Topological phases in the 
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 compound

Nie, Simin; Xing, Lingyi; Jin, Rongying; Xie, Weiwei; Wang, Zhijun; Prinz, Fritz B.

doi:10.1103/physrevb.98.125143

Cited by 61 publications

(61 citation statements)

References 48 publications

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“…Topological materials that host superconductivity are ideal systems to detect topological superconductivity (TSC) and Majorana fermions [33][34][35][36][37][38][39] . The topological surface Dirac-cone states can be used to generate two-dimensional (2D) TSC induced by the intrinsic bulk superconductivity [40][41][42][43] .…”

Section: Introductionmentioning

confidence: 99%

Topological electronic states in HfRuP family superconductors

Qian¹,

Nie²,

Yi³

et al. 2019

npj Comput Mater

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Based on the first-principles calculations and experimental measurements, we report that the hexagonal phase of ternary transition metal pnictides TT'X (T=Zr, Hf; T'=Ru; X=P, As), which are well-known noncentrosymmetric superconductors with relatively high transition temperatures, host nontrivial bulk topology. Before the superconducting phase transition, we find that HfRuP belongs to a Weyl semimetal phase with 12 pairs of type-II Weyl points, while ZrRuAs, ZrRuP and HfRuAs belong to a topological crystalline insulating phase with trivial Fu-Kane Z 2 indices but nontrivial mirror Chern numbers. High-quality single crystal samples of the noncentrosymmetric superconductors with these two different topological states have been obtained and the superconductivity is verified experimentally. The wide-range band structures of ZrRuAs have been identified by ARPES and reproduced by theoretical calculations. Combined with intrinsic superconductivity, the nontrivial topology of the normal state may generate unconventional superconductivity in both bulk and surfaces. Our findings could largely inspire the experimental searching for possible topological superconductivity in these compounds.

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Section: Introductionmentioning

confidence: 99%

Topological electronic states in HfRuP family superconductors

Qian¹,

Nie²,

Yi³

et al. 2019

npj Comput Mater

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“…The fact that this material revealed extremely high current densities when exfoliated into the bundles of atomic threads was an additional important factor. [ 6 ] Recent interest in TaSe 3 has included studies of its topological phases, [ 17,32–34 ] the effect of strain on its metallic versus semiconducting states, [ 35 ] low temperature charge density wave (CDW) states, [ 18 ] and our own work characterizing its current carrying capacity and low‐frequency electronic noise. [ 36 ] The room temperature, monoclinic crystal structure of TaSe 3 ( Figure a) exhibits aligned chains of trigonal prismatic [TaSe 6 ] units oriented along the b ‐axis.…”

Section: Figurementioning

confidence: 99%

Electrically Insulating Flexible Films with Quasi‐1D van der Waals Fillers as Efficient Electromagnetic Shields in the GHz and Sub‐THz Frequency Bands

et al. 2021

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Polymer composite films containing fillers comprising quasi‐1D van der Waals materials, specifically transition metal trichalcogenides with 1D structural motifs that enable their exfoliation into bundles of atomic threads, are reported. These nanostructures are characterized by extremely large aspect ratios of up to ≈106. The polymer composites with low loadings of quasi‐1D TaSe3 fillers (<3 vol%) reveal excellent electromagnetic interference shielding in the X‐band GHz and extremely high frequency sub‐THz frequency ranges, while remaining DC electrically insulating. The unique electromagnetic shielding characteristics of these films are attributed to effective coupling of the electromagnetic waves to the high‐aspect‐ratio electrically conductive TaSe3 atomic‐thread bundles even when the filler concentration is below the electrical percolation threshold. These novel films are promising for high‐frequency communication technologies, which require electromagnetic shielding films that are flexible, lightweight, corrosion resistant, inexpensive, and electrically insulating.

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“…Thus, both YRuB 2 [34]), which could cause the disappearance of the topological superconducting state. This makes the surface topological superconductivity sensitive to the position of the chemical potential [40]. However, we also investigate the surface states of YRuB 2 on the (100) and (001) surfaces, as shown in the SM Fig.…”

Section: Resultsmentioning

confidence: 99%

RRuB2 (R=Y, Lu) , topological superconductor candidates with hou

et al. 2020

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Topological properties and topological superconductivity in real materials have attracted intensive experimental and theoretical attention recently. Based on symmetry analysis and first-principles electronic structure calculations, we predict that RRuB2 (R=Y, Lu) are not only topological superconductor (TSC) candidates, but also own the hybrid hourglass-type Dirac ring which is protected by the nonsymmorphic space group symmetry. Due to the band inversion around the time-reversal invariant Γ point in the Brillouin zone, RRuB2 also have Dirac topological surface states (TSSs). More importantly, their TSSs on the (010) surface are within the band gap of bulk and cross the Fermi level, which form single Fermi surfaces. Considering the fact that both YRuB2 and LuRuB2 are superconductors with respective superconducting transition temperatures (Tc) of 7.6 K and 10.2 K, the superconducting bulks will likely induce superconductivity in the TSSs via the proximity effect. The ternary borides RRuB2 may thus provide a very promising platform for studying the properties of topological superconductivity and hourglass fermions in the future experiments.

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Topological phases in the TaSe3 compound

Cited by 61 publications

References 48 publications

Topological electronic states in HfRuP family superconductors

Topological electronic states in HfRuP family superconductors

Electrically Insulating Flexible Films with Quasi‐1D van der Waals Fillers as Efficient Electromagnetic Shields in the GHz and Sub‐THz Frequency Bands

RRuB2 (R=Y, Lu) , topological superconductor candidates with hou

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