Journal of physics. Condensed matter : an Institute of Physics journal最新文献

{"title":"Electrical Readout of Neutral Magnon Hall Transport by Altermagnetic Edges.","authors":"Gyanti Prakash Moharana","doi":"10.1088/1361-648X/aeb522","DOIUrl":"https://doi.org/10.1088/1361-648X/aeb522","url":null,"abstract":"<p><p>We develop a boundary theory for electrical readout of neutral magnon Hall transport at a magnetic-insulator-metal interface. For the number-conserving collinear regime considered here, a thermal gradient drives distinct Berry-curvature magnon number, spin, and energy Hall currents. Spin-active exchange absorbs incident magnons and injects angular momentum into a metallic detector. Its spin-odd tangential velocity converts the resulting electron-hole packet into an edge current. For a d-wave altermagnet, (J_y^{mathrm{edge}}=-2elambda_{mathrm{AM}}sin2theta,dot S_N), whereas a spin-degenerate (PT)-symmetric collinear antiferromagnet has vanishing response in this nonrelativistic channel. The mode-resolved law weights each incident Hall component by its magnon spin projection and absorption probability. For a scalar-chirality kagome source, (kappa_{xy}^{m,mathrm{tr}}proptophi T^3) in the quasi-two-dimensional infrared regime. A strong-absorption crossover yields (J_y^{mathrm{edge}}propto T^2). Chirality and Néel-vector reversals, principal-axis nodes, and a (90^circ) rotation provide direct symmetry tests.</p>","PeriodicalId":520686,"journal":{"name":"Journal of physics. Condensed matter : an Institute of Physics journal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2026-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149198834","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}

{"title":"Lateral finite-size effect of flat-band spectral weight in Kagome metal CoSn.","authors":"Weixiong Hu, Huanyu Liu, Zhongzheng Yang, Xuefeng Zhang, Wenxin Lv, Chenhaoping Wen, Gang Li, Hechang Lei, Shichao Yan","doi":"10.1088/1361-648X/aeadff","DOIUrl":"10.1088/1361-648X/aeadff","url":null,"abstract":"<p><p>Driven by their unique lattice structure, Kagome systems exhibit fascinating properties, prominent among which is the emergence of flat bands. Here we report a scanning tunneling microscopy and spectroscopy study on the lateral finite-size effect of flat-band spectral weight in the Kagome metal CoSn. We identify two distinct cleaved surfaces: Co₃Sn and Sn₂. On the Co₃Sn surface, we detect two electronic peaks located at 70 and 250 mV below the Fermi level, which correspond to the flat bands originating from Co<i>d</i>orbitals. Notably, the flat-band intensity exhibits a strong dependence on the lateral size of the Kagome islands. The flat bands start to emerge in Co₃Sn islands consisting of only a half-unit-wide Kagome chain. As the island width increases, the flat-band intensity rises exponentially and reaches saturation when the island width reaches four-unit cells or larger. By analyzing the size-dependent intensity data, we extract the characteristic length scale for this saturation behavior. Furthermore, on the large Co₃Sn surface, we observe a broad and non-dispersive wavevector with a periodicity close to √3×√3 in the Fourier-transformed differential conductance maps. These results not only reveal the novel lateral finite-size effect of flat-band spectral weight at the atomic scale, but also pave the way for a deeper understanding of the complex electronic structures in Kagome materials.</p>","PeriodicalId":520686,"journal":{"name":"Journal of physics. Condensed matter : an Institute of Physics journal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2026-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149083751","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}

