Robust edge photocurrent response on layered type II Weyl semimetal WTe2.,Nature Communications

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Robust edge photocurrent response on layered type II Weyl semimetal WTe2.
Nature Communications ( IF 14.7 ) Pub Date : 2019-12-16 , DOI: 10.1038/s41467-019-13713-1
Qinsheng Wang _{1,

2} , Jingchuan Zheng _{1,

2} , Yuan He _{1,

2} , Jin Cao ₁ , Xin Liu ₃ , Maoyuan Wang ₁ , Junchao Ma ₃ , Jiawei Lai ₃ , Hong Lu ₃ , Shuang Jia _{3,

4} , Dayu Yan ₅ , Youguo Shi ₅ , Junxi Duan _{1,

2} , Junfeng Han _{1,

2} , Wende Xiao _{1,

2} , Jian-Hao Chen _{3,

4} , Kai Sun ₆ , Yugui Yao _{1,

2} , Dong Sun _{3,

4}

Affiliation

Photosensing and energy harvesting based on exotic properties of quantum materials and new operation principles have great potential to break the fundamental performance limit of conventional photodetