Journal of Physics: Condensed Matter最新文献

A remarkable match of optical response in the amorphous-crystalline and zinc blende-rock salt phase pairs of GeTe.

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2024-12-20 DOI: 10.1088/1361-648X/ad9c09

E A Plekhanov, A L Tchougréeff, A V Kolobov

{"title":"A remarkable match of optical response in the amorphous-crystalline and zinc blende-rock salt phase pairs of GeTe.","authors":"E A Plekhanov, A L Tchougréeff, A V Kolobov","doi":"10.1088/1361-648X/ad9c09","DOIUrl":"10.1088/1361-648X/ad9c09","url":null,"abstract":"Despite a large amount of theoretical and experimental work performed so far, the search of phase change materials (PCMs) is done with use of numerical modeling. However, it is not fully clear how and why the phase change translates into the optical contrast. In this work, we argue that a key prerequisite for a material to have a pronounced difference in optical properties between crystalline and glassy phases of PCM is the similar contrast between the observed crystalline and (may be experimentally inaccessible) parent crystalline polymorph of the glassy phase. To illustrate this claim, we report a comparison of dynamic dielectric function of zinc-blende (α-ZnS), CsCl, and rock-salt (NaCl) phases of the binaryAIVBVIPCM exemplified by the well known GeTe prototype compound with experimental data and supply a theoretical explanation to the observed behavior based on topological properties of the Fermi surfaces appearing in the protoptypic 'degenerate' crystals with A = B having the same local structure as the parent polymorphs and derived from simple analytical model. By this, we arrive to a qualitative rather than purely numeric guidance for possible search of the novel phase-change materials.","PeriodicalId":16776,"journal":{"name":"Journal of Physics: Condensed Matter","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142801202","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

Effect of Fe doping on the electronic properties of CoSn Kagome semimetal.

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2024-12-20 DOI: 10.1088/1361-648X/ad9a46

Kritika Vijay, Kawsar Ali, Najnin Bano, Anju Ahlawat, Mukul Gupta, Ram Janay Choudhary, D K Shukla, Ashok Arya, Soma Banik

{"title":"Effect of Fe doping on the electronic properties of CoSn Kagome semimetal.","authors":"Kritika Vijay, Kawsar Ali, Najnin Bano, Anju Ahlawat, Mukul Gupta, Ram Janay Choudhary, D K Shukla, Ashok Arya, Soma Banik","doi":"10.1088/1361-648X/ad9a46","DOIUrl":"10.1088/1361-648X/ad9a46","url":null,"abstract":"Quantum phenomena in two-dimensional Kagome materials lead to exotic topological states and complex magnetism. Here, we have investigated the detailed electronic properties of Co1-xFexSn as a function of composition (x) to explore the competing electronic interactions for the origin of complex magnetism and topological properties. We find that the screening effect in the valence electrons increases while the correlation effect decreases with an increase in the Fe doping. Valence fluctuations observed at Co and FeL2,3edges showed systematic changes in the magnitude of divalent and trivalent states with the increase inx. Fe 3dstates are found to be more screened by the conduction electrons than the Co 3dstates. A comparison of the theoretical and experimental density of states showed different natures of localized states with strong screening effects on the surface and dominating correlation effects in the bulk forx>0. We have observed localized flat bands on the CoSn (001) surface while quasi-localized flat bands on the Co0.94Fe0.06Sn (001) surface. The distinct character of the bulk and surface band structure is confirmed in the Fe-doped composition. Hence, the bulk-surface interaction present in Co1-xFexSn gives rise to the origin of valence fluctuation, complex magnetism, and topological properties.","PeriodicalId":16776,"journal":{"name":"Journal of Physics: Condensed Matter","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142770050","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

Drastic enhancement of electronic correlations induced by hydrogen insertion in the cerium intermetallic compound CeFeSi. 铈金属间化合物 CeFeSi 中氢插入引起的电子相关性急剧增强。

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2024-12-20 DOI: 10.1088/1361-648X/ad92d3

J Sourd, B Vignolle, E Gaudin, S Burdin, S Tencé

引用次数: 0

Nickelocene SPM tip as a molecular spin sensor.

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2024-12-19 DOI: 10.1088/1361-648X/ad9c08

Andrés Pinar Solé, Manish Kumar, Diego Soler-Polo, Oleksandr Stetsovych, Pavel Jelínek

引用次数: 0

Engineering skyrmion from spin spiral in transition metal multilayers.

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2024-12-19 DOI: 10.1088/1361-648X/ad9da8

Banasree Sadhukhan

{"title":"Engineering skyrmion from spin spiral in transition metal multilayers.","authors":"Banasree Sadhukhan","doi":"10.1088/1361-648X/ad9da8","DOIUrl":"10.1088/1361-648X/ad9da8","url":null,"abstract":"Skyrmions having topologically protected field configurations with particle-like properties play an important role in various fields of science. Our present study focus on the generation of skyrmion from spin spiral in the magnetic multilayers of 4d/Fe/Ir(111) with 4d = Y, Zr, Nb, Mo, Ru, Rh. Here we investigate the impact of 4d transition metals on the isotropic Heisenberg exchanges and anti-symmetric Dzyaloshinskii-Moriya interactions originating from the broken inversion symmetry at the interface of 4d/Fe/Ir(111) multilayers. We find a strong exchange frustration due to the hybridization of the Fe-3d layer with both 4d and Ir-5d layers which modifies due to band filling effects of the 4d transition metals. We strengthen the analysis of exchange frustration by shedding light on the orbital decomposition of isotropic exchange interactions of Fe-3d orbitals. Our spin dynamics and Monte Carlo simulations indicate that the magnetic ground state of 4d/Fe/Ir(111) transition multilayers is a spin spiral in theab-plane with a period of 1 to 2.5 nm generated by magnetic moments of Fe atoms and propagating along thea-direction. The spiral wavelengths in Y/Fe/Ir(111) are much larger compared to Rh/Fe/Ir(111). In order to manipulate the skyrmion phase in 4d/Fe/Ir(111), we investigate the magnetic ground state of 4d/Fe/Ir(111) transition multilayers with different external magnetic field. An increasing external magnetic field of ∼12 T is responsible for deforming the spin spiral into a isolated skyrmion which flips into skyrmion lattice phase around ∼18 T in Rh/Fe/Ir(111). Our study predict that the stability of magnetic skyrmion phase in Rh/Fe/Ir(111) against thermal fluctuations is upto temperatureT⩽90 K.","PeriodicalId":16776,"journal":{"name":"Journal of Physics: Condensed Matter","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142813399","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

