Observation of superconductivity induced by a point contact on 3D Dirac semimetal Cd3As2 crystals

Wang, He; Wang, Huichao; Liu, Haiwen; Lu, Hong; Wang, Yang; Jia, Shuang; Liu, Xiong-Jun; Xie, Xiaoming; Wei, Jian; Wang, Jian

doi:10.1038/nmat4456

Cited by 239 publications

(183 citation statements)

References 37 publications

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“…Interestingly, we also notice two recent point contact studies on Cd 3 As 2 polycrystal and single crystal, respectively. 43,44 In both studies, indication of superconductivity was found around the point contact region on the surface, with T c comparable to ours. In particular, no superconductivity is observed by the 'soft' point contact technique, therefore it was suggested that the superconductivity observed around the point contact region under the 'hard' tip might be induced by the local pressure.…”

Section: Pressure-induced Superconductivitysupporting

confidence: 86%

“…In particular, no superconductivity is observed by the 'soft' point contact technique, therefore it was suggested that the superconductivity observed around the point contact region under the 'hard' tip might be induced by the local pressure. 44 In this sense, our bulk resistance measurements under hydrostatic pressure confirm pressure-induced superconductivity in Cd 3 As 2 , although the local pressure under the 'hard' tip is more like uniaxial stress.…”

Section: Pressure-induced Superconductivitysupporting

confidence: 55%

“…In ref. 44, the observation of zero bias conductance peak and double conductance peaks under 'hard' tip reveal p-wave like unconventional superconductivity in Cd 3 As 2 . Considering its special topological property, they suggested that Cd 3 As 2 under high pressure is a candidate of the TSC.…”

Section: Discussionmentioning

confidence: 83%

“…Considering its special topological property, they suggested that Cd 3 As 2 under high pressure is a candidate of the TSC. 44 Furthermore, a recent theoretical work also argued that Cd 3 As 2 likely realises a TSC with bulk point nodes and a surface Majorana fermion quartet. 45 Under high pressure, the symmetry-lowering effect may stabilise the TSC phase by increasing the condensation energy, as the point nodes in the TSC phase are gapped when C 4 reduces to C 2 (the structure phase transition from tetragonal to monoclinic).…”

Section: Discussionmentioning

confidence: 99%

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Pressure-induced superconductivity in the three-dimensional topological Dirac semimetal Cd3As2

et al. 2016

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The recently discovered Dirac and Weyl semimetals are new members of topological materials. Starting from them, topological superconductivity may be achieved, e.g., by carrier doping or applying pressure. Here we report high-pressure resistance and X-ray diffraction study of the three-dimensional topological Dirac semimetal Cd 3 As 2 . Superconductivity with T c ≈2.0 K is observed at 8.5 GPa. The T c keeps increasing to about 4.0 K at 21.3 GPa, then shows a nearly constant pressure dependence up to the highest pressure 50.9 GPa. The X-ray diffraction measurements reveal a structure phase transition around 3.5 GPa. Our observation of superconductivity in pressurised topological Dirac semimetal Cd 3 As 2 provides a new candidate for topological superconductor, as argued in a recent point contact study and a theoretical work.

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Section: Pressure-induced Superconductivitysupporting

confidence: 86%

Section: Pressure-induced Superconductivitysupporting

confidence: 55%

Section: Discussionmentioning

confidence: 83%

Section: Discussionmentioning

confidence: 99%

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Pressure-induced superconductivity in the three-dimensional topological Dirac semimetal Cd3As2

et al. 2016

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“…We notice that this kind of setup has recently been utilized to study the pressure-induced superconductivity in Cd 3 As 2 . 44 Furthermore, we point out that the lattice strain would generally be inhomogeneous in real strained samples, and more complicated strain profiles could be naturally realized. Given that the current technology can map out strain distribution with nanometer spatial resolution and with a precision~0.1%, 45 as long as the strain is slowly varying, one can compute the effective metric and study the quasiparticle propagation under artificial gravity using the idea presented here.…”

Section: Discussionmentioning

confidence: 97%

Artificial gravity field, astrophysical analogues, and topological phase transitions in strained topological semimetals

