Showing 77 results for Author: Tom Berlijn
Sep, 2026
Journal
Motivated by the experimental identification of magnetic compounds consisting of zigzag chains, we analyze the band structure topology of magnons in ferromagnets on a zigzag lattice. We account for the general lattice geometry by including spatially anisotropic Heisenberg exchange interactions and by Dzyaloshinskii-Moriya interaction on inversion asymmetric bonds. Within t…
Apr, 2026
Journal
The phenomenon of Anderson localization in various disordered media has sustained significant interest over many decades. Specifically, the Anderson localization of phonons has been viewed as a potential mechanism for creating fascinating thermal transport properties in materials. However, despite extensive work, the influence of the vector nature of phonons on the Anderso…
Apr, 2026
Journal
Many-body excitons in CrSBr are attracting intense interest in view of their highly anisotropic magneto-optical coupling and their potential for novel optical interfaces within spintronic and magnonic devices. Characterizing the orbital character and propagation of these electronic excitations is crucial for understanding and controlling their behavior; however, this infor…
Apr, 2026
Journal
Electron correlation is a main driver of exotic quantum phases and their interplay. The 4𝐻𝑏−TaS2 system, possessing an intrinsic heterostructure of 1𝑇- and 1𝐻−TaS2 monolayers, offers a unique opportunity to control electron correlation by distorting the atomic lattice or tuning interlayer coupling. Here, we investigated intrinsically deformed charge-density waves (CD…
Sep, 2025
Journal
The Kitaev model has served as a long-sought-after target in the realization of a quantum spin liquid that could host Majorana Fermions. Such non-Abelian anyons could revolutionize quantum computing if properly implemented to overcome decoherence. A 3d7 electronic configuration, like Co2+, has been explored by theory and experimental work to design Kitaev materials. Here,…
Aug, 2025
Journal
Charge density waves (CDWs) in transition metal dichalcogenides are the subject of growing scientific interest due to their rich interplay with exotic phases of matter and their potential technological applications. Here, using density functional theory with advanced meta-generalized gradient approximations (meta-GGAs) and linear response time-dependent density functional…
Aug, 2025
Journal
Two-dimensional (2D) 1T-VSe2 has prompted significant interest due to the discrepancies regarding alleged ferromagnetism (FM) at room temperature, charge density wave (CDW) states, and the interplay between the two. We employed a combined Diffusion Monte Carlo (DMC) and density functional theory (DFT) approach to accurately investigate the magnetic properties, CDW states,…
Aug, 2025
Journal
Spin-flip dark excitons are optical-dipole-forbidden quasiparticles with remarkable potential in optoelectronics, especially when they are realized within cleavable van der Waals materials. Despite this potential, dark excitons have not yet been definitively identified in ferromagnetic van der Waals materials. Here, we report two dark excitons in a model ferromagnetic mate…
May, 2025
Journal
By expanding the gauge 𝜆𝑛(𝐤) for magnon band 𝑛 in harmonics of momentum 𝐤=(𝑘,𝜙), we demonstrate that the only observable component of the magnon orbital angular momentum 𝑂𝑛(𝐤) is its angular average over all angles 𝜙, denoted by 𝐹𝑛(𝑘). Although 𝐹𝑛(𝑘) vanishes for antiferromagnetic honeycomb and zigzag (0
Apr, 2025
Journal
We investigate and compare the electronic structure of OsO2 with the extensively studied RuO2. Calculations show that OsO2 exhibits antiferromagnetism and spin splitting driven by crystal symmetry, a characteristic of altermagnetism and similar to RuO2. Examination of the Fermi surface, with and without spin-orbit coupling, reveals that OsO2 has lower Fermi group velocitie…
Apr, 2025
Journal
Two-dimensional (2D) 1T-VSe2 has prompted significant interest due to the discrepancies regarding alleged ferromagnetism (FM) at room temperature, charge density wave (CDW) states, and the interplay between the two. We employed a combined Diffusion Monte Carlo (DMC) and density functional theory (DFT) approach to accurately investigate the magnetic properties, CDW states,…
Sep, 2024
Journal
Dopant impurity potentials determined by ab initio supercell density functional theory calculations are used to calculate the optical conductivity of overdoped La2−𝑥Sr𝑥CuO4 (LSCO) and Tl2Ba2CuO6+𝛿 (Tl-2201) in the superconducting and normal states. Vertex corrections are included to account for the effect of forward scattering on two-particle properties. This approach…