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

He, Lian; Jia, Yating; Zhang, Sijia; Hong, X. C.; Jin, Changqing; Li, Shiyan

doi:10.1038/npjquantmats.2016.14

Cited by 161 publications

(143 citation statements)

References 44 publications

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“…The emergence of pressure-induced superconductivity in TI Bi 2 Se 3 , 43 Dirac semimetal Cd 3 As 2 , 47 and Weyl semimetal TaP 48 is usually accompanied by a structural phase transition, which inevitably breaks the crystal symmetry protecting the topological state. However, the pressure-induced superconductivity in MoP emerges without concomitant structural phase transition, implying the coexistence of superconductivity with nontrivial band topology at high pressure.…”

Section: Discussionmentioning

confidence: 99%

Pressure-induced superconductivity in MoP

Chi

Chen

et al. 2018

npj Quant Mater

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Topological semimetal, a novel state of quantum matter hosting exotic emergent quantum phenomena dictated by the nontrivial band topology, has emerged as a new frontier in condensed-matter physics. Very recently, the coexistence of triply degenerate points of band crossing and Weyl points near the Fermi level was theoretically predicted and experimentally identified in MoP. Via high-pressure electrical transport measurements, we report here the emergence of pressure-induced superconductivity in MoP with a critical transition temperature T c of ca. 2.5 K at ca. 30 GPa. No structural phase transition is observed up to ca. 60 GPa via synchrotron X-ray diffraction study. Accordingly, the topologically nontrivial band protected by the crystal structure symmetries and superconductivity are expected to coexist at pressures above 30 GPa, consistent with density functional theory calculations. Thus, the pressurized MoP represents a promising candidate of topological superconductor. Our finding is expected to stimulate further exploitation of exotic emergent quantum phenomena in novel unconventional fermion system. npj Quantum Materials (2018) 3:28 ; doi:10.1038/s41535-018-0102-7 INTRODUCTIONThe low-energy, long-wavelength quasiparticle excitation near the Fermi level as counterpart of high-energy relativistic Dirac, Weyl, and Majorana fermion has been successfully demonstrated in topological quantum matter with nontrivial band topology such as topological insulator (TI), topological Dirac semimetal (TDS), topological Weyl semimetal (TWS), and topological superconductor (TSC) over the last decade. [1][2][3][4][5][6][7][8][9][10][11][12][13][14] In stark contrast with the gapped bulk state of both TI and TSC, the defining hallmark of TDS and TWS is the presence of linear crossing points of conduction band and valence band near the Fermi level, where two or four bands are exactly degenerate at certain momentum-energy value in the first Brillouin zone, giving rise to a gapless bulk state. Novel macroscopic quantum phenomena they exhibit such as ultrahigh mobility of charge carriers, extremely large linear magnetoresistance, quantum anomalous Hall effect, and chiral anomaly are not only of fundamental interest but also hold potential applications. The recent breakthrough in predicting and identifying unconventional "new fermion" beyond conventional Dirac and Weyl fermion sparked new research interest in the field of topological semimetal. [15][16][17][18][19][20] Among the symmetries of 230 crystal space groups in condensed-matter physics, the threefold, sixfold, and eightfold degenerate quasiparticle excitation emanating from the multiply degenerate points of band crossing near the Fermi level can be protected in a crystal lattice either by symmorphic rotation combined with mirror symmetries or by non-symmorphic

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Section: Discussionmentioning

confidence: 99%

Pressure-induced superconductivity in MoP

Chi

Chen

et al. 2018

npj Quant Mater

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“…Meanwhile, their complicated band structures make the detailed analysis of FS through the Shubnikov-de Haas (SdH) oscillations rather difficult. In contrast, Cd 3 As 2 has been shown to exhibit remarkable changes in transport properties by applying pressure or stress [20][21][22][23]. A structural phase transition from a metallic tetragonal phase to a semiconducting monoclinic one at around 2.57 GPa has been reported in Cd 3 As 2 [20].…”

Section: Introductionmentioning

confidence: 97%

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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“…Recently, theoretical investigations have proposed that the Dirac semimetal Cd 3 As 2 is promising for topological superconductivity [17,18]. In addition, the signatures of unconventional superconductivity in Cd 3 As 2 have been reported through pressure-loaded [19] and point-contacted [20,21] experiments. However, the proximity effect-induced superconductivity in Cd 3 As 2 has still not yet been achieved, which is more important for practical devices without complicated pressure loading.…”

Section: Introductionmentioning

confidence: 99%

Bulk and surface states carried supercurrent in ballistic Nb-Dirac semimetal Cd3As2 nanowire-Nb junctions

Wang

et al. 2018

Phys. Rev. B

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A three-dimensional Dirac semimetal has bulk Dirac cones in all three momentum directions and Fermi arc like surface states, and can be converted into a Weyl semimetal by breaking time-reversal symmetry. However, the highly conductive bulk state usually hides the electronic transport from the surface state in Dirac semimetal. Here, we demonstrate the supercurrent carried by bulk and surface states in Nb-Cd 3 As 2 nanowire-Nb short and long junctions, respectively. For the ∼1-μm-long junction, the Fabry-Pérot interferences-induced oscillations of the critical supercurrent are observed, suggesting the ballistic transport of the surface states carried supercurrent, where the bulk states are decoherent and the topologically protected surface states still stay coherent. Moreover, a superconducting dome is observed in the long junction, which is attributed to the enhanced dephasing from the interaction between surface and bulk states as tuning gate voltage to increase the carrier density. The superconductivity of topological semimetal nanowire is promising for braiding of Majorana fermions toward topological quantum computing.

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

Cited by 161 publications

References 44 publications

Pressure-induced superconductivity in MoP

Pressure-induced superconductivity in MoP

Evidence for pressure-induced node-pair annihilation in Cd3As2

Bulk and surface states carried supercurrent in ballistic Nb-Dirac semimetal Cd3As2 nanowire-Nb junctions

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