Anisotropic gapping of topological Weyl rings in the charge-density-wave superconductor InxTaSe2

Superconductivity in doped Weyl semimetal Mo$_{0.9}$Ir$_{0.1}$Te$_{2}$ with broken inversion symmetry

This work presents the emergence of superconductivity in Ir - doped Weyl semimetal T$_d$ - MoTe$_{2}$ with broken inversion symmetry. Chiral anomaly induced planar Hall effect and anisotropic magneto-resistance confirm the topological semimetallic nature of Mo$_{1-x}$Ir$_{x}$Te$_{2}$. Observation of weak anisotropic, moderately coupled type-II superconductivity in T$_d$ -Mo$_{1-x}$Ir$_{x}$Te$_{2}$ makes it a promising candidate for topological superconductor.

Higher-order Weyl superconductors with anisotropic Weyl-point connectivity

Weyl superconductors feature Weyl points at zero energy in the three-dimensional (3D) Brillouin zone and arc states that connect the projections of these Weyl points on the surface. We report that higher-order Weyl superconductors can be realized in odd-parity topological superconductors with time-reversal symmetry being broken by periodic driving. Different from conventional Weyl points, the higher-order Weyl points in the bulk separate 2D first- and second-order topological phases, while on the surface, their projections are connected not only by conventional surface Majorana arcs, but also …

Motion of an Impurity in a Bose-Einstein Condensate with Weyl Spin-Orbit Coupling: Non-collinear Drag Force and Anisotropic Critical Velocity

We consider the motion of a point-like impurity through a three-dimensional two-component Bose-Einstein condensate subject to Weyl spin-orbit coupling. Using linear-response theory, we calculate the drag force felt by the impurity and the associated anisotropic critical velocity from the spectrum of elementary excitations. The drag force is shown to be generally not collinear with the velocity of the impurity. This unusual behavior is a consequence of condensation into a finite-momentum state due to the spin-orbit coupling.

Phase transition with trivial quantum criticality in anisotropic Weyl semimetal

When a metal undergoes continuous quantum phase transition, the correlation length diverges at the critical point and the quantum fluctuation of order parameter behaves as a gapless bosonic mode. Generically, the coupling of this boson to fermions induces a variety of unusual quantum critical phenomena, such as non-Fermi liquid behavior and various emergent symmetries. Here, we perform a renormalization group analysis of the semimetal-superconductor quantum criticality in a three-dimensional anisotropic Weyl semimetal. Surprisingly, distinct from previously studied quantum critical systems, th…

Anisotropic phonon-mediated electronic transport in chiral Weyl semimetals

Discovery and observations of exotic, quantized optical and electrical responses have sparked renewed interest in nonmagnetic chiral crystals. Within this class of materials, six group V transition metal ditetrelides, that is, XY$_2$ (X = V, Nb, Ta and Y = Si, Ge), host composite Weyl nodes on high-symmetry lines, with Kramers-Weyl fermions at time-reversal invariant momenta. In addition, at least two of these materials, NbGe$_2$ and NbSi$_2$, exhibit superconducting transitions at low temperatures. The interplay of strong electron-phonon interaction and complex Fermi surface topology present …

强空穴掺杂K（x）Ba（1-x）Fe2As2中的奇异d波超导电性

Exotic d-wave superconductivity in strongly hole doped K(x)Ba(1-x)Fe2As2

我们研究了K（x）Ba（1-x）Fe 2As 2122化合物中从中等到强空穴掺杂的超导相。使用功能重整化群，我们表明，而系统开发的nodeless各向异性的s+-序参量在中等掺杂制度，在强空穴掺杂的电子口袋缺口驱动系统进入节点的cos（kx）cos（ky）d波超导状态。这是在协议与最近的实验证据从测量KFe 2 As 2看到一个节点的序参量在极端掺杂制度。磁不稳定性被强烈抑制。仅存在空穴袋的情况被认为在结构上类似于仅存在电子袋的情况，如KxFe 2Se 2所示。