{"title":"Manipulation of waves in polariton topological insulators.","authors":"Tong Ling, Yiming Ning, Songlei Huang, Chunyan Li","doi":"10.1088/1361-648X/aeaa03","DOIUrl":"10.1088/1361-648X/aeaa03","url":null,"abstract":"<p><p>As a frontier in condensed matter physics, the concept of topological insulators has been successfully extended from electronic systems to photonic systems and even to structured microcavities, where strong photon-exciton coupling gives rise to hybrid part-light, part-matter exciton-polaritons quasiparticles. Polaritons inherit the low-loss, tunable characteristics of photons while retaining strong excitonic nonlinear interactions, offering an ideal nonequilibrium platform for exploring topological states. This review systematically surveys the progress of topological insulators in exciton-polariton systems, with emphasis on their underlying physical mechanisms, exotic quantum phenomena induced by various strategies, and the impact of nonlinear effects on topological states. Finally, we discuss the key challenges currently facing this field and provide an outlook on future research directions.</p>","PeriodicalId":520686,"journal":{"name":"Journal of physics. Condensed matter : an Institute of Physics journal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2026-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149003287","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}

{"title":"Classifying coherent peaks in nanoelectronic devices by the presence or absence of spin exchange.","authors":"Jongbae Hong","doi":"10.1088/1361-648X/aea9e3","DOIUrl":"10.1088/1361-648X/aea9e3","url":null,"abstract":"<p><p>Coherent peaks appearing in the differential conductance of quantum-dot single-electron transistors (QDSETs) and quantum point contact (QPC) devices are classified into two categories according to the scaling function onto which the temperature-scaled differential-conductance maxima collapse and the underlying spin dynamics. The zero-bias peaks (ZBPs) observed in QPCs and in the triplet state of the even-particle sector of QDSETs belong to the same category, whereas the ZBP in the odd-particle sector of a QDSET belongs to a different category together with all finite-bias coherent peaks observed in QPCs and in the even-particle sector of QDSETs. The spin dynamics of the former category involve spin exchange, a hallmark of Kondo dynamics, whereas those of the latter category involve only cotunneling of an up-down spin pair. Furthermore, for the former type of ZBP, the scaling temperature coincides with one-half of the full width at half maximum (FWHM), which corresponds to the Kondo temperature. In contrast, for the latter type, the scaling temperature does not coincide with the (1/2)FWHM-derived energy scale. To support these findings, the gate-voltage-dependent differential-conductance line shapes measured in the odd-particle sector of a QDSET are theoretically reproduced. The results demonstrate that the observed ZBP is a merging of two coherent side peaks generated solely by the cotunneling of up-down spin pairs.</p>","PeriodicalId":520686,"journal":{"name":"Journal of physics. Condensed matter : an Institute of Physics journal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2026-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149003291","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}

{"title":"Topological rescue and structural symmetry breaking of skyrmion lattices in synthetic antiferromagnetic bilayers.","authors":"Gülşen Doğan, Ümit Akıncı","doi":"10.1088/1361-648X/aeac95","DOIUrl":"10.1088/1361-648X/aeac95","url":null,"abstract":"<p><p>Synthetic antiferromagnetic (SAF) bilayers provide a highly promising platform for next-generation spintronics by eliminating stray fields and the skyrmion Hall effect. In this study, we investigate the field-driven phase evolution and thermodynamic stability of topological spin textures in SAF bilayers using Monte Carlo simulations based on a minimal, purely isotropic two-dimensional classical Heisenberg model. By systematically varying the interlayer exchange coupling across different external magnetic field regimes, we uncover distinct topological phase transitions dictated by the energetic competition between Zeeman alignment, Dzyaloshinskii-Moriya interaction (DMI), and interlayer coupling. Crucially, despite the absence of any structural asymmetries or staggered interactions, we observe a striking spontaneous structural symmetry breaking at intermediate fields, where the skyrmion lattice (SKX) distorts into a frustrated multi-state with a unique 8-peak structure factor. This energetic struggle further culminates at extreme magnetic fields, where the SAF bilayer demonstrates a profound 'Topological Rescue' effect in a regime where standard monolayers are completely field-polarized and topologically dead. We show that the antiferromagnetic coupling acts as a thermodynamic shield, reviving a dense and stable SKX from the saturated background. A comprehensive differential energy analysis proves that this rescue mechanism is governed by a strict energetic trade-off: the system accepts a penalty in Zeeman and intralayer exchange energies to unlock massive synergistic gains from the DMI and interlayer exchange. Our findings establish the exact thermodynamic boundaries of these transitions in a perfectly aligned lattice, highlighting the immense potential of tuning interlayer coupling for the design of robust, field-immune topological memory and logic switches.</p>","PeriodicalId":520686,"journal":{"name":"Journal of physics. Condensed matter : an Institute of Physics journal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2026-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149067088","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}

