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Optical Properties of Magnetic Monopole Excitons 磁单极子激子的光学性质
IF 1.7
Condensed Matter Pub Date : 2023-05-09 DOI: 10.3390/condmat8020043
Junhui Cao, A. Kavokin
{"title":"Optical Properties of Magnetic Monopole Excitons","authors":"Junhui Cao, A. Kavokin","doi":"10.3390/condmat8020043","DOIUrl":"https://doi.org/10.3390/condmat8020043","url":null,"abstract":"Here we consider theoretically an exciton-like dipole formed by a magnetic monopole and a magnetic antimonopole. This type of quasiparticles may be formed in a magnetic counterpart of a one dimensional semiconductor crystal. We use the familiar Lorentz driven damped harmonic oscillator model to find the eigenmodes of magnetic monopole dipoles strongly coupled to light. The proposed model allows predicting optical signatures of magnetic monopole excitons in crystals.","PeriodicalId":10665,"journal":{"name":"Condensed Matter","volume":" ","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47740391","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Charge-Density Waves vs. Superconductivity: Some Results and Future Perspectives 电荷密度波与超导性：一些结果和未来展望
IF 1.7
Condensed Matter Pub Date : 2023-05-05 DOI: 10.3390/condmat8030054
G. Venditti, S. Caprara
{"title":"Charge-Density Waves vs. Superconductivity: Some Results and Future Perspectives","authors":"G. Venditti, S. Caprara","doi":"10.3390/condmat8030054","DOIUrl":"https://doi.org/10.3390/condmat8030054","url":null,"abstract":"Increasing experimental evidence suggests the occurrence of filamentary superconductivity in different (quasi) two-dimensional physical systems. In this piece of work, we discuss the proposal that under certain circumstances, this occurrence may be related to the competition with a phase characterized by charge ordering in the form of charge-density waves. We provide a brief summary of experimental evidence supporting our argument in two paradigmatic classes of materials, namely transition metal dichalcogenides and cuprates superconductors. We present a simple Ginzburg–Landau two-order-parameters model as a starting point to address the study of such competition. We finally discuss the outcomes of a more sophisticated model, already presented in the literature and encoding the presence of impurities, and how it can be further improved in order to really address the interplay between charge-density waves and superconductivity and the possible occurrence of filamentary superconductivity at the domain walls between different charge-ordered regions.","PeriodicalId":10665,"journal":{"name":"Condensed Matter","volume":" ","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45369133","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Low-Lying Collective Excitations of Superconductors and Charged Superfluids 超导体和带电超流体的低洼集体激励
IF 1.7
Condensed Matter Pub Date : 2023-05-03 DOI: 10.3390/condmat8020042
S. Klimin, J. Tempère, H. Kurkjian
{"title":"Low-Lying Collective Excitations of Superconductors and Charged Superfluids","authors":"S. Klimin, J. Tempère, H. Kurkjian","doi":"10.3390/condmat8020042","DOIUrl":"https://doi.org/10.3390/condmat8020042","url":null,"abstract":"We investigate theoretically the momentum-dependent frequency and damping of low-lying collective excitations of superconductors and charged superfluids in the BCS–BEC crossover regime. The study is based on the Gaussian pair-and-density fluctuation method for the propagator of Gaussian fluctuations of the pair and density fields. Eigenfrequencies and damping rates are determined in a mutually consistent nonperturbative way as complex poles of the fluctuation propagator. Particular attention is paid to new features with respect to preceding theoretical studies, which were devoted to collective excitations of superconductors in the far BCS regime. We find that at a sufficiently strong coupling, new branches of collective excitations appear, which manifest different behavior as functions of the momentum and the temperature.","PeriodicalId":10665,"journal":{"name":"Condensed Matter","volume":" ","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46455245","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Features of Light-Matter Coupling in Non-Ideal Lattice of Coupled Microcavities Containing Quantum Dots 包含量子点的耦合微腔的非理想晶格中的光物质耦合特性
IF 1.7
Condensed Matter Pub Date : 2023-05-02 DOI: 10.3390/condmat8020041
V. Rumyantsev, S. Fedorov, K. Gumennyk, A. Y. Rybalka
{"title":"Features of Light-Matter Coupling in Non-Ideal Lattice of Coupled Microcavities Containing Quantum Dots","authors":"V. Rumyantsev, S. Fedorov, K. Gumennyk, A. Y. Rybalka","doi":"10.3390/condmat8020041","DOIUrl":"https://doi.org/10.3390/condmat8020041","url":null,"abstract":"In this paper, within the framework of virtual crystal approximation, the mathematical modeling of the dependence of the density of states of polariton excitations in a 1D photonic crystal—a system of pores (tunnel-coupled microresonators) containing quantum dots—on the concentration of structural defects is performed.","PeriodicalId":10665,"journal":{"name":"Condensed Matter","volume":" ","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42382164","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Investigating the Intrinsic Anisotropy of VO2(101) Thin Films Using Linearly Polarized Resonant Photoemission Spectroscopy 用线性偏振共振发光光谱研究VO2（101）薄膜的本征各向异性
