Evidence for an edge supercurrent in the Weyl superconductor MoTe
            <sub>2</sub>

Wang, Wudi; Kim, Stephan; Liu, Minhao; Cevallos, F. Alex; Cava, R. J.; Ong, N. P.

doi:10.1126/science.aaw9270

Cited by 92 publications

(85 citation statements)

References 21 publications

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“…Specifically, a CDW can fold four WPs in a rotation-and Tsymmetric WSM into an eightfold double Dirac point (DDP) in which line defects bind helical modes equivalent to HOTI hinge states [125,126]; alternatively, a DDP critical point can also be realized by coupling two fourfold Dirac points with a CDW. Recent experiments have demonstrated hinge-statelike step-edge helical modes and robust edge supercurrents in rotation-and T -symmetric WSMs [127][128][129][130][131], as well as a stable DDP and topological step-edge modes in the CDW phase of TaTe 4 [132]. In the SM, we present an explicit model demonstrating that a T -symmetric Dirac-CDW hosts an eightfold DDP critical point that separates weak TI (WTI) and "obstructed" WTI (oWTI) phases that differ by a helical HOTI.…”

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confidence: 99%

Axionic band topology in inversion-symmetric Weyl-charge-density waves

Wieder

Lin

Bradlyn

2020

Phys. Rev. Research

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In recent theoretical and experimental investigations, researchers have linked the low-energy field theory of a Weyl semimetal gapped with a charge-density wave (CDW) to high-energy theories with axion electrodynamics. However, it remains an open question whether a lattice regularization of the dynamical Weyl-CDW is in fact a single-particle axion insulator (AXI). In this Rapid Communication, we use analytic and numerical methods to study both lattice-commensurate and incommensurate minimal (magnetic) Weyl-CDW phases in the mean-field state. We observe that, as previously predicted from field theory, the two inversion (I)-symmetric Weyl-CDWs with φ = 0, π differ by a topological axion angle δθ φ = π. However, we crucially discover that neither of the minimal Weyl-CDW phases at φ = 0, π is individually an AXI; they are instead quantum anomalous Hall (QAH) and "obstructed" QAH insulators that differ by a fractional translation in the modulated cell, analogous to the two phases of the Su-Schrieffer-Heeger model of polyacetylene. Using symmetry indicators of band topology and non-Abelian Berry phase, we demonstrate that our results generalize to multiband systems with only two Weyl fermions, establishing that minimal Weyl-CDWs unavoidably carry nontrivial Chern numbers that prevent the observation of a static magnetoelectric response. We discuss the experimental implications of our findings and provide models and analysis generalizing our results to nonmagnetic Weyl-and Dirac-CDWs.

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confidence: 99%

Axionic band topology in inversion-symmetric Weyl-charge-density waves

Wieder

Lin

Bradlyn

2020

Phys. Rev. Research

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“…Guguchia et al observed the two-gap s-wave symmetry of the superconducting order parameter in T d -MoTe 2 , and suggested a higher possibility of a topologically non-trivial s +− state in T d -MoTe 2 [ 40 ]. A fast-mode oscillation of the critical current I c versus magnetic field B along the edge was observed in T d -MoTe 2 by Wang et al, which was generated by fluxoid quantization and indicated the existence of a robust edge supercurrent [ 41 ]. As the breaking of the time-reversal symmetry or inversion symmetry is the prerequisite for WSM, T d -MoTe 2 was predicted as a Type-II WSM due to its noncentrosymmetric lattice structure [ 26 ].…”

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confidence: 99%

Recent Progress in Two-Dimensional MoTe2 Hetero-Phase Homojunctions

Guo

Liu

2021

Nanomaterials

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With the demand for low contact resistance and a clean interface in high-performance field-effect transistors, two-dimensional (2D) hetero-phase homojunctions, which comprise a semiconducting phase of a material as the channel and a metallic phase of the material as electrodes, have attracted growing attention in recent years. In particular, MoTe2 exhibits intriguing properties and its phase is easily altered from semiconducting 2H to metallic 1T′ and vice versa, owing to the extremely small energy barrier between these two phases. MoTe2 thus finds potential applications in electronics as a representative 2D material with multiple phases. In this review, we briefly summarize recent progress in 2D MoTe2 hetero-phase homojunctions. We first introduce the properties of the diverse phases of MoTe2, demonstrate the approaches to the construction of 2D MoTe2 hetero-phase homojunctions, and then show the applications of the homojunctions. Lastly, we discuss the prospects and challenges in this research field.

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“…Moreover, monolayer 2H MoTe 2 provides a great platform for developing phase-change devices because of the reversible phase transition of monolayer 2H to 1T′ MoTe 2 12 . The 1T′ MoTe 2 is the Weyl superconductor with an edge supercurrent 15 , and monolayer 1T′ is a quantum spin Hall insulator 16 . shows hexagonal shape, a typical shape of 2H single crystals (with size ranging from a few to tens of micrometers, Fig.…”

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confidence: 99%

Liquid-vapor Growth of Atomically Thin Metal Tellurides with Controllable Polymorphism

Zhou¹,

Zhang²,

Zhang³

et al. 2021

Preprint

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Atomically thin transition metal dichalcogenides (TMDs), together with their polymorphism, provide promising alternatives for next generation electronic devices and a platform to explore exotic quantum phenomena. However, a large-scale synthesis method that can reliably produce high-quality two-dimensional (2D) TMDs with controlled phase is still lacking. Instead, TMDs with high concentration of defects and defect-stabilized metastable crystalline phases are often obtained via conventional chemical vapor deposition. Here we developed a liquid-vapor (LV) technique to exploit liquid precursors to significantly suppress the equilibrium shift to the decomposition direction and successfully synthesized high-quality TMDs. We highlight the importance of exploiting the synergism of equilibrium and kinetics to facilitate the synthesis reaction (forward) and to impede decomposition (reverse). A high concentration of reactants in the liquid phase also maximizes the kinetic rate of defect repairing. We demonstrated the advantages of LV method by synthesizing diverse high-quality 2D metal tellurides with controllable polymorphs, which would be challenging, if not impossible, to realize by using conventional methods due to weak metal-tellurium bonds, thermal instability and the co-existence of mixed crystalline phases. In particular, we successfully synthesized high-quality monolayer 2H MoTe2, which is only possible when Te defect level is substantially suppressed. Our approach provides a new paradigm in high-quality and large-scale materials synthesis and can be readily extended to a variety of quantum materials, potentially accelerating both research and industrial initiatives.

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Evidence for an edge supercurrent in the Weyl superconductor MoTe ₂

Cited by 92 publications

References 21 publications

Axionic band topology in inversion-symmetric Weyl-charge-density waves

Axionic band topology in inversion-symmetric Weyl-charge-density waves

Recent Progress in Two-Dimensional MoTe2 Hetero-Phase Homojunctions

Liquid-vapor Growth of Atomically Thin Metal Tellurides with Controllable Polymorphism

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Evidence for an edge supercurrent in the Weyl superconductor MoTe 2

Cited by 92 publications

References 21 publications

Axionic band topology in inversion-symmetric Weyl-charge-density waves

Axionic band topology in inversion-symmetric Weyl-charge-density waves

Recent Progress in Two-Dimensional MoTe2 Hetero-Phase Homojunctions

Liquid-vapor Growth of Atomically Thin Metal Tellurides with Controllable Polymorphism

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Evidence for an edge supercurrent in the Weyl superconductor MoTe ₂