Theoretical study of the temperature dependence of Auger-Meitner recombination in (Al,Ga)N quantum wells.

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2024-12-19 DOI: 10.1088/1361-648X/ad98d9

Joshua M McMahon, Robert Finn, Stefan Schulz

{"title":"Theoretical study of the temperature dependence of Auger-Meitner recombination in (Al,Ga)N quantum wells.","authors":"Joshua M McMahon, Robert Finn, Stefan Schulz","doi":"10.1088/1361-648X/ad98d9","DOIUrl":"10.1088/1361-648X/ad98d9","url":null,"abstract":"Non-radiative Auger-Meitner recombination processes in III-nitride based optoelectronic devices operating in thevisiblespectral range have received significant attention in recent years as they can present a major contribution to the efficiency drop at high temperatures and carrier densities. However, insight into these recombination processes is sparse for III-N devices operating in theultravioletwavelength window. In this work we target the temperature dependence of the Auger-Meitner recombination rate in (Al,Ga)N/AlN quantum wells by means of an atomistic electronic structure model that accounts for random alloy fluctuations and connected carrier localisation effects. Our calculations show that in the low temperature regime both the non-radiative Auger-Meitner and radiative recombination rate are strongly impacted by alloy disorder induced carrier localisation effects in these systems. The influence of alloy disorder on the recombination rates is reduced in the high temperature regime, especially for the radiative rate. The Auger-Meitner recombination rate, however, may still be more strongly impacted by alloy disorder when compared to the radiative rate. Our calculations show that while on average radiative recombination slightly increases with increasing temperature, the Auger-Meitner recombination process may, on average, slightly decrease in the temperature range relevant to the thermal efficiency drop (thermal droop). This finding suggests that the considered Auger-Meitner recombination process is unlikely to be directly responsible for the thermal efficiency drop observed experimentally in (Al,Ga)N/AlN quantum well based light emitting devices. Thus, different non-radiative processes, external to the active region, may be the underlying cause of thermal droop in (Al,Ga)N wells.","PeriodicalId":16776,"journal":{"name":"Journal of Physics: Condensed Matter","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142755249","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

Manipulating ambient pressure superconductivity in metal borocarbides through hole doping.

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2024-12-18 DOI: 10.1088/1361-648X/ada105

Qing Tian, Wei Zhang, Weiyi Xia, Hanyu Liu, Cai-Zhuang Wang

引用次数: 0

Large Scale Raman Spectrum Calculations in Defective 2D Materials using Deep Learning.

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2024-12-18 DOI: 10.1088/1361-648X/ada106

Olivier Malenfant-Thuot, Dounia Shaaban Kabakibo, Simon Blackburn, Bruno Rousseau, Michel Cote

引用次数: 0

Perturbative ensemble density functional theory applied to charge transfer excitations.

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2024-12-17 DOI: 10.1088/1361-648X/ada07e

Gil S Amoyal, Leeor Kronik, Tim Gould

引用次数: 0

Effects of nonmagnetic Cr substitution for Mn on kagome magnet DyMn6Sn6.

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2024-12-17 DOI: 10.1088/1361-648X/ada09d

Xiangqi Liu, Zicheng Tao, Wei Xia, Yanfeng Guo

{"title":"Effects of nonmagnetic Cr substitution for Mn on kagome magnet DyMn6Sn6.","authors":"Xiangqi Liu, Zicheng Tao, Wei Xia, Yanfeng Guo","doi":"10.1088/1361-648X/ada09d","DOIUrl":"https://doi.org/10.1088/1361-648X/ada09d","url":null,"abstract":"RMn6Sn6 (R = rare-earth) kagome magnets have been one of the research focuses in condensed matter physics, primarily due to their exotic physical properties rooted in the interplay between magnetism and nontrivial topological band structures. We reported herein the crystal growth of Cr substituted DyMn4Cr2Sn6 and investigations on their magnetotransport properties. It is unveiled that the Mn kagome layer is destroyed and the in-plane ferromagnetic exchange is consequently weakened by the substituted nonmagnetic Cr. Furthermore, the substitution apparently benefits reorientations of the Mn spins under external magnetic field. Besides, the Cr substitution results in a significantly enhanced large intrinsic anomalous Hall conductivity, reaching 600 S cm-1 at 240 K. The anomaly observed in the anomalous Hall conductivity as well as in the Hall coefficient might indicate a topological magnetic structure formed during the spin reorientation process. These findings pave the way for manipulating magnetism and electronic structures in magnetic kagome topological phases and offer a fertile ground for discovering exotic topological properties.","PeriodicalId":16776,"journal":{"name":"Journal of Physics: Condensed Matter","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142846476","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