Disentangling orbital and spin textures of surface-derived states in non-symmorphic semimetal HfSiS

Wang, Xiaoxiao; Chen, Jiahua; Zheng, Mingxia; Menshchikova, Tatiana V.; Rusinov, Igor P.; Schwier, Eike F.; Orbanić, Filip; Wu, Shugang; Sumida, Kazuki; Yoshikawa, Tomohiro; Miyamoto, Koji; Nurmamat, Munisa; Okuda, Takashi; Shimada, Kenya; Novak, Mario; Chulkov, Evgueni V.; Kimura, Akio

doi:10.1103/physrevb.100.205140

Cited by 5 publications

(1 citation statement)

References 44 publications

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“…23 This finding is in line with the previous considerations that crystal structures with square nets and the P4/nmm nonsymmorphic space-group lattice symmetry support symmetry-protected band crossings at the high-symmetry points, i.e., along a 1D line in the BZ or on a 2D surface in the 3D BZ, thus, forming multiple interconnected nodal lines and nodal surfaces. 18,19,55,56 In the nonmagnetic analogue, ZrSiS, 4-folddegenerate nodes exist at X, R, M, and A points and nodal surfaces run along the high-symmetry A−M and R−X directions of the 3D BZ. Nodal surfaces are protected by the nonsymmorphic symmetry of the space group so that magnetic exchange interactions and the resultant symmetry of the AFM-I state lift up these degeneracies in GdBiTe (Figure 11, upper right).…”

Section: Gdbitementioning

confidence: 99%

Heavy-Atom Antiferromagnet GdBiTe: An Interplay of Magnetism and Topology in a Symmetry-Protected Topological Semimetal

et al. 2021

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Magnetic topological semimetals (MTSs) are quantum materials highly desirable for spintronics. We report the synthesis, the crystal structure, the chemical bonding analysis, the magneto(transport) properties, and the bulk and surface electronic structures of GdBiTe. It is a high-Z isostructural analogue of the archetypical nodal-line TS ZrSiS and a recently discovered MTS LnSbTe (Ln = Ce, Gd). GdBiTe crystallizes in the nonsymmorphic space group P4/nmm (No. 129) with a = 4.3706(2) Å and c = 9.2475(7) Å. Chemical bonding analysis describes it as a layered structure of alternating weakly bonded double-stacked covalent [GdTe] layers and planar square [Bi] nets. GdBiTe exhibits an antiferromagnetic transition at T N = 15 K, and an additional transition, possibly a spin reorientation into a canted antiferromagnetic state, occurs below ca. 5 K. The electrical resistivity is compatible with a semimetallic behavior above T N. The Hall coefficient is negative, reflecting an electron-like character of the transport in a semimetal. The magnetoresistance presents a negative contribution at temperatures lower than ca. 30 K, consistent with the freezing of spin fluctuations due to the applied field. First-principles calculations identify a collinear antiferromagnetic ground state with the Gd(III) magnetic moments coupled ferromagnetically in-plane (easy axis along [100]) and antiferromagnetically along the c axis. This spin alignment differs from the reported LnSbTe and enables new scenarios of symmetry breaking due to magnetic order and spin–orbit coupling in a symmetry-protected topological semimetal. GdBiTe hosts exotic topological features resulting from an interplay of lattice symmetry, magnetism, and topology. Its collinear antiferromagnetic phase exhibits fingerprints of the nodal lines in the bulk electronic spectrum confined to k z = π/c planes and a surface state with a symmetry-protected crossing at the (010) face, whereas the paramagnetic phase is a weak topological insulator and a higher-order topological insulator with topologically protected surface states at the (100), (010), and (001) planes. GdBiTe is also better suited for topological transport properties than LnSbTe thanks to a gapped trivial electron pocket at the Γ point. The isostructural LaBiTe was synthesized as a single-phase powder (sp. gr. P4/nmm; a = 4.48819(9) Å, and c = 9.5501(3) Å). Its bulk and surface electronic spectra are similar to the nonmagnetic case of GdBiTe.

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Section: Gdbitementioning

confidence: 99%

Heavy-Atom Antiferromagnet GdBiTe: An Interplay of Magnetism and Topology in a Symmetry-Protected Topological Semimetal

et al. 2021

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Observation of Spin Splitting in Room‐Temperature Metallic Antiferromagnet CrSb

Zeng,

Zhu,

Zhu

et al. 2024

Advanced Science

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Recently, unconventional antiferromagnets that enable the spin splitting (SS) of electronic states have been theoretically proposed and experimentally realized, where the magnetic sublattices containing moments pointing at different directions are connected by a novel set of symmetries. Such SS is substantial, k‐dependent, and independent of the spin–orbit coupling (SOC) strength, making these magnets promising materials for antiferromagnetic spintronics. Here, combined with angle‐resolved photoemission spectroscopy (ARPES) and density functional theory (DFT) calculations, a systematic study on CrSb, a metallic spin‐split antiferromagnet candidate with Néel temperature TN = 703 K, is conducted. The data reveal the electronic structure of CrSb along both out‐of‐plane and in‐plane momentum directions, rendering an anisotropic k‐dependent SS that agrees well with the calculational results. The magnitude of such SS reaches up to at least 0.8 eV at non‐high‐symmetry momentum points, which is significantly higher than the largest known SOC‐induced SS. This compound expands the choice of materials in the field of antiferromagnetic spintronics and is likely to stimulate subsequent investigations of high‐efficiency spintronic devices that are functional at room temperature.

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Hidden bulk and surface effects in the spin polarization of the nodal-line semimetal ZrSiTe

et al. 2021

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In non-magnetic materials the combination of inversion symmetry breaking (ISB) and spin-orbit coupling (SOC) determines the spin polarization of the band structure. However, a local spin polarization can also arise in centrosymmetric crystals containing ISB subunits. This is namely the case for the nodal-line semimetal ZrSiTe where, by combining spin- and angle-resolved photoelectron spectroscopy with ab initio band structure calculations, we reveal a complex spin polarization. In the bulk, the valence and conduction bands exhibit opposite spin orientations in two spatially separated two-dimensional ZrTe sectors within the unit cell, yielding no net polarization. We also observe spin-polarized surface states that are well separated in energy and momentum from the bulk bands. A layer-by-layer analysis of the spin polarization allows us to unveil the complex evolution of the signal in the bulk states near the surface, thus bringing the intertwined nature of surface and bulk effects to the fore.

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Disentangling orbital and spin textures of surface-derived states in non-symmorphic semimetal HfSiS

Cited by 5 publications

References 44 publications

Heavy-Atom Antiferromagnet GdBiTe: An Interplay of Magnetism and Topology in a Symmetry-Protected Topological Semimetal

Heavy-Atom Antiferromagnet GdBiTe: An Interplay of Magnetism and Topology in a Symmetry-Protected Topological Semimetal

Observation of Spin Splitting in Room‐Temperature Metallic Antiferromagnet CrSb

Hidden bulk and surface effects in the spin polarization of the nodal-line semimetal ZrSiTe

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