{"title":"Magnetization plateaux of the S = 5/2 antiferromagnetic chain with anisotropies.","authors":"Tomoki Houda, Kiyomi Okamoto, Hiroki Nakano, Toru Sakai","doi":"10.1088/1361-648X/aeb3e5","DOIUrl":"https://doi.org/10.1088/1361-648X/aeb3e5","url":null,"abstract":"<p><p>The magnetization process of the S=5/2 antiferromagnetic chain with coupling and single-ion anisotropies is investigated using numerical diagonalization of finite-size clusters and level spectroscopy analysis. Various magnetization plateaux are found at 1/5, 2/5, 3/5, and 4/5 of the saturation magnetization. Plateaux without translational symmetry breaking are predicted to occur at 1/5 and 3/5 magnetization. A symmetry-protected topological plateau phase is found at 3/5 magnetization, but not at 1/5. In addition translational-symmetry-broken plateaux induced by large coupling anisotropy are found at 1/5, 2/5, 3/5, and 4/5 magnetization. Phase diagrams at 1/5, 2/5, 3/5, and 4/5 of the saturation magnetization are obtained. Magnetization curves for several representative anisotropies are also presented, together with the corresponding magnetic phase diagrams.</p>","PeriodicalId":520686,"journal":{"name":"Journal of physics. Condensed matter : an Institute of Physics journal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2026-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149187815","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}

{"title":"Phase-Controlled Logic in a Y-Shaped Phononic Network with Dynamic Junction Inertia.","authors":"Samila F da S Oliveira, Marcelo L Lyra","doi":"10.1088/1361-648X/aeb3e4","DOIUrl":"https://doi.org/10.1088/1361-648X/aeb3e4","url":null,"abstract":"<p><p>We investigate wave scattering and programmable logic operations in a Y-shaped network of coupled harmonic chains connected through a tunable junction mass. Using stationary scattering theory, we derive analytical expressions for the transmission amplitude under coherent excitation of the two input branches with arbitrary relative phase. The interplay between wave interference and the spectral response of the junction enables the implementation of Boolean logic operations through a threshold criterion applied to the transmitted intensity. We further explore three models of dynamic effective mass, with frequency, amplitude, and velocity-dependent responses, which provide distinct mechanisms for tuning the transmission spectrum and the operating regions of the logic gates. The nonlinear models exhibit self-consistent transmission and bistable behavior, offering enhanced flexibility for programmable phononic logic. The proposed architecture provides a versatile platform for wave-based information processing in mechanical metamaterials devices.</p>","PeriodicalId":520686,"journal":{"name":"Journal of physics. Condensed matter : an Institute of Physics journal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2026-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149187797","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}

{"title":"Spin segregation of nonrelativistic charged particles by a helical magnetic field slab.","authors":"D Martínez, J A Reyes, A Lima","doi":"10.1088/1361-648X/aeae01","DOIUrl":"10.1088/1361-648X/aeae01","url":null,"abstract":"<p><p>We study a beam of nonrelativistic spin-charge carriers incident normally on a finite slab of helical magnetic field aligned along the beam axis. Starting from the Pauli-Schrödinger equation, we apply a unitary transformation expressed in terms of Pauli matrices to map the system to a spatially independent eigenvalue problem, from which the energy band structure is obtained analytically. Our results reveal two types of bandgap controlled by the field strength: a partial bandgap present for all field values, in which only one spin channel propagates, and a total bandgap that opens above a threshold field strength, in which both channels are evanescent. Using the eigenvectors and a transfer matrix approach, we solve the boundary value problem at the vacuum-magnetic interface and obtain spin-preserving and spin-flip transmittances and reflectances as functions of field strength and energy. The spin-filtering properties are discussed in terms of the alignment of the spin eigenstates with the effective field in spin space, with the Bloch sphere providing a geometric picture of the spin-channel selection mechanism.</p>","PeriodicalId":520686,"journal":{"name":"Journal of physics. Condensed matter : an Institute of Physics journal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2026-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149083752","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}

