Research progress on topological nodal line semimetals

Zhang, Zeying; Fu, Botao; Yu, Zhi‐Ming; Yao, Yugui

doi:10.1360/sspma-2020-0149

Cited by 4 publications

(3 citation statements)

References 78 publications

(90 reference statements)

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“…Although several topological semimetals with 1D nodal line states [29][30][31][32][33][34][35][36][37][38][39][40][41][42][43] have been predicted, only a few have been experimentally verified. This is primarily because the electronic structures of the expected materials are far from ideal.…”

Section: Nodal Line Sgss (Nlsgss)mentioning

confidence: 99%

Investigation of nodal line spin-gapless semiconductors using first-principles calculations

et al. 2022

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Section: Nodal Line Sgss (Nlsgss)mentioning

confidence: 99%

Investigation of nodal line spin-gapless semiconductors using first-principles calculations

et al. 2022

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“…[1] The bands can also cross along a curve, described as Dirac and Weyl nodal-line semimetals (DNLSs and WNLSs). [2][3][4] In general, DNLSs can be categorized into type-I and type-II, [5,6] according to the band dispersion slope around the band crossing. In type-II semimetals, the asymmetric valence and conduction bands induced by the tilted linear dispersion lead to the coexistence of electron and hole pockets on the Fermi surface, and thus exhibit large unsaturated magnetoresistance (MR), as found in WTe 2 [7] and Mg 3 Bi 2 .…”

Section: Introductionmentioning

confidence: 99%

Type‐II Dirac Nodal Lines in a Double‐Kagome‐Layered Semimetal

Cai

Wang

et al. 2023

Adv Elect Materials

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Lorentz‐violating type‐II Dirac nodal line semimetals (DNLSs), hosting curves of band degeneracy formed by two dispersion branches with the same sign of slope, represent a novel state of matter. While being studied extensively in theory, convincing experimental evidence of type‐II DNLSs remain elusive. Recently, vanadium‐based kagome materials have emerged as a fertile ground to study the interplay between lattice symmetry and band topology. This work studies the low‐energy band structure of double‐kagome‐layered CsV8Sb12 and identifies it as a scarce type‐II DNLS protected by mirror symmetry. This work observes multiple DNLs consisting of type‐II Dirac cones close to or almost at the Fermi level via angle‐resolved photoemission spectroscopy (ARPES), which provides an electronic explanation for the nonsaturating magnetoresistance effect as observed. First‐principles theory analyses show that spin‐orbit coupling only opens a small gap, resulting in effectively gapless ARPES spectra, yet generating large spin Berry curvature. These type‐II DNLs, together with the interaction between a low‐energy van Hove singularity and quasi‐one‐dimensional band as observed in the same material, suggest CsV8Sb12 as an ideal platform for exploring novel transport properties.

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“…The nontrivial drumhead special surface states of TNLSMs will form a large density of energy states near the surface state [26][27][28], which is very beneficial for quantum transport. The most direct way to observe TNLSMs experimentally is to measure the electronic structure (or nontrivial drumhead special surface states) of the system by angle-resolved photoemission spectroscopy or other experimental methods [32]. At present, the structure of nodal-line semimetals has been confirmed in Cu 2 Si [33], PbTaSe 2 [34], CaAg [35], PtSn 4 [36], ZrSiX(X = S, Se, Te) [37,38], XB 2 (X = Ti, Zr) [39,40] and other materials.…”

Section: Introductionmentioning

confidence: 99%

Nernst effect in anisotropic four-terminal topological nodal-line semimetals

Cheng,

Yang,

Wang

et al. 2023

J. Phys.: Condens. Matter

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The Nernst eﬀect is the transverse mode of thermoelectric transport, in which a longitudinal thermal gradient induces a transverse current in the conductor while under a perpendicular magnetic ﬁeld. Here the Nernst eﬀect in a mesoscopic topological nodal-line semimetals (TNLSMs) system of four-terminal cross-bar with the spin-orbit coupling under a perpendicular magnetic ﬁeld is studied. The Nernst coeﬃcient Ncin two non-equivalen connection modes (kz-y mode and kx-y mode) is calculated based on the tight-binding Hamiltonian combined with the nonequilibrium Green’s function method. When the magnetic ﬁeld is absent with ϕ = 0.0, the Nernst coeﬃcient Nc = 0 exactly regardless of the temperature. When the magnetic ﬁeld is not zero, the Nernst coeﬃcient exhibits a series of densely oscillating peaks. The height of peak strongly depends on the magnetic ﬁeld, and the Nernst coeﬃcient is an even function of the Fermi energy EFsatisfying the symmetrical property Nc(−EF ) = Nc(EF ). The Nernst coeﬃcient is also closely related to the temperature T . When the temperature is very low (or T → 0), the Nernst coeﬃcient depends linearly on temperature. In the presence of a strong magnetic ﬁeld, the Nernst coeﬃcient shows peaks when the Fermi energy crosses the Landau levels. Under the weak magnetic ﬁeld, the inﬂuence of spin-orbit coupling in TNLSMs materials on Nernst eﬀect is very obvious. In the presence of the mass term, the PT-symmetry of the system is destroyed, the nodal ring of TNLSMs is broken and an energy gap will be opened. The Nernst coeﬃcient Nc has a large value in the energy gap, which is very promising for the application of the transverse thermoelectric transport.

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Research progress on topological nodal line semimetals

Cited by 4 publications

References 78 publications

Investigation of nodal line spin-gapless semiconductors using first-principles calculations

Investigation of nodal line spin-gapless semiconductors using first-principles calculations

Type‐II Dirac Nodal Lines in a Double‐Kagome‐Layered Semimetal

Nernst effect in anisotropic four-terminal topological nodal-line semimetals

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