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

{"title":"ERRATUM: Concerning 5f electron correlation in δ-Pu (2026<i>J. Phys.: Condens. Matter</i> 38 30LT01).","authors":"J G Tobin, P Roussel","doi":"10.1088/1361-648X/ae9e23","DOIUrl":"https://doi.org/10.1088/1361-648X/ae9e23","url":null,"abstract":"","PeriodicalId":520686,"journal":{"name":"Journal of physics. Condensed matter : an Institute of Physics journal","volume":"38 37","pages":""},"PeriodicalIF":0.0,"publicationDate":"2026-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148972994","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":"Compact localized states and magnetic flux-driven topological phase transition in a diamond-dodecagon lattice geometry.","authors":"Joydeep Majhi, Biplab Pal","doi":"10.1088/1361-648X/ae9dd8","DOIUrl":"10.1088/1361-648X/ae9dd8","url":null,"abstract":"<p><p>We propose and investigate a novel two-dimensional (2D) tight-binding model defined on a diamond-dodecagon lattice geometry that hosts multiple flat bands (FBs) and supports topological phase transitions driven by a magnetic flux. This lattice exhibits three completely flat, non-dispersive bands in the band structure in the absence of magnetic flux due to destructive interference in the electron hoppings, leading to the emergence of compact localized states (CLS). These CLS are analytically constructed and exhibit real-space confinement of the electrons, arising solely due to the lattice's geometrical frustration. It has been shown that these FBs are very robust against the introduction of weak random onsite disorder in the system. By tuning the uniform magnetic flux threaded through the diamond plaquettes, we demonstrate a tunable evolution of the band structure and show that certain bands develop nontrivial topological features with nonzero integer values of the Chern number. Additionally, we have computed the multi-terminal transport properties for this 2D lattice system, which display the flux-tunable resonances and transmission suppression linked to the FBs, establishing a clear interplay between the localization, topology, and transport. Our findings put forward the diamond-dodecagon lattice as a robust and tunable platform for studying the FB physics and magnetic flux-controlled topological phenomena, offering promising experimental feasibility in photonic lattices and ultracold atomic systems.</p>","PeriodicalId":520686,"journal":{"name":"Journal of physics. Condensed matter : an Institute of Physics journal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2026-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148815272","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":"Coexistent chiral phonons and multiple topological states with van-hove singularities in non-centrosymmetric<i>XYZ</i>(<i>X</i>= Ni, Pt, Pd;<i>Y</i>= Sb, Bi;<i>Z</i>= S, Se) family: an<i>ab-initio</i>study.","authors":"Bibhash Paul, Sreeparvathy Puthiya Covilakam, Deng-Chi Wang, Aniceto B Maghirang Iii, Zhi-Quan Huang, Feng-Chuan Chuang","doi":"10.1088/1361-648X/ae9c15","DOIUrl":"10.1088/1361-648X/ae9c15","url":null,"abstract":"<p><p>Non-symmorphic chiral crystals can host unconventional higher-fold topological excitations with long Fermi arcs. On the other hand, phonons in chiral materials possess a non-zero angular momentum, leading to the generation of chiral phonons. This work reports the coexistence of higher-fold topological and chiral phonons, accompanied by multiple types of conventional and unconventional fermions in ternary chiral crystals<i>XYZ</i>(<i>X</i>=Ni, Pt, Pd;<i>Y</i>=Sb, Bi;<i>Z</i>=S, Se). Our detailed study reveals symmetry-protected spin-1 Weyl and charge-2 Dirac topological phonon states in the phonon spectrum, as well as nonzero phonon angular momentum, thereby confirming their chiral nature. Interestingly, the electronic states exhibit multiple types of topological fermionic states under spin-orbit coupling. Moreover, a close examination of the density of states reveals van Hove singularities (VHSs)near the Fermi level, which may indicate possible superconductivity and warrant further experimental studies. Our findings highlight the coexistence of chiral and higher-fold topological phonons, multiple topological states in both phononic and electronic realms, and VHS in the studied ternary chiral crystals, which may serve as a basis for future topological device applications.