Tunneling chirality Hall effect in type-I Weyl semimetals,Physical Review B

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Tunneling chirality Hall effect in type-I Weyl semimetals
Physical Review B ( IF 3.2 ) Pub Date : 2024-07-18 , DOI: 10.1103/physrevb.110.024511
W. Zeng ₁

Affiliation

We propose a tilt-assisted tunneling chirality Hall effect in the normal metal-superconductor (NS) junctions based on the time-reversal-broken type-I Weyl semimetals. It is found that the chirality-dependent skew reflection occurs at the NS interface due to the tilt of the Weyl cones, which is responsible for the nonzero transverse chirality Hall currents. Distinct from the Hall effect induced by the Berry curvature, we further illustrate that the transverse chirality current here is determined by the symmetry of the tilted Weyl Hamiltonian. Specifically, both the transverse chirality Hall current and the transverse charge Hall current may occur when the tilt of the Weyl cones break the mirror symmetry

(M)

of the Weyl Hamiltonian. However, a pure transverse chirality Hall current with zero net charge is present when the tilt breaks

M

symmetry but preserves the combined

MC

symmetry, where

C

represents the

Z_{2}

exchange symmetry.

中文翻译：

I 型外尔半金属中的隧道手性霍尔效应

我们提出了基于时间反转断裂的 I 型 Weyl 半金属的普通金属-超导体（NS）结中的倾斜辅助隧道手性霍尔效应。研究发现，由于外尔锥体的倾斜，NS 界面处发生了手性相关的倾斜反射，这导致了非零横向手性霍尔电流。与贝里曲率引起的霍尔效应不同，我们进一步说明这里的横向手性电流是由倾斜的韦尔哈密顿量的对称性决定的。具体而言，当Weyl锥体的倾斜打破Weyl哈密顿量的镜像对称