IF 1.7
Condensed Matter Pub Date : 2023-04-26 DOI: 10.3390/condmat8020040
A. D’Elia, V. Polewczyk, A. Petrov, Liangbin Li, C. Zou, J. Rezvani, A. Marcelli
{"title":"Investigating the Intrinsic Anisotropy of VO2(101) Thin Films Using Linearly Polarized Resonant Photoemission Spectroscopy","authors":"A. D’Elia, V. Polewczyk, A. Petrov, Liangbin Li, C. Zou, J. Rezvani, A. Marcelli","doi":"10.3390/condmat8020040","DOIUrl":"https://doi.org/10.3390/condmat8020040","url":null,"abstract":"VO2 is one of the most studied vanadium oxides because it undergoes a reversible metal-insulator transition (MIT) upon heating with a critical temperature of around 340 K. One of the most overlooked aspects of VO2 is the band’s anisotropy in the metallic phase when the Fermi level is crossed by two bands: π* and d||. They are oriented perpendicularly in one respect to the other, hence generating anisotropy. One of the parameters tuning MIT properties is the unbalance of the electron population of π* and d|| bands that arise from their different energy position with respect to the Fermi level. In systems with reduced dimensionality, the electron population disproportion is different with respect to the bulk leading to a different anisotropy. Investigating such a system with a band-selective spectroscopic tool is mandatory. In this manuscript, we show the results of the investigation of a single crystalline 8 nm VO2/TiO2(101) film. We report on the effectiveness of linearly polarized resonant photoemission (ResPES) as a band-selective technique probing the intrinsic anisotropy of VO2.","PeriodicalId":10665,"journal":{"name":"Condensed Matter","volume":" ","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44361905","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Anodic Potential and Conversion Chemistry of Anhydrous Iron (II) Oxalate in Na-Ion Batteries 钠离子电池中无水草酸铁（II）的阳极电位和转化化学
IF 1.7
Condensed Matter Pub Date : 2023-04-23 DOI: 10.3390/condmat8020038
Vasilii Gromov, Atlas Noubir, F. Keshavarz, Ekaterina Laakso, B. Barbiellini, A. Bansil
{"title":"Anodic Potential and Conversion Chemistry of Anhydrous Iron (II) Oxalate in Na-Ion Batteries","authors":"Vasilii Gromov, Atlas Noubir, F. Keshavarz, Ekaterina Laakso, B. Barbiellini, A. Bansil","doi":"10.3390/condmat8020038","DOIUrl":"https://doi.org/10.3390/condmat8020038","url":null,"abstract":"Anhydrous ferrous (II) oxalate (AFO) outperforms its hydrated form when used as an anode material in Li-ion batteries (LIBs). With the increasing interest in Na-ion batteries (NIBs) in mind, we examine the potential of AFO as the anode in NIBs through first principles calculations involving both periodic and non-periodic structures. Our analysis based on periodic (non-periodic) modeling scheme shows that the AFO anode generates a low reaction potential of 1.22 V (1.45 V) in the NIBs, and 1.34 V (1.24 V) in the LIBs, which is much lower than the potential of NIBs with mixed oxalates. The conversion mechanism in the underlying electrochemical process involves the reduction of Fe2+ with the addition of Na or Li. Such conversion electrodes can achieve high capacities through the Fe2+ valence states of iron.","PeriodicalId":10665,"journal":{"name":"Condensed Matter","volume":" ","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46605245","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Superconducting Stiffness and Coherence Length of FeSe0.5Te0.5 Measured in a Zero-Applied Field 零外加场中FeSe0.5Te0.5超导刚度和相干长度的测量
IF 1.7
Condensed Matter Pub Date : 2023-04-23 DOI: 10.3390/condmat8020039
Amotz Peri, I. Mangel, A. Keren
{"title":"Superconducting Stiffness and Coherence Length of FeSe0.5Te0.5 Measured in a Zero-Applied Field","authors":"Amotz Peri, I. Mangel, A. Keren","doi":"10.3390/condmat8020039","DOIUrl":"https://doi.org/10.3390/condmat8020039","url":null,"abstract":"Superconducting stiffness ρs and coherence length ξ are usually determined by measuring the penetration depth λ of a magnetic field and the upper critical field Hc2 of a superconductor (SC), respectively. However, in magnetic SC, which is iron-based, this could lead to erroneous results, since the internal field could be very different from the applied one. To overcome this problem in Fe1+ySexTe1−x with x∼0.5 and y∼0 (FST), we measured both quantities with the Stiffnessometer technique. In this technique, one applies a rotor-free vector potential A to a superconducting ring and measures the current density j via the ring’s magnetic moment m. ρs and ξ are determined from London’s equation, j=−ρsA, and its range of validity. This method is particularly accurate at temperatures close to the critical temperature Tc. We find weaker ρs and longer ξ than existing literature reports, and critical exponents which agree better with expectations based on the Ginzburg–Landau theory.","PeriodicalId":10665,"journal":{"name":"Condensed Matter","volume":" ","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43204956","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Advanced Boron Carbide Matrix Nanocomposites Obtained from Liquid-Charge: Focused Review 液体电荷法制备的新型碳化硼基纳米复合材料研究进展