</p>","PeriodicalId":520686,"journal":{"name":"Journal of physics. Condensed matter : an Institute of Physics journal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2026-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148805360","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":"Coherent-state ansatz for the Holstein polaron in one and two dimensions.","authors":"Connor M Walsh, Igor Boettcher, Frank Marsiglio","doi":"10.1088/1361-648X/ae9dd1","DOIUrl":"10.1088/1361-648X/ae9dd1","url":null,"abstract":"<p><p>The Holstein model often serves as an archetype for electron-phonon interactions and polaron formation in solids. However, precise descriptions of the Holstein polaron are difficult when the phonon frequency is small and the electron-phonon coupling is strong, due to the presence of many phonons in the ground-state. We present a semi-analytical approximation that consists of a variational ansatz with clouds of phonons surrounding the electron in the form of coherent states. This becomes particularly simple and exact in the Lang-Firsov limit. We determine the domain of validity away from this limit, and further explore the improvement achieved with a removal of the requirement that the phonon clouds form coherent states. Both approximations work extremely well for the ground-state energy at strong coupling, and both work surprisingly well also at weak-coupling. For the effective mass, however, both approximations have difficulty, particularly in the crossover region. Moreover, the coherent-state ansatz (CSA) retains an unphysical jump in the crossover region. Nonetheless, the CSA provides a simple and intuitive picture of the polaron ground-state wavefunction, and in addition predicts accurate values for the ground-state energy.</p>","PeriodicalId":520686,"journal":{"name":"Journal of physics. Condensed matter : an Institute of Physics journal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2026-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148815047","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":"Twist-induced chiral phonon coupling in carbon nanotubes from nonlinear elasticity.","authors":"Naoki Nishimura, Mamoru Matsuo, Takeo Kato","doi":"10.1088/1361-648X/aea049","DOIUrl":"10.1088/1361-648X/aea049","url":null,"abstract":"<p><p>Twisted carbon nanotubes support phonons involving not only torsion, naturally associated with microrotation, but also radial breathing, which requires a scalar stretch degree of freedom. We derive an effective microstretch theory for these modes starting from nonlinear elasticity on a cylindrical surface. By linearizing the equation of motion around a uniformly twisted equilibrium configuration, we obtain the dynamical matrix for the twisting, longitudinal, and radial-breathing modes. This matrix coincides with that of a one-dimensional microstretch theory, and the corresponding elastic constants are expressed in terms of the Lamé constants, the nanotube radius, and the twist rate. The twist generates chiral couplings in the effective theory, which hybridize the three modes and open an anticrossing in the phonon dispersion. We also discuss the relation between this twist-induced mechanism and intrinsic chirality in chiral nanotubes, where symmetry allows analogous effective chiral couplings even without an externally applied twist. These results provide a microscopic basis for the microstretch description of phonons in twisted carbon nanotubes and clarify how structural chirality enters the effective couplings.</p>","PeriodicalId":520686,"journal":{"name":"Journal of physics. Condensed matter : an Institute of Physics journal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2026-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148852190","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":"Ductile Dirac-like semimetal SrSn₃for flexible optoelectronics.","authors":"Jamal Uddin Ahamed, Maitry Barua, Farid Alam, M D Khairul Kabir Fakir","doi":"10.1088/1361-648X/ae9e76","DOIUrl":"10.1088/1361-648X/ae9e76","url":null,"abstract":"<p><p>The development of mechanically compliant quantum materials with nontrivial electronic states and strong light-matter interactions is an important frontier for flexible optoelectronics and strain-engineered devices. In this research, we systematically investigate the structural, elastic, electronic, and optical properties of cubic intermetallic SrSn₃, using first-principles density functional theory. Our calculations establish the dynamical stability of SrSn₃and reveal a semimetallic electronic structure featuring Dirac-like linear band crossings near the Fermi level, accompanied by a remarkably soft mechanical response that contrasts strongly with the comparatively brittle CaSn₃. SrSn₃exhibits an exceptionally low Pugh's ratio (<i>G</i>/<i>B</i>= 0.19), a low Vickers hardness (<i>H_v</i>= 