Extremely high conductivity observed in the triple point topological metal MoP

Kumar, Nitesh; Sun, Yan; Nicklas, M.; Watzman, Sarah J.; Young, Olga; Leermakers, Inge; Hornung, J.; Klotz, Johannes; Gooth, Johannes; Manna, Kaustuv; Süß, Vicky; Guin, Satya N.; Förster, Tobias; Schmidt, Marcus; Muechler, Lukas; Yan, Binghai; Werner, P.; Schnelle, Walter; Zeitler, U.; Wosnitza, J.; Parkin, Stuart S. P.; Felser, Claudia; Shekhar, Chandra

doi:10.1038/s41467-019-10126-y

Cited by 68 publications

(46 citation statements)

References 44 publications

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“…As a member of TMPs family, molybdenum phosphide (MoP) exhibits many exotic properties with the presence of novel three-component fermions, such as intrinsic non-centrosymmetric structure, high conductivity, strong anisotropic lattice thermal conductivity, superconductivity, and the transformation to a direct bandgap semiconductor in monolayer MoP [7][8][9][10][11]. Yet, traditional solution approaches usually obtain polycrystalline nanoparticles [12,13].…”

Section: Introductionmentioning

confidence: 99%

Growth of 2D MoP single crystals on liquid metals by chemical vapor deposition

et al. 2020

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Section: Introductionmentioning

confidence: 99%

Growth of 2D MoP single crystals on liquid metals by chemical vapor deposition

et al. 2020

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“…gapless Landau levels in presence of symmetry preserving magnetic fields, suggesting the possibility of observing transport anomalies. Extremely high mobility and conductivity have been observed in these materials 53 , and a doping-driven Lifshitz transition is also predicted in these class of materials 54 .…”

Section: Introductionmentioning

confidence: 88%

Strain-induced topological charge control in multifold fermion systems

Bose,

Narayan

2021

Preprint

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Multifold fermion systems feature free fermionic excitations, which have no counterparts in highenergy physics, and exhibit several unconventional properties. Using first-principles calculations, we predict that strain engineering can be used to control the distribution of topological charges in transition metal silicide candidate CoSi, hosting multifold fermions. We demonstrate that breaking the rotational symmetry of the system, by choosing a suitable strain, destroys the multifold fermions, and at the same time results in the creation of Weyl points. We introduce a low energy effective model to complement the results obtained from density functional calculations. Our findings suggest that strain-engineering is a useful approach to tune topological properties of multifold fermions.

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“…[181] The structure of MoP is shown to have a complex Fermi surface (FS) due to the existence of the triply degenerate points protected by mirror and rotation symmetry, [182] which is coupled with the short distance between Mo-P causing the orbitals to hybridize with each other to form complex electronic structures with large bandwidths. The compound was found to have a characteristically low electrical resistivity of 6 nΩ in low temperature, which is attributed to the open FS, resulting in more than two times lower than copper of a similar purity, [183] thus rendering it a good candidate as a polysulfide redox catalyst. In view of that, Mi et al employed MoP nanoparticles anchored on carbon nanotubes, forming CNT-MoP/GO-S as the cathode material.…”

Section: Metal Phosphidementioning

confidence: 99%

Lithium–Sulfur Battery Cathode Design: Tailoring Metal‐Based Nanostructures for Robust Polysulfide Adsorption and Catalytic Conversion

2021

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portable electronic devices such as laptops and mobile phones. However, with the increasing demand for clean energy and portable electronics, the energy densities powered by the LIB (≈300 mAh g −1 ) are beginning to reach the threshold limit and thus, leading to a need for an alternate environmentally friendly and more economical energy storage technology with higher energy densities. [1] One of the most promising candidates for the LIB replacement is the lithium-sulfur (Li-S) battery, which utilizes the redox reaction between sulfur and lithium. Compared to LIB and other metal-sulfur batteries (Figure 1a), Li-S batteries are profiled as a viable energy storage technology stemming from their high specific energy capacity of 1675 mAh g −1 and superior energy density of around 2670 Wh kg −1 . [1a-d,2] The elemental sulfur, which is used as the cathode material, also has a multitude of auspicious properties such as its inexpensiveness, environmentally friendliness, abundancy and non-toxicity. [2d,3] In addition, another emerging battery system is the metal-air battery, which is a half-open system that utilize oxygen from ambient air as the active cathode material. Thus, Li-S batteries are comparatively safer due to their enclosed system. Apart from that, the influence of CO 2 , H 2 O, and N 2 in ambient air can lead to chemical instability in metal-air batteries. [4] Taking Li-air batteries as an example, the presence of CO 2 leads to the formation of Li 2 CO 3 , which is more chemically stable than Li 2 O 2 and causes a larger charge overpotential, hence leading to decomposition issues of electrolytes. [5] Nevertheless, progress for the real-world usage of Li-S batteries is currently hindered by multiple drawbacks. First, despite its manifold advantages, sulfur and its discharge products (Li 2 S or Li 2 S 2 ) are inherently insulating with low conductivities of 10 −7 to 10 −30 S cm −1 at room temperature, rendering it unbefitting to be directly used as the cathode. [6] Second, the inevitable volume expansion of the electrode (≈80%) due to the contrasting densities of S 8 and Li 2 S causes structural damage during the charge/discharge cycle. [7] Third, the "polysulfide shuttle effect" would occur, whereby the soluble higher order polysulfides (Li 2 S 4 to Li 2 S 8 ) dissolve in the electrolyte and migrate between the anode and the cathode, leading to its Lithium-sulfur (Li-S) batteries have a high specific energy capacity and density of 1675 mAh g −1 and 2670 Wh kg −1 , respectively, rendering them among the most promising successors for lithium-ion batteries. However, there are myriads of obstacles in the practical application and commercialization of Li-S batteries, including the low conductivity of sulfur and its discharge products (Li 2 S/Li 2 S 2 ), volume expansion of sulfur electrode, and the polysulfide shuttle effect. Hence, immense attention has been devoted to rectifying these issues, of which the application of metal-based compounds (i.e., transition metal, metal phosphides, sulfides, oxides, carbides...

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Extremely high conductivity observed in the triple point topological metal MoP

Cited by 68 publications

References 44 publications

Growth of 2D MoP single crystals on liquid metals by chemical vapor deposition

Growth of 2D MoP single crystals on liquid metals by chemical vapor deposition

Strain-induced topological charge control in multifold fermion systems

Lithium–Sulfur Battery Cathode Design: Tailoring Metal‐Based Nanostructures for Robust Polysulfide Adsorption and Catalytic Conversion

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