The interplay of topology, magnetism, and correlations gives rise to intriguing phases of matter. In this study, through state-of-the-art angle-resolved photoemission spectroscopy, density functional theory, and dynamical mean-field theory calculations, we visualize a fourfold degenerate Dirac nodal line at the boundary of the bulk Brillouin zone in the antiferromagnet YMnGe. We further demonstrate that this gapless, antiferromagnetic Dirac nodal line is enforced by the combination of magnetism, space-time inversion symmetry, and nonsymmorphic lattice symmetry. The corresponding drumhead surface states traverse the whole surface Brillouin zone. YMnGe thus serves as a platform to exhibit the interplay of multiple degenerate nodal physics and antiferromagnetism. Interestingly, the magnetic nodal line displays a d-orbital dependent renormalization along its trajectory in momentum space, thereby manifesting Hund's coupling. Our findings offer insights into the effect of electronic correlations on magnetic Dirac nodal lines, leading to an antiferromagnetic Hund nodal line.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11327286 | PMC |
| http://dx.doi.org/10.1038/s41467-024-51255-3 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Multipocket synergy towards high thermoelectric performance in topological semimetal TaAs.
Nat Commun
January 2025
Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, Dresden, Germany.
Charge-carrier compensation in topological semimetals amplifies the Nernst signal and simultaneously degrades the Seebeck coefficient. In this study, we report the simultaneous achievement of both a large Nernst signal and an unsaturating magneto-Seebeck coefficient in a topological nodal-line semimetal TaAs single crystal. The unique dual-high transverse and longitudinal thermopowers are attributed to multipocket synergy effects: the combination of a strong phonon-drag effect and the two overlapping highly dispersive conduction and valence bands with electron-hole compensation and high mobility, promising a large Nernst effect; the third Dirac band causes a large magneto-Seebeck effect.
View Article and Find Full Text PDFHeterostructure growth, electrical transport and electronic structure of crystalline Dirac nodal arc semimetal PtSn.
Sci Rep
December 2024
Department of Physics, University of Liverpool, Oxford Street, Liverpool, L69 7ZE, UK.
Topological semimetals have recently garnered widespread interest in the quantum materials research community due to their symmetry-protected surface states with dissipationless transport which have potential applications in next-generation low-power electronic devices. One such material, [Formula: see text], exhibits Dirac nodal arcs and although the topological properties of single crystals have been investigated, there have been no reports in crystalline thin film geometry. We examined the growth of [Formula: see text] heterostructures on a range of single crystals by optimizing the electron beam evaporation of Pt and Sn and studied the effect of vacuum thermal annealing on phase and crystallinity.
View Article and Find Full Text PDFCorrelated topological flat bands in rhombohedral graphite.
Proc Natl Acad Sci U S A
October 2024
State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing 100084, People's Republic of China.
Flat bands and nontrivial topological physics are two important topics of condensed matter physics. With a unique stacking configuration analogous to the Su-Schrieffer-Heeger model, rhombohedral graphite (RG) is a potential candidate for realizing both flat bands and nontrivial topological physics. Here, we report experimental evidence of topological flat bands (TFBs) on the surface of bulk RG, which are topologically protected by bulk helical Dirac nodal lines via the bulk-boundary correspondence.
View Article and Find Full Text PDFQuantum Geometry Induced Nonlinear Transport in Altermagnets.
Phys Rev Lett
September 2024
Department of Physics and Astronomy, Stony Brook University, Stony Brook, New York 11794, USA.
Article Synopsis
- * The study differentiates contributions to this response, highlighting that longitudinal responses mainly arise from quantum metric quadrupole (QMQ), while transverse responses involve both QMQ and Berry curvature quadrupole (BCQ), with the Hall response for d-wave altermagnets being primarily influenced by BCQ.
- * Additionally, the results indicate that crystalline anisotropy and spin-orbit coupling (SOC) significantly affect the response, with SOC leading to sharper peaks in the response and changes
Real Topological Phonons in 3D Carbon Allotropes.
Adv Mater
November 2024
Key Lab of Advanced Optoelectronic Quantum Architecture and Measurement (MOE), Beijing Key Lab of Nanophotonics & Ultrafine Optoelectronic Systems, and School of Physics, Beijing Institute of Technology, Beijing, 100081, China.
Article Synopsis
- Researchers are focusing on real topological systems with space-time inversion symmetry and no spin-orbit coupling, emphasizing the need for more materials that can demonstrate these properties in 3D.
- High-throughput computing was used to analyze 3D carbon allotropes, leading to the identification of 79 candidates for phononic real Chern insulating states, among others.
- The study provides insights into various phononic states in selected carbon structures and explores second-order phononic hinge modes, thus expanding the knowledge and potential applications of 3D topological phonons.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!