David T. S. Perkins, Anirudh Chandrasekaran, Joseph J. Betouras
The interplay of high-order Van Hove singularities and topology plays a central role in determining the nature of the electronic correlations governing the phase of a system with unique signatures characterizing their presence. Layered van der Waals heterostuctures are ideal systems for band engineering through the use of twisting and proximity effects. Here, we use symmetry to demonstrate how twisted kagome bilayers can host topological high-order Van Hove singularities. We study a commensurate system with a large twist angle and demonstrate how the initial choice of high-symmetry stacking order can greatly influence the electronic structure and topology of the system. Furthermore, we study the possibility of sublattice interference in the system. Our results illustrate the rich energy landscape of twisted kagome bilayers and unveil large Chern numbers (of order 10), establishing twisted bilayer kagome as a natural playground for probing the mixing of strong correlations and topology.
{"title":"Designing topological high-order Van Hove singularities: Twisted bilayer kagome","authors":"David T. S. Perkins, Anirudh Chandrasekaran, Joseph J. Betouras","doi":"10.1103/8y2v-kx2w","DOIUrl":"https://doi.org/10.1103/8y2v-kx2w","url":null,"abstract":"The interplay of high-order Van Hove singularities and topology plays a central role in determining the nature of the electronic correlations governing the phase of a system with unique signatures characterizing their presence. Layered van der Waals heterostuctures are ideal systems for band engineering through the use of twisting and proximity effects. Here, we use symmetry to demonstrate how twisted kagome bilayers can host topological high-order Van Hove singularities. We study a commensurate system with a large twist angle and demonstrate how the initial choice of high-symmetry stacking order can greatly influence the electronic structure and topology of the system. Furthermore, we study the possibility of sublattice interference in the system. Our results illustrate the rich energy landscape of twisted kagome bilayers and unveil large Chern numbers (of order 10), establishing twisted bilayer kagome as a natural playground for probing the mixing of strong correlations and topology.","PeriodicalId":20082,"journal":{"name":"Physical Review B","volume":"47 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145717897","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}
S. Pylypenko, M. Winter, U. K. Rößler, D. Pohl, R. Kyrychenko, M. C. Rahn, B. Achinuq, J. R. Bollard, P. Vir, G. van der Laan, T. Hesjedal, J. Schultz, B. Rellinghaus, C. Felser, A. Lubk
Disordered two-dimensional (2D) lattices, including hexatic and various glassy states, are observed in a wide range of 2D systems including colloidal nanoparticle assemblies and fluxon lattices. Their disordered nature determines the stability and mobility of these systems, as well as their response to the external stimuli. Here we report on the controlled creation and characterization of a disordered 2D lattice of nontopological magnetic bubbles in the noncentrosymmetric ferrimagnetic alloy Mn 1.4 PtSn . By analyzing the type and frequency of fundamental lattice defects, such as dislocations, the orientational correlation, as well as the induced motion of the lattice in an external field, a nonergodic glassy state, stabilized by directional application of an external field, is revealed.
{"title":"Microscopic observation of nonergodic states in two-dimensional nontopological bubble lattices","authors":"S. Pylypenko, M. Winter, U. K. Rößler, D. Pohl, R. Kyrychenko, M. C. Rahn, B. Achinuq, J. R. Bollard, P. Vir, G. van der Laan, T. Hesjedal, J. Schultz, B. Rellinghaus, C. Felser, A. Lubk","doi":"10.1103/ccxm-l6hx","DOIUrl":"https://doi.org/10.1103/ccxm-l6hx","url":null,"abstract":"Disordered two-dimensional (2D) lattices, including hexatic and various glassy states, are observed in a wide range of 2D systems including colloidal nanoparticle assemblies and fluxon lattices. Their disordered nature determines the stability and mobility of these systems, as well as their response to the external stimuli. Here we report on the controlled creation and characterization of a disordered 2D lattice of nontopological magnetic bubbles in the noncentrosymmetric ferrimagnetic alloy Mn</a:mi> 1.4</a:mn> </a:mrow> </a:msub> PtSn</a:mi> </a:mrow> </a:math> . By analyzing the type and frequency of fundamental lattice defects, such as dislocations, the orientational correlation, as well as the induced motion of the lattice in an external field, a nonergodic glassy state, stabilized by directional application of an external field, is revealed.","PeriodicalId":20082,"journal":{"name":"Physical Review B","volume":"8 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145717896","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}
Manik Kuila, B. Maharana, B. Samantaray, Z. Hossain
{"title":"Current-induced spin-orbit torque and thermal effects in CoFe/Pt heterostructures via second and third harmonic Hall measurements","authors":"Manik Kuila, B. Maharana, B. Samantaray, Z. Hossain","doi":"10.1103/b4gw-81cf","DOIUrl":"https://doi.org/10.1103/b4gw-81cf","url":null,"abstract":"","PeriodicalId":20082,"journal":{"name":"Physical Review B","volume":"170 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145732274","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}
