Pressure-Induced New Topological Weyl Semimetal Phase in TaAs

Zhou, Yonghui; Lu, Pengchao; Du, Yulei; Zhu, Xiangde; Zhang, Ganghua; Zhang, Ranran; Shao, Ding-Fu; Chen, Xuliang; Wang, Xuefei; Tian, Mingliang; Sun, Junqiang; Wan, Xiangang; Yang, Zhaorong; Yang, Wenge; Zhang, Yuheng; Xing, D. Y.

doi:10.1103/physrevlett.117.146402

Cited by 79 publications

(67 citation statements)

References 52 publications

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“…Many interesting physical phenomena, such as quantum criticality and unconventional superconductivity, have been intensively studied under pressure [14,15]. Unfortunately, several topological semimetals, including NbAs [16,17], TaAs [18], and NbP [19], were reported to behave as a strong crystalline lattice, where the external pressure over a moderate range cannot easily tune the Fermi surface (FS) and the band structure. Meanwhile, their complicated band structures make the detailed analysis of FS through the Shubnikov-de Haas (SdH) oscillations rather difficult.…”

Section: Introductionmentioning

confidence: 99%

Evidence for pressure-induced node-pair annihilation in Cd3As2

et al. 2017

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We report a magnetotransport study of Dirac semimetal Cd 3 As 2 under high pressure. The Shubnikov-de Haas oscillations are measured at different pressures to reveal the evolution of the Fermi surface. A sudden change in the phase factor of the oscillations occurs at 1.3 GPa along with the unanticipated shrinkage of the Fermi surface, which is well below the structure transition point from the tetragonal to the monoclinic structure (∼2.5 GPa). High-pressure x-ray diffraction also reveals an anisotropic compression of the Cd 3 As 2 lattice around a similar pressure. Through the first-principles calculations, we find that such axial compression along the c direction will shift the Dirac nodes towards the Brillouin zone center and will eventually introduce a finite energy gap. Our result unveils a possible topological phase transition in pressurized Cd 3 As 2 without structure transition.

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Section: Introductionmentioning

confidence: 99%

Evidence for pressure-induced node-pair annihilation in Cd3As2

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 increase is not gradual, but rather abrupt in the region of 15GP a. It was discovered recently that, while parameters of the system (the electron -phonon coupling, Debye frequency Ω) between two structural phase transitions smoothly depend on a pressure, the tilt parameter is very sensitive to a stress 15,21 . Our result might provide an explanation of a spike in dependence of T c on pressure in single crystals observed in many superconducting semi-metals [26][27][28] .…”

Section: Discussionmentioning

confidence: 99%

“…The pressure modifies the spin orbit coupling that in turn determines the topology of the Fermi surface of these novel materials 15 . Very recently the topological transition in Weyl semi -metal under pressure was observed 21 . This transition is an ideal example of the "2.5 transition" mentioned above.…”

Section: Introductionmentioning

confidence: 99%

Effect of the type-I to type-II Weyl semimetal topological transition on superconductivity

Rosenstein

Shapiro

et al. 2017

Phys. Rev. B

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The influence of recently discovered topological transition between type I and type II Weyl semimetals on superconductivity is considered. A set of Gorkov equations for weak superconductivity in Weyl semi-metal under topological phase transition is derived and solved. The critical temperature and superconducting gap both have spike in the point the transition point as function of the tilt parameter of the Dirac cone determined in turn by the material parameters like pressure. The spectrum of superconducting excitations is different in two phases: the sharp cone pinnacle is characteristic for a type I, while two parallel almost flat bands, are formed in type II. Spectral density is calculated on both sides of transition demonstrate different weight of the bands. The superconductivity thus can be used as a clear indicator for the topological transformation. Results are discussed in the light of recent experiments.

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Pressure-Induced New Topological Weyl Semimetal Phase in TaAs

Cited by 79 publications

References 52 publications

Evidence for pressure-induced node-pair annihilation in Cd3As2

Evidence for pressure-induced node-pair annihilation in Cd3As2

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

Effect of the type-I to type-II Weyl semimetal topological transition on superconductivity

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