{"title":"Force-isosurface simulations probe the limits of high-resolution AFM on three-dimensional molecules.","authors":"E J Dunn, R J Young, S P Jarvis","doi":"10.1088/1361-648X/aeadfe","DOIUrl":"10.1088/1361-648X/aeadfe","url":null,"abstract":"<p><p>High-resolution atomic force microscopy has transformed molecular imaging by revealing intramolecular structure directly in real space. A major remaining challenge is to extend this capability from largely planar molecules to non-planar molecular systems, where the most important structural information may be distributed across different heights above the surface. Here we use probe-particle-model simulations to predict the constant-force contours expected above molecules with increasing structural complexity. By extractingisosurfaces from simulated three-dimensional force fields, we compare the molecular information retained in constant-height and constant-force images. For tilted benzene and pyrrole, constant-force images preserve the molecular framework across a range of adsorption angles and allow the molecular orientation to be recovered quantitatively. For larger non-planar and three-dimensional systems, simulations identify characteristicisosurface contrast associated with adsorption geometry, lower-lying molecular structure and curved molecular surfaces. These results provide target contrast patterns forisosurfaces obtainable from three-dimensional force-mapping experiments and quantify the molecular information retained by idealisosurface imaging as molecular systems become progressively non-planar.</p>","PeriodicalId":520686,"journal":{"name":"Journal of physics. Condensed matter : an Institute of Physics journal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2026-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149083783","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}

{"title":"Magnetic ordering in VI3: a van der Waals material combining vastly different magnetic anisotropies.","authors":"K K Pokhrel, S Ray, N Macháčová, A Koliogiorgos, K Carva","doi":"10.1088/1361-648X/aea9e0","DOIUrl":"10.1088/1361-648X/aea9e0","url":null,"abstract":"<p><p>Among magnetic van der Waals materials, the vanadium trihalide family exhibits unique features. In particular,can contain two types of V atoms because two electronic occupations are energetically close and may coexist in real samples. These types have strikingly different magnetic anisotropies, predicted to differ by more than an order of magnitude.also shows an unusual thickness dependence: the reported monolayer Curie temperature,, is higher than that of the bulk, contrary to the usual expectation that interlayer coupling reinforces magnetic order. Here, we use atomistic spin-dynamics simulations to study critical temperatures infrom the combined perspective of single-ion anisotropy and exchange interactions, aiming to identify the microscopic origin of the bulk-monolayer anomaly. We consider a system composed of two V types with properties predicted by first-principles calculations. The anisotropy contrast strongly affects thermal stability: increasing the fraction of high-anisotropy sites raises the energy cost of transverse spin fluctuations and increases. At the same time, the interlayer super-superexchange network is modified by the inhomogeneous V environment. It becomes spatially non-uniform and can contain competing exchange pathways, weakening coherent interlayer magnetic order while preserving robust intralayer ferromagnetic correlations. Our results show that changing the ratio of the two V types can cause a substantial shift in. The experimental bulk value is reproduced when the ratio is close to 1:1, consistent with two experimental indications of coexisting V configurations. Thus, the finite-temperature magnetization behavior provides further support for the coexistence of two V configurations in. The experimentally observed monolayeris obtained for a slightly modified ratio, which may be related to the polaron concentration. The sensitivity ofto the HO/LO ratio suggests that the ordering temperature ofcould be tuned over a broad range by controlling the relative occupation of the two vanadium configurations.</p>","PeriodicalId":520686,"journal":{"name":"Journal of physics. Condensed matter : an Institute of Physics journal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2026-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149003271","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}