Topological Tuning in Three-Dimensional Dirac Semimetals

Narayan, Awadhesh; Sante, Domenico Di; Picozzi, Silvia; Sanvito, Stefano

doi:10.1103/physrevlett.113.256403

Cited by 65 publications

(82 citation statements)

References 31 publications

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“…The effect of anisotropic compression is precisely that of reducing the mass inversion strength and can be mimicked by tuning the parameter m 0 in the low-energy model. Remarkably, this is similar to the effect of alloying Cd 3 As 2 with a lighter element, which also causes such a motion and annihilation of Dirac points [50]. Despite the slight difference of the critical c/a value given by theory and experiments, we found that their overall decreasing trend of energy gap when reducing c/a is quite similar.…”

Section: Resultssupporting

confidence: 78%

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: Resultssupporting

confidence: 78%

Evidence for pressure-induced node-pair annihilation in Cd3As2

et al. 2017

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“…Recent studies on the solid solutions of TlBiSe 2−x S x and Bi 2−x In x Se 3 have confirmed the existence of a quantum phase transition tuned by chemical doping from topological insulators to trivial band insulators 29, 30 . A topological phase transition from a 3D Dirac semimetal to a trivial semiconductor was predicted in Na 3 Bi 1−x Sb x and Cd 3 (As 1−x P x ) 2 by first-principle calculations as well 31 .…”

Section: Introductionmentioning

confidence: 91%

Topological Phase Transition in Single Crystals of (Cd1−xZnx)3As2

Zhang

Bian

et al. 2017

Sci Rep

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Single crystals of (Cd1−xZnx)3As2 were synthesized from high-temperature solutions and characterized in terms of their structural and electrical properties. Based on the measurements of resistivity and Hall signals, we revealed a chemical-doping-controlled transition from a three-dimensional Dirac semimetal to a semiconductor with a critical point xc ~ 0.38. We observed structural transitions from a body-center tetragonal phase to a primitive tetragonal phase then back to a body-center tetragonal phase in the solid solutions as well, which are irrelevant to the topological phase transition. This continuously tunable system controlled by chemical doping provides a platform for investigating the topological quantum phase transition of three-dimensional Dirac electrons.

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“…An expanded view of the dispersion along the Γ − A direction (inset) shows the symmetry-protected intersection of two two fold degenerate branches with distinct Jz rotational eigenvalues at a Dirac point along the symmetry axis. (Adapted from calculations for thin films in the A 3 Bi family (Narayan et al, 2014).…”

Section: A Dirac Semimetal From Band Inversionmentioning

confidence: 99%

Weyl and Dirac semimetals in three-dimensional solids

2018

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Weyl and Dirac semimetals are three dimensional phases of matter with gapless electronic excitations that are protected by topology and symmetry. As three dimensional analogs of graphene, they have generated much recent interest. Deep connections exist with particle physics models of relativistic chiral fermions, and -despite their gaplessness -to solid-state topological and Chern insulators. Their characteristic electronic properties lead to protected surface states and novel responses to applied electric and magnetic fields. The theoretical foundations of these phases, their proposed realizations in solid state systems, recent experiments on candidate materials, as well as their relation to other states of matter are reviewed.

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Topological Tuning in Three-Dimensional Dirac Semimetals

Cited by 65 publications

References 31 publications

Evidence for pressure-induced node-pair annihilation in Cd3As2

Evidence for pressure-induced node-pair annihilation in Cd3As2

Topological Phase Transition in Single Crystals of (Cd1−xZnx)3As2

Weyl and Dirac semimetals in three-dimensional solids

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