inertial active stochastic particles: theory and simulations.
IF 2.3 4区 物理与天体物理
Journal of Physics: Condensed Matter Pub Date : 2025-02-11 DOI: 10.1088/1361-648X/adb089
Luis L Gutierrez-Martinez, Mario Sandoval
{"title":"Time-dependent propulsion of fully inertial active stochastic particles: theory and simulations.","authors":"Luis L Gutierrez-Martinez, Mario Sandoval","doi":"10.1088/1361-648X/adb089","DOIUrl":"10.1088/1361-648X/adb089","url":null,"abstract":"<p><p>Up to now, studies on fully inertial (adding mass and moment of inertia) active Brownian particles (IABPs) have only considered a constant propulsion force. This work overcomes this by studying IABPs but with a time-dependent propulsion and analytically characterizes this system by finding its mean-square displacement and effective diffusion for any periodic time-dependent propulsion speed. To exemplify the periodic general expressions, three particular self-propulsion signals are addressed, expressly, a cosine, a square-wave, and a zig-zag propulsion force. Langevin dynamics simulations are also employed to validate the analytical findings.</p>","PeriodicalId":16776,"journal":{"name":"Journal of Physics: Condensed Matter","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143066332","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Role of spin-orbit coupling for the band splitting inα-Sb andα-Bi on SiC(0001). 自旋-轨道耦合在SiC上的能带分裂中的作用（0001）。
IF 2.3 4区 物理与天体物理
Journal of Physics: Condensed Matter Pub Date : 2025-02-10 DOI: 10.1088/1361-648X/ada981
Ken Yaegashi, Katsuaki Sugawara, Takashi Takahashi, Takafumi Sato
{"title":"Role of spin-orbit coupling for the band splitting in<i>α</i>-Sb and<i>α</i>-Bi on SiC(0001).","authors":"Ken Yaegashi, Katsuaki Sugawara, Takashi Takahashi, Takafumi Sato","doi":"10.1088/1361-648X/ada981","DOIUrl":"10.1088/1361-648X/ada981","url":null,"abstract":"<p><p>Monolayer atomic thin films of group-V elements have a high potential for application in spintronics and valleytronics because of their unique crystal structure and strong spin-orbit coupling. We fabricated Sb and Bi monolayers on a SiC(0001) substrate by the molecular-beam-epitaxy method and studied the electronic structure by angle-resolved photoemission spectroscopy (ARPES) and first-principles calculations. The fabricated Sb film shows the (√3 × √3)<i>R</i>30° superstructure associated with the formation of<i>α</i>-Sb, and exhibits a semiconducting nature with a band gap of more than 1.8 eV. Spin-resolved ARPES measurements of isostructural<i>α</i>-Bi revealed the in-plane spin polarization for the topmost valence band, demonstrating its Rashba-splitting nature due to the space-inversion-symmetry breaking. We discuss the origin of observed characteristic band structure and its similarity and difference between Sb and Bi.</p>","PeriodicalId":16776,"journal":{"name":"Journal of Physics: Condensed Matter","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143007228","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Quantum transport under oscillatory drive with disordered amplitude. 无序振幅振荡驱动下的量子输运。
IF 2.3 4区 物理与天体物理
Journal of Physics: Condensed Matter Pub Date : 2025-02-07 DOI: 10.1088/1361-648X/adaba9
Vatsana Tiwari, Sushanta Dattagupta, Devendra Singh Bhakuni, Auditya Sharma
{"title":"Quantum transport under oscillatory drive with disordered amplitude.","authors":"Vatsana Tiwari, Sushanta Dattagupta, Devendra Singh Bhakuni, Auditya Sharma","doi":"10.1088/1361-648X/adaba9","DOIUrl":"10.1088/1361-648X/adaba9","url":null,"abstract":"<p><p>We investigate the dynamics of non-interacting particles in a one-dimensional tight-binding chain in the presence of an electric field with random amplitude drawn from a Gaussian distribution, and explicitly focus on the nature of quantum transport. We derive an exact expression for the probability propagator and the mean-squared displacement in the clean limit and generalize it for the disordered case using the Liouville operator method. Our analysis reveals that in the presence a random static field, the system follows diffusive transport; however, an increase in the field strength causes a suppression in the transport and thus asymptotically leads towards localization. We further extend the analysis for a time-dependent disordered electric field and show that the dynamics of mean-squared-displacement deviates from the parabolic path as the field strength increases, unlike the clean limit where ballistic transport occurs.</p>","PeriodicalId":16776,"journal":{"name":"Journal of Physics: Condensed Matter","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143007224","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Micromagnetic simulations of magnon-magnon coupling in synthetic antiferromagnets with tilted magnetic anisotropy.
IF 2.3 4区 物理与天体物理
Journal of Physics: Condensed Matter Pub Date : 2025-02-06 DOI: 10.1088/1361-648X/adaf68
Xing Chen, Cuixiu Zheng, Haoxiang Xu, Yaowen Liu
{"title":"Micromagnetic simulations of magnon-magnon coupling in synthetic antiferromagnets with tilted magnetic anisotropy.","authors":"Xing Chen, Cuixiu Zheng, Haoxiang Xu, Yaowen Liu","doi":"10.1088/1361-648X/adaf68","DOIUrl":"10.1088/1361-648X/adaf68","url":null,"abstract":"<p><p>Hybrid magnonics has attracted extensive attention for its potential applications in quantum information processing, especially following the discovery of strong coupling in magnon-magnon hybrid systems. In this paper, we studied the coupling phenomena between the left-handed (LH) and right-handed (RH) magnon modes in synthetic antiferromagnets with a tilted perpendicular magnetic anisotropy (PMA). By tilting the PMA at a certain angle from the film normal, we achieved strong magnon-magnon coupling without the need for an external magnetic field. The resulting hybrid eigenmodes exhibit characteristics of a linear combination of pure LH and RH modes. In addition, micromagnetic simulations revealed in detail the gradual change of hybrid resonance modes from approximately linear to elliptic, and eventually to circular polarization as the coupling strength gradually decreases. We also examined the effects of an applied magnetic field on the coupling strength and mechanism between the two eigenmodes. These findings provide valuable insights into magnetic dynamics within hybrid magnonic systems for spintronic applications involving magnon polarization.</p>","PeriodicalId":16776,"journal":{"name":"Journal of Physics: Condensed Matter","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143059460","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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