Discovery of tip induced unconventional superconductivity on Weyl semimetal

Wang, He; Wang, Huichao; Chen, Yuqin; Luo, Jiawei; Yuan, Zhujun; Li, Jun; Wang, Yong; Jia, Shuang; Liu, Xiong-Jun; Wei, Jian; Wang, Jian

doi:10.1016/j.scib.2017.02.009

Cited by 83 publications

(54 citation statements)

References 42 publications

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“…We also discuss the subtle role played by inversion symmetry by contrasting a scalar with a pseudoscalar pair potential [10]. The absence of the chirality blockade for pseudoscalar pairing explains why it did not appear in the many previous studies of Andreev reflection in a Weyl semimetal [11][12][13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 89%

Chirality blockade of Andreev reflection in a magnetic Weyl semimetal

et al. 2017

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A Weyl semimetal with broken time-reversal symmetry has a minimum of two species of Weyl fermions, distinguished by their opposite chirality, in a pair of Weyl cones at opposite momenta ±K that are displaced in the direction of the magnetization. Andreev reflection at the interface between a Weyl semimetal in the normal state (N) and a superconductor (S) that pairs ±K must involve a switch of chirality, otherwise it is blocked. We show that this "chirality blockade" suppresses the superconducting proximity effect when the magnetization lies in the plane of the NS interface. A Zeeman field at the interface can provide the necessary chirality switch and activate Andreev reflection.

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Section: Introductionmentioning

confidence: 89%

Chirality blockade of Andreev reflection in a magnetic Weyl semimetal

et al. 2017

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“…19 Previously, Wang et al observed superconducting-like anomaly in the point contact tunneling spectrum on TaAs. 20 The recent measurements under high pressure on Weyl semimetals NbAs and TaAs have revealed some interesting physics, 21,22 but did not show the trace of superconductivity. 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.…”

Section: Introductionmentioning

confidence: 99%

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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“…The point-contact measurements found an SC phase with the on-site critical temperature of approximately 6 K at the interface between the tip and the TaAs single crystals, which is induced by the pressure applied by the tip [85]. The resistance measurements of TaP under the pressure of 70 GPa also showed evidence of an SC transition, which became more prominent when the pressure was released to ambient [86].…”

Section: Measurements In Extreme Conditionsmentioning

confidence: 87%

Crystal growth and electrical transport properties of niobium and tantalum monopnictide and dipnictide semimetals

Jia

2017

Front. Phys.

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The discovery of the first Weyl semimetal tantalum monoarsenide has greatly promoted physical research on the niobium and tantalum pnictide compounds. Crystallizing into the NbAs-and OsGe 2 -type structures, these mono-and di-pnictide semimetals manifest exotic electrical transport properties in magnetic field, which only occur in their single-crystalline forms. All the unusual electrical properties correspond to their poor carriers, which are indeed vulnerable to various crystal defects. In this review article, we present a comprehensive comparison of the crystal growth and electrical transport properties of the two semimetal families. We then discuss in detail the possible characteristic transport features, such as the chiral anomaly of Weyl quasiparticles. We emphasize the importance of crystal growth and sample manipulation for exploring the unique topological properties of Weyl semimetals in the future.

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Discovery of tip induced unconventional superconductivity on Weyl semimetal

Cited by 83 publications

References 42 publications

Chirality blockade of Andreev reflection in a magnetic Weyl semimetal

Chirality blockade of Andreev reflection in a magnetic Weyl semimetal

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

Crystal growth and electrical transport properties of niobium and tantalum monopnictide and dipnictide semimetals

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