Observation of bulk nodal lines in topological semimetal ZrSiS

Bao, Futing; Yi, Changjiang; Zhang, Tiantian; Caputo, Marco; Ma, Junzhang; Gao, Xin; Lyu, Baiqing; Kong, Ling-Yuan; Huang, Yaobo; Shi, M.; Strocov, V. N.; Fang, Chen; Weng, Hongming; Shi, Youguo; Qian, Tian; Ding, Hong

doi:10.48550/arxiv.1712.00782

Cited by 4 publications

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“…ZrSiSe and ZrSiTe have also been shown to possess nodal Fermi arcs, which have been observed the bulk of ZrSiS [33,34]. The topological phases in the ZrSiX family of materials show a transition from nodal-line to nodeless gapped phase by tuning the chalcogenide from S to Te [35].…”

Section: Discussionmentioning

confidence: 82%

Possible pressure-induced topological quantum phase transition in the nodal line semimetal ZrSiS

et al. 2019

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ZrSiS has recently gained attention due to its unusual electronic properties: nearly perfect electron-hole compensation, large, anisotropic magneto-resistance, multiple Dirac nodes near the Fermi level, and an extremely large range of linear dispersion of up to ∼ 2 eV. We have carried out a series of high pressure electrical resistivity measurements on single crystals of ZrSiS. Shubnikov-de Haas measurements show two distinct oscillation frequencies. For the smaller orbit, we observe a change in the phase of ∼0.5, which occurs between 0.16 − 0.5 GPa. This change in phase is accompanied by an abrupt decrease of the cross-sectional area of this Fermi surface. We attribute this change in phase to a possible topological quantum phase transition. The phase of the larger orbit exhibits a Berry phase of π and remains roughly constant up to ∼2.3 GPa. Resistivity measurements to higher pressures show no evidence for pressure-induced superconductivity to at least ∼ 20 GPa.

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Section: Discussionmentioning

confidence: 82%

Possible pressure-induced topological quantum phase transition in the nodal line semimetal ZrSiS

et al. 2019

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“…In the three-dimensional Brillouin zone, the FS topology is that of a tube. The experimental FS [11] seems to be closer to a branching network of nodal lines with linearly vanishing density of states, widened into thinner Fermi tubes by additional energy shifts. Qualitatively, although a model beyond the leading terms in (1) contains other terms with partially cancelling effects, such a network can be obtained by adding a wavevector-dependent offdiagonal t AB (k) term.…”

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confidence: 81%

“…In ZrSiS, one has closed crossing lines in planes with fixed momemtum k z = 0 or π for the direction orthogonal to the layers and also along other highsymmetry lines perpendicular to the k x /k y -plane [8], resulting in a cage-like network of band crossing lines close to the Fermi level. Recent band-structure [10] and photoemission [11] works have shown that these band crossings are responsible for the only Fermi surfaces (FS) of the system, which form tubes of varying thickness around the cage-like network of the band crossing lines. In the twodimensional limit, the FS can be idealized to a tube-like nodal surface formed by two linearly dispersing bands, with diamond-shaped nodal line upon projection into the planes with fixed k z .…”

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confidence: 99%

Excitonic instability and unconventional pairing in the nodal-line materials ZrSiS and ZrSiSe

et al. 2018

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We use a functional renormalization group (fRG) approach to investigate potential interactioninduced instabilities in a two-dimensional model for the Dirac nodal-line materials ZrSiS and ZrSiSe employing model parameters derived from ab initio calculations. Our results confirm that the excitonic instability recently found in random-phase approximation for ZrSiS is indeed the leading instability. In the simplest modeling, spin-and charge-excitonic states are degenerate. Beyond this, we show that the fRG analysis produces an energy scale for the onset of the instability in good agreement with the experimentally observed mass enhancement. Additionally, by exploring the parameter space of the model we find that reducing the band splitting increases the instability scale and gives the chance to drive the system into an unconventional superconducting pairing state. The model parameters for the case of the structurally similar material ZrSiSe suggest the d-wave superconducting state as the leading instability with a very small critical scale.

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“…However, very few materials are predicted to host nodal lines protected by the crystal symmetry 36,37 , which are robust against SOC. What's worse, most nodal lines are far away from the Fermi level and not formed by band touching of the highest valence band and the lowest conduction band 38,39 . To the best of our knowledge, the signature of the existence of drumhead surface states is only observed in nonmagnetic PbTaSe 2 37 , in which the existence of trivial Fermi pockets and some accidental nodal lines results in very complicated spectroscopic and transport properties.…”

Section: Introductionmentioning

confidence: 98%

Topological nodal-line semimetals in ferromagnetic rare-earth-metal monohalides

2019

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Topological semimetals, extending the topological classification from insulators to metals, have greatly enriched our understanding of topological states in condensed matter. This is particularly true for topological nodal-line semimetals (TNLSs). In the present paper, we identify layered materials as promising candidates for hosting TNLSs. Based on first-principles calculations and effective model analysis, we propose that layered ferromagnetic rare-earth-metal monohalides LnX (Ln=La, Gd; X=Cl, Br) exhibit long pursued topological phases. Specifically, single-layer LaX and singlelayer GdX are ideal two-dimensional (2D) Weyl semimetals and large-gap 2D quantum anomalous Hall insulators (QAHIs), with band gaps up to 61 meV, respectively. In addition, 3D LaX and 3D GdX are TNLSs with a pair of mirror-symmetry protected nodal lines and 3D QAHIs, respectively. The nodal lines in 3D LaX extending through the whole Brillouin zone (BZ) are fairly robust against strong spin-orbit coupling (SOC) and located close to the Fermi level, providing a novel platform toward exploring the exotic properties in nodal-line fermions as well as related device designs. arXiv:1803.08486v2 [cond-mat.mtrl-sci]

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Observation of bulk nodal lines in topological semimetal ZrSiS

Cited by 4 publications

References 0 publications

Possible pressure-induced topological quantum phase transition in the nodal line semimetal ZrSiS

Possible pressure-induced topological quantum phase transition in the nodal line semimetal ZrSiS

Excitonic instability and unconventional pairing in the nodal-line materials ZrSiS and ZrSiSe

Topological nodal-line semimetals in ferromagnetic rare-earth-metal monohalides

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