0.54 GPa), and nearly isotropic elastic behavior, indicating a pronounced ductile tendency and strong mechanical compliance. The electronic structure features robust linear band crossings along the Γ-X and R-X high-symmetry directions, with substantial contributions from the hybridization of Sr-3d and Sn-5p states. These electronic characteristics are accompanied by a pronounced broadband optical response, including an infrared plasmon resonance, high optical conductivity, and strong interband absorption exceeding 10⁵cm^-1across broad regions of the visible-to-ultraviolet spectrum. Furthermore, strain-dependent calculations demonstrate that the electronic states and optical characteristics, including absorption edges and plasmonic features, can be systematically modulated within the investigated strain range of -4% to +4%. The combination of Dirac-like semimetallic behavior, exceptional mechanical compliance, and strain-tunable optical functionality highlights SrSn₃as a promising platform for flexible photodetectors, wearable optoelectronics, and mechanically deformable quantum-device architectures.</p>","PeriodicalId":520686,"journal":{"name":"Journal of physics. Condensed matter : an Institute of Physics journal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2026-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148820852","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":"Coexisting long-range zigzag antiferromagnetic order and glassy dynamics in spin-1 honeycomb lattice Na₃Ni₂SbO₆.","authors":"R K Patel, B Saha, Debashish Das, A K Bera, Kranti Kumar, Chandrani Nath, V R Singh, Kenta Amemiya, K Asokan, S M Yusuf, M P Saravanan, Aftab Alam, A K Pramanik","doi":"10.1088/1361-648X/ae9fa7","DOIUrl":"10.1088/1361-648X/ae9fa7","url":null,"abstract":"<p><p>Here, we report an interesting magnetic oxide NaNiSbO, where the interplay between exchange interactions and lattice symmetry crucially influence its exotic ground state (GS). This compound features a layered honeycomb lattice with magnetic Ni(spin-1) surrounding nonmagnetic Sbcenters. The x-ray absorption and magnetic circular dichroism measurements confirm a Nicharge state with notable spin and orbital moments at room temperature. The material exhibits antiferromagnetic (AFM) ordering around 17 K () and a field-induced magnetic transition at lower temperatures. Our measurements reveal a low-temperature anomaly, likely linked to glassy behavior. The power-law magnetic specific heat suggests mixed magnon dispersion, while low magnetic entropy indicates a highly degenerate GS. Neutron diffraction data point to a zigzag-type AFM GS, with a reduced site moment of 1.34(3)at 2.5 K that disappears near 17.2 K, consistent with bulk data. Lattice parameters show anomalies atand lower temperatures. Ab-initio calculations support zigzag spin order and imply a competing in-plane Niinteractions that causes spin frustration. Overall, our combined experimental and theoretical study uncovers the microscopic magnetic GS of NaNiSbOas a mix of long-range zigzag AFM and a glassy state, advancing the understanding of frustrated honeycomb magnets.</p>","PeriodicalId":520686,"journal":{"name":"Journal of physics. Condensed matter : an Institute of Physics journal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2026-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148842755","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":"Enhanced electron-phonon coupling near an electronic quantum phase transition: beyond the adiabatic approximation.","authors":"Samuel P J Ladd, Sachit Chavda, Rosie Sibley, Nikitas Gidopoulos","doi":"10.1088/1361-648X/ae99c1","DOIUrl":"10.1088/1361-648X/ae99c1","url":null,"abstract":"<p><p>We revisit the enhancement of electron-phonon coupling predicted near an electronic quantum phase transition in a two-state, one-phonon model. In an earlier analysis, one of us predicted that the diagonal Born-Oppenheimer correction (DBOC) generated a sharp barrier in the potential-energy surface, localised low-lying phonon states on either side of the transition point, and produced a pronounced hardening of the phonon modes. Here we ask whether this enhanced coupling survives in the exact coupled electron-phonon problem. We solve the full model by direct diagonalisation, obtaining the exact coupled electron-phonon excitation spectrum, and analyse its ground state using the parametric representation of the electron-nuclear wavefunction. We find that the exact solution recovers the adiabatic picture obtained by including the DBOC when the electronic levels are well separated, but that this picture is progressively smoothed and weakened as the electronic and phononic energy scales become comparable. In the near-degenerate regime, the exact solution crosses over to a diabatic description. Thus, the associated localisation and phonon-hardening signatures are not artefacts of the BO approximation, but survive in renormalised form in the exact theory when the electronic levels remain sufficiently well separated.