Fermi Arcs and Their Topological Character in the Candidate Type-II Weyl Semimetal<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>MoTe</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Tamai, Anna; Wu, Quansheng; Cucchi, Irène; Bruno, F. Y.; Riccó, Sara; Kim, T. K.; Hoesch, Moritz; Barreteau, Céline; Giannini, E.; Besnard, Céline; Soluyanov, Alexey A.; Baumberger, F.

doi:10.1103/physrevx.6.031021

Cited by 240 publications

(293 citation statements)

References 49 publications

(127 reference statements)

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“…While transition metal dichalcogenides materials, MoTe 2 and WTe 2 , were found to show superconductivity under high pressure and both of them were considered to be the type-II Weyl semimetal. 19,[23][24][25][26][27][28][29][30][31][32][33][34][35] In this paper, we report, for the first time, the discovery of bulk superconductivity accompanied by a structure phase transition in Weyl semimetal TaP by applying high pressure. More importantly, first-principles calculations confirm that the P-6m2 phase with superconductivity induced by high pressure has the Weyl semimetal feature, but is distinct from the ambient phase.…”

Section: Introductionmentioning

confidence: 88%

Concurrence of superconductivity and structure transition in Weyl semimetal TaP under pressure

Zhou

Guo

et al. 2017

npj Quant Mater

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Weyl semimetal defines a material with three-dimensional Dirac cones, which appear in pair due to the breaking of spatial inversion or time reversal symmetry. Superconductivity is the state of quantum condensation of paired electrons. Turning a Weyl semimetal into superconducting state is very important in having some unprecedented discoveries. In this work, by doing resistive measurements on a recently recognized Weyl semimetal TaP under pressures up to about 100 GPa, we show the concurrence of superconductivity and a structure transition at about 70 GPa. It is found that the superconductivity becomes more pronounced when decreasing pressure and retains when the pressure is completely released. High-pressure x-ray diffraction measurements also confirm the structure phase transition from I4 1 md to P-6m2 at about 70 GPa. More importantly, ab-initial calculations reveal that the P-6m2 phase is a new Weyl semimetal phase and has only one set of Weyl points at the same energy level. Our discovery of superconductivity in TaP by high pressure will stimulate investigations on superconductivity and Majorana fermions in Weyl semimetals.

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Section: Introductionmentioning

confidence: 88%

Concurrence of superconductivity and structure transition in Weyl semimetal TaP under pressure

Zhou

Guo

et al. 2017

npj Quant Mater

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“…1(a). This low temperature state exhibits a number of interesting properties, such as extremely large magnetoresistance [5,13,14], superconductivity with possible unconventional origins [15][16][17], and type-II Weyl nodes [18][19][20][21][22][23][24], the last of which requires broken inversion symmetry established only within the phase.…”

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confidence: 99%

Dimensionality-driven orthorhombic MoTe2 at room temperature

Zhong

Kim

et al. 2018

Phys. Rev. B

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Abstract:We use a combination of Raman spectroscopy and transport measurements to study thin flakes of the type-II Weyl semimetal candidate MoTe2 protected from oxidation. In contrast to bulk crystals, which undergo a phase transition from monoclinic to the inversion symmetry breaking, orthorhombic phase below ~250 K, we find that in moderately thin samples below ~12 nm, a single orthorhombic phase exists up to and beyond room temperature. This could be due to the effect of c-axis confinement, which lowers the energy of an out-of-plane hole band and stabilizes the orthorhombic structure. Our results suggest that Weyl nodes, predicated upon inversion symmetry breaking, may be observed in thin MoTe2 at room temperature. Main text:

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“…1(d [20][21][22][23][24][25][26][27]; (ii) The Weyl points are expected to appear at energies above the Fermi level [15][16][17][18], where they are inaccessible to conventional photoemission techniques [20][21][22][23][24][25][26][27]. In this context, while a general consensus exists over the topological nature of the MoTe 2 arcs [20][21][22], the situation appears highly controversial for WTe 2 . Although surface arcs have clearly been observed in several photoemission studies, their topological or trivial nature is highly debated with different studies reaching conflicting conclusions [23][24][25][26].…”

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confidence: 99%