Guan¹,

Yu²,

Liu³

et al. 2017

npj Quant Mater

144

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Effective gravity and gauge fields are emergent properties intrinsic for low-energy quasiparticles in topological semimetals. Here, taking two Dirac semimetals as examples, we demonstrate that applied lattice strain can generate warped spacetime, with fascinating analogues in astrophysics. Particularly, we study the possibility of simulating black-hole/white-hole event horizons and gravitational lensing effect. Furthermore, we discover strain-induced topological phase transitions, both in the bulk materials and in their thin films. Especially in thin films, the transition between the quantum spin Hall and the trivial insulating phases can be achieved by a small strain, naturally leading to the proposition of a novel piezo-topological transistor device. Possible experimental realizations and analogue of Hawking radiation effect are discussed. Our result bridges multiple disciplines, revealing topological semimetals as a unique table-top platform for exploring interesting phenomena in astrophysics and general relativity; it also suggests realistic materials and methods to achieve controlled topological phase transitions with great potential for device applications.npj Quantum Materials (2017) 2:23 ; doi:10.1038/s41535-017-0026-7 INTRODUCTIONRelativity is a fundamental aspect for all elementary particles in the high-energy regime. In condensed matter physics, however, the relevant energy scale we probe is much lower (compared with, e.g., the electron rest mass), hence the electronic dynamics is usually considered as non-relativistic. Nonetheless, due to interactions with lattice and between electrons themselves, the electron properties in crystalline solids are strongly renormalized, and the resulting low-energy electron quasiparticles can behave drastically different from free electrons. Remarkably, in a class of recently discovered topological semimetal materials, the band structures feature nontrivial band-crossings close to the Fermi level, around which the low-energy quasiparticles become massless and resemble relativistic particles. For example, in socalled Weyl semimetals, the Fermi surface consists of isolated band-crossing points, each carrying a topological charge of ±1 corresponding to its chirality, and the low-energy quasiparticles mimic the Weyl fermions in high-energy physics.1, 2 With further protection from crystalline symmetry, a pair of Weyl points can be stabilized at the same point (called the Dirac point) in the energy-momentum space, realizing the Dirac semimetal (DSM) phase.3 A number of 3D materials have been predicted to host Weyl/Dirac points.4-9 Some of them, including the DSMs Na 3 Bi and Cd 3 As 2 , 10,11 have been confirmed in recent experiments.

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2D Metallic Transition‐Metal Dichalcogenides: Structures, Synthesis, Properties, and Applications

Zhao

Shen

Zhang

et al. 2021

Adv Funct Materials

182

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2D materials and the associated heterostructures define an ideal material platform for investigating physical and chemical properties, and exhibiting new functional applications in (opto)electronic devices, electrocatalysis, and energy storage. 2D transition metal dichalcogenides (2D TMDs), as a member of the 2D materials family including 2D semiconducting TMDs (s-TMDs) and 2D metallic/semimetallic TMDs (m-TMDs) have attracted considerable attention in the scientific community. Over the past decade, the 2D s-TMDs have been extensively researched and reviewed elsewhere. Because of their distinctive physical properties including intrinsic magnetism, chargedensity-wave order and superconductivity, and potential applications, such as high-performance electronic devices, catalysis, and as metal electrode contacts, 2D m-TMDs have grabbed widespread attention in recent years. However, reviews demonstrating the m-TMDs systematically and comprehensively have been rarely reported. Here, the recent advances in 2D m-TMDs in the aspects of their unique structures, synthetic approaches, distinctive physical properties, and functional applications are highlighted. Finally, the current challenges and perspectives are discussed.

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Observation of superconductivity induced by a point contact on 3D Dirac semimetal Cd3As2 crystals

Cited by 239 publications

References 37 publications

Pressure-induced superconductivity in the three-dimensional topological Dirac semimetal Cd3As2

Pressure-induced superconductivity in the three-dimensional topological Dirac semimetal Cd3As2

Artificial gravity field, astrophysical analogues, and topological phase transitions in strained topological semimetals

2D Metallic Transition‐Metal Dichalcogenides: Structures, Synthesis, Properties, and Applications

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