IF 1.7
Condensed Matter Pub Date : 2023-04-20 DOI: 10.3390/condmat8020037
L. Chkhartishvili, A. Mikeladze, O. Tsagareishvili, V. Kvatchadze, V. Tavkhelidze, Z. Mestvirishvili, Dimitri Driaev, N. Barbakadze, L. Nadaraia, K. Sarajishvili, Irma Jinikashvili, Manana Buzariashvili, R. Chedia
{"title":"Advanced Boron Carbide Matrix Nanocomposites Obtained from Liquid-Charge: Focused Review","authors":"L. Chkhartishvili, A. Mikeladze, O. Tsagareishvili, V. Kvatchadze, V. Tavkhelidze, Z. Mestvirishvili, Dimitri Driaev, N. Barbakadze, L. Nadaraia, K. Sarajishvili, Irma Jinikashvili, Manana Buzariashvili, R. Chedia","doi":"10.3390/condmat8020037","DOIUrl":"https://doi.org/10.3390/condmat8020037","url":null,"abstract":"Boron carbide is known as a hard material; it possesses a unique complex of physical-mechanical properties and has diverse applications in industries. An expansion of its field of uses stems from the creation of boron carbide matrix nanocomposite materials. In view of this perspective, an effective liquid-charge synthesizing method for their components in nanopowder form has been proposed. This paper provides a focused review on advanced boron carbide matrix ceramic and metal-ceramic nanocomposites recently obtained by the authors using this method. Particular attention is paid to the characterization of boron carbide nanocomposites, including some ceramic borides, metallic alloys and also other metal-ceramic composites.","PeriodicalId":10665,"journal":{"name":"Condensed Matter","volume":" ","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43096331","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Quadriexciton Binding Energy in Electron–Hole Bilayers 电子-空穴双层中的四极子结合能
IF 1.7
Condensed Matter Pub Date : 2023-04-18 DOI: 10.3390/condmat8020044
Cesare Malosso, G. Senatore, S. De Palo
{"title":"Quadriexciton Binding Energy in Electron–Hole Bilayers","authors":"Cesare Malosso, G. Senatore, S. De Palo","doi":"10.3390/condmat8020044","DOIUrl":"https://doi.org/10.3390/condmat8020044","url":null,"abstract":"Excitonic condensation and superfluidity have recently received a renewed attention, due to the fabrication of bilayer systems in which electrons and holes are spatially separated and form stable pairs known as indirect excitons. Dichalcogenides- and graphene-based bilayers are nowadays built and investigated, giving access to systems with (i) only spin degeneracy and (ii) spin and valley degeneracy. Simulation studies performed in the last decades at T=0 for simple, model electron–hole bilayers, as function of the interlayer distance and in-layer carrier density, have revealed in case (i) the formation of biexcitons in a tiny region of the parameter space and in case (ii) the formation of stable compounds made of four electrons and four holes (quadriexcitons) in a sizable region of the parameter space. Of some interest is the relation of the properties of isolated biexcitons (quadriexcitons) and those of their finite-density counterpart. In fact, the isolated biexciton has been repeatedly studied in the last years with simulations and other techniques. No simulations, instead, are available to our knowledge for the isolated quadriexciton, for which we present here results of the first quantum Monte Carlo (QMC) study. Stability with respect to the dissociation into biexcitons and the pair correlations while varying the interlayer distance d are discussed.","PeriodicalId":10665,"journal":{"name":"Condensed Matter","volume":" ","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48856969","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Effects of Focused Ion Beam Lithography on La2−xSrxCuO4 Single Crystals 聚焦离子束光刻对La2−xSrxCuO4单晶的影响
IF 1.7
Condensed Matter Pub Date : 2023-04-13 DOI: 10.3390/condmat8020035
R. Caruso, F. Camino, G. Gu, J. Tranquada, Myung‐Geun Han, Yimei Zhu, A. Bollinger, I. Božović
{"title":"Effects of Focused Ion Beam Lithography on La2−xSrxCuO4 Single Crystals","authors":"R. Caruso, F. Camino, G. Gu, J. Tranquada, Myung‐Geun Han, Yimei Zhu, A. Bollinger, I. Božović","doi":"10.3390/condmat8020035","DOIUrl":"https://doi.org/10.3390/condmat8020035","url":null,"abstract":"Focused ion beam (FIB) milling is a mask-free lithography technique that allows the precise shaping of 3D materials on the micron and sub-micron scale. The recent discovery of electronic nematicity in La2−xSrxCuO4 (LSCO) thin films triggered the search for the same phenomenon in bulk LSCO crystals. With this motivation, we have systematically explored FIB patterning of bulk LSCO crystals into micro-devices suitable for longitudinal and transverse resistivity measurements. We found that several detrimental factors can affect the result, ultimately compromising the possibility of effectively using FIB milling to fabricate sub-micrometer LSCO devices, especially in the underdoped regime.","PeriodicalId":10665,"journal":{"name":"Condensed Matter","volume":" ","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48109989","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
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