{"title":"Gap anisotropy in layered superconductors due to Rashba and Dresselhaus spin-orbit interactions","authors":"Bahruz Suleymanli, B. Tanatar","doi":"10.1103/bfhr-5bnc","DOIUrl":"https://doi.org/10.1103/bfhr-5bnc","url":null,"abstract":"","PeriodicalId":20082,"journal":{"name":"Physical Review B","volume":"46 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145732275","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}
{"title":"Quantitative measure of topological protection in Floquet systems through the spectral localizer","authors":"Stephan Wong, Alexander Cerjan, Justin T. Cole","doi":"10.1103/3y9q-jpbm","DOIUrl":"https://doi.org/10.1103/3y9q-jpbm","url":null,"abstract":"","PeriodicalId":20082,"journal":{"name":"Physical Review B","volume":"14 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145732279","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}
Altermagnets are an emerging class of unconventional antiferromagnets, characterized by a Néel ordering that does not break the translational symmetry of the underlying lattice. Depending on the orientation of the Néel vector, the anomalous Hall effect (AHE) may or may not exist. In the so-called pure altermagnets, the AHE is forbidden by magnetic symmetry. Here, we demonstrate that in pure altermagnets, domain walls can lift the symmetry constraints, thereby activating the AHE and orbital magnetization. Taking a representative example of a rutile-lattice tight-binding minimal model in slab geometry, we use linear response theory to demonstrate the emergence of the domain-wall AHE, finding that it is closely related to the orbital magnetization, while the spin magnetization does not play a significant role. Using Landau theory, we argue that, while for a random arrangement of π domain walls, the contributions from the individual domain walls will cancel one another, an external magnetic field will favor domain-wall arrangements with specific chirality giving rise to a net AHE signal. Using group theory, we discuss how these findings can be straightforwardly generalized to certain other classes of altermagnets. Our work reveals a crucial role for domain walls in understanding Hall transport and orbital magnetism of altermagnets. Our work generally calls for a rigorous analysis of Hall-transport data for an altermagnet, ideally in conjunction with imaging data, in order to unambiguously assign an observed Hall effect to magnetic domains or to domain walls.
{"title":"Activation of anomalous Hall effect and orbital magnetization by domain walls in altermagnets","authors":"Sopheak Sorn, Yuriy Mokrousov","doi":"10.1103/vzmh-mxlz","DOIUrl":"https://doi.org/10.1103/vzmh-mxlz","url":null,"abstract":"Altermagnets are an emerging class of unconventional antiferromagnets, characterized by a Néel ordering that does not break the translational symmetry of the underlying lattice. Depending on the orientation of the Néel vector, the anomalous Hall effect (AHE) may or may not exist. In the so-called pure altermagnets, the AHE is forbidden by magnetic symmetry. Here, we demonstrate that in pure altermagnets, domain walls can lift the symmetry constraints, thereby activating the AHE and orbital magnetization. Taking a representative example of a rutile-lattice tight-binding minimal model in slab geometry, we use linear response theory to demonstrate the emergence of the domain-wall AHE, finding that it is closely related to the orbital magnetization, while the spin magnetization does not play a significant role. Using Landau theory, we argue that, while for a random arrangement of π</a:mi> </a:math> domain walls, the contributions from the individual domain walls will cancel one another, an external magnetic field will favor domain-wall arrangements with specific chirality giving rise to a net AHE signal. Using group theory, we discuss how these findings can be straightforwardly generalized to certain other classes of altermagnets. Our work reveals a crucial role for domain walls in understanding Hall transport and orbital magnetism of altermagnets. Our work generally calls for a rigorous analysis of Hall-transport data for an altermagnet, ideally in conjunction with imaging data, in order to unambiguously assign an observed Hall effect to magnetic domains or to domain walls.","PeriodicalId":20082,"journal":{"name":"Physical Review B","volume":"156 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145673602","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}
{"title":"Family of multilayer graphene superconductors with tunable chirality: Momentum-space vortices nucleated by a ring of Berry curvature","authors":"Adarsh S. Patri, Marcel Franz","doi":"10.1103/pgqh-wm5v","DOIUrl":"https://doi.org/10.1103/pgqh-wm5v","url":null,"abstract":"","PeriodicalId":20082,"journal":{"name":"Physical Review B","volume":"1 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145673600","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}
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