</p>","PeriodicalId":520686,"journal":{"name":"Journal of physics. Condensed matter : an Institute of Physics journal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2026-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148765901","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":"Material-scale effective-band-edge theory of charged-domain-wall bound states in α-In2Se3.","authors":"Ye Zhou","doi":"10.1088/1361-648X/aea510","DOIUrl":"https://doi.org/10.1088/1361-648X/aea510","url":null,"abstract":"<p><p>Charged ferroelectric domain walls in two-dimensional semiconductors provide a route to rewritable&#xD;one-dimensional electronic channels, but the relation between atomic reconstruction and transverse&#xD;confinement is not transparent from either macroscopic electrostatics or first-principles calculations&#xD;alone. Motivated by recent atomic-resolution studies of α-In2Se3, where head-to-head walls contain&#xD;a nonpolar β-like intercalated layer whereas tail-to-tail walls remain atomically abrupt, we develop&#xD;a material-scale effective-band-edge theory for transverse domain-wall bound states. The material&#xD;input is used as deliberately broad consistency windows, not as a direct fit to digitized density-&#xD;functional or spectroscopic band-edge profiles. The smooth sector is exactly solvable: a lowest-order&#xD;local band-edge ansatz reduces neutral walls to the Pöschl-Teller class and charged walls to the&#xD;asymmetric Rosen-Morse class. This yields closed-form spectra, wave-function skewness, and exact&#xD;delocalization boundaries. The same solution gives a useful constraint on smooth confinement:&#xD;states near the localization boundary collapse onto the lower continuum edge, so smooth band&#xD;bending alone does not, within the material windows considered here, simultaneously reproduce&#xD;the HH depth, width, and center locking. We then add the minimal HH structural correction,&#xD;represented by a central short-range β-layer lowering, and analyze both its δ-layer limit and finite-&#xD;width implementations. Material-scale anchoring to effective masses, nanometer-scale wall widths,&#xD;and structural energy scales relevant to α-In2Se3 supports a branch-selective picture: the abrupt&#xD;TT wall is naturally described as a shallow hole-like effective band-bending channel, whereas the&#xD;reconstructed HH wall is described by an electron-like smooth baseline supplemented by a central&#xD;β-layer lowering. The theory provides a compact intermediate description connecting atomistic&#xD;charged-wall reconstruction to mesoscopic one-dimensional confinement.</p>","PeriodicalId":520686,"journal":{"name":"Journal of physics. Condensed matter : an Institute of Physics journal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2026-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148922604","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":"The application of a fluctuating charge model to boron nitride/carbon composite two-dimensional networks.","authors":"Angus Heafield, Mark Wilson","doi":"10.1088/1361-648X/ae8a2c","DOIUrl":"10.1088/1361-648X/ae8a2c","url":null,"abstract":"<p><p>A model is developed to consider two-dimensional composite networks of BN and C. The fluctuating charge model allows for charge to 'flow' between atom sites depending on their relative electronegativities and the (local) atom environment. A range of both topological and site disorder are considered, ranging from single defects to pure site disorder on an ideal hexagonal lattice, to the formation of BN and C domains on both the hexagonal lattice and on amorphous networks constructed with varying degrees of topological disorder. Two Monte Carlo-based methods are employed to control the topological and site disorder. The site charges are dependent on the local environment both in terms of the coordination and topology and are found to be important in controlling domain growth.</p>","PeriodicalId":520686,"journal":{"name":"Journal of physics. Condensed matter : an Institute of Physics journal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2026-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148440302","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}