Nodal-line and triple point fermion induced anomalous Hall effect in the topological Heusler compound 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi mathvariant="normal">Co</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:mi mathvariant="normal">CrGa</mml:mi></mml:math>

Chatterjee, Sudipta; Sau, Jyotirmay; Samanta, Saheli; Ghosh, Barnali; Kumar, Nitesh; Kumar, Manoranjan; Mandal, Kalyan

doi:10.1103/physrevb.107.125138

Cited by 13 publications

(3 citation statements)

References 70 publications

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“…These NLSs have been found or proposed to reveal much more exciting features. These include non-Abelian band topology [76][77][78], distinct collective modes [79,80], correlation effects [81,82], second-order NLSs [83][84][85], and novel transport, the last of which is also exhibiting exotic phenomena such as flat Landau-level spectrum [86], anomalous Hall current [87][88][89][90], parity anomaly [91][92][93], fully spin-polarized transport [94], anomalous Andreev reflection [95], and weak antilocalization [96,97]. However, less attention has been paid on the transport phenomenon directly related to the drumhead surface states of the NLSs, and one may ask a question: Whether do there exist transport properties characterized by these surface modes?…”

Section: Introductionmentioning

confidence: 99%

Quantum transport on the surfaces of topological nodal-line semimetals

Fu,

Guan,

Xie

et al. 2024

New J. Phys.

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Topological nodal-line semimetals are always characterized by the drumhead surface states at the open boundaries. In this paper we first derive an analytical expression for the surface Green’s function of a nodal-line semimetal. By making use of this result, we explore the charge and spin transport properties of a metallic chain on the surface of a nodal line semimetal, as functions of the gate voltage applied on the top of the material. According to the size of the nodal loop, due to the coupling to the surface modes, the charge conductance in the chain is found to show a robust plateau at e2/h, or to exhibit multiple valleys at e2/h. Correspondingly, the spin polarization of the transmitted current is 100% at the plateau region, or exhibits multiple peaks at nearly 100%. This feature can be viewed as a transport signature of the topological nodal-line semimetals.

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Section: Introductionmentioning

confidence: 99%

Quantum transport on the surfaces of topological nodal-line semimetals

Fu,

Guan,

Xie

et al. 2024

New J. Phys.

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“…The family of Heusler compounds is considerably large comprising more than 1000 members and can display paramagnetic, ferromagnetic and antiferromagnetic properties and fascinating anomalous electric, thermal and thermoelectric transport properties [37]. The AHC has been reported to be intrinsic in several Heusler compounds such as Co 2 CrGa, Co 2 VAl,Co 2 FeGe,Co 2 MnGa [8,29,36,38,39]. The major challenge in these compounds is to design Heusler compounds with large anomalous transport properties and their tunability of intrinsic anomalous behavior i.e.…”

Section: Introductionmentioning

confidence: 99%

“…Another challenge is to understand the suitable parameters like applying the pressure and doping of the compound to tune from dominant extrinsic to intrinsic transport properties in Heusler. The intrinsic mechanism is related to BC near the NL and the spin-orbit interaction helps to open a tiny gap near the gapless line [16,39]. The intrinsic mechanism strongly depends on the energy offset of the NL from the Fermi level (E F ) [17,40].…”

Section: Introductionmentioning

confidence: 99%

Hydrostatic pressure-induced anomalous hall effect in Co₂FeSi semimetal

Sau,

Sa,

Kumar

2024

Electron. Struct.

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The Weyl points and nodal line emerge in the momentum space due to symmetry protected state in topological semimetal(TSM) materials and these materials hold significance due to their unusual anomalous transport properties. In this manuscript, we study the topological properties of the electronic band structure of a half-metallic ferromagnet Co$_{2}$FeSi employing the ab-initio DFT method and show that it is a strongly correlated material. The experimentally observed magnetic properties can be explained in terms of the Slater-Pauling (SP) rule and our calculations are consistent with it. We also investigate the band topology of Co$_{2}$FeSi and find that there are three topological nodal lines at 380 meV above Fermi Energy (\textit{E$_F$}). The degeneracy of these nodal lines is perturbed upon introducing spin-orbit coupling with magnetization along [001] direction. However, some points still preserve degeneracy and are identified as Weyl points, each associated with a specific Chern number. At the ambient pressure, the AHC properties of this material have only extrinsic contribution which is consistent with the experimental results. To make the AHC intrinsic, we tune the position of the nodal line close to the Fermi energy by applying the hydrostatic pressure up to 26 GPa. We also discuss crystal symmetries and their relation with nodal lines and Weyl points.

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Probing half-metallicity in Mn2CoSi/Si(100) thin film structures using electrical transport measurements towards spintronic applications

Atul,

Sulania,

Choudhary

et al. 2025

Journal of Physics and Chemistry of Solids

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Nodal-line and triple point fermion induced anomalous Hall effect in the topological Heusler compound Co2CrGa

Cited by 13 publications

References 70 publications

Quantum transport on the surfaces of topological nodal-line semimetals

Quantum transport on the surfaces of topological nodal-line semimetals

Hydrostatic pressure-induced anomalous hall effect in Co₂FeSi semimetal

Probing half-metallicity in Mn2CoSi/Si(100) thin film structures using electrical transport measurements towards spintronic applications

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Nodal-line and triple point fermion induced anomalous Hall effect in the topological Heusler compound Co2CrGa

Cited by 13 publications

References 70 publications

Quantum transport on the surfaces of topological nodal-line semimetals

Quantum transport on the surfaces of topological nodal-line semimetals

Hydrostatic pressure-induced anomalous hall effect in Co2FeSi semimetal

Probing half-metallicity in Mn2CoSi/Si(100) thin film structures using electrical transport measurements towards spintronic applications

Contact Info

Product

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Hydrostatic pressure-induced anomalous hall effect in Co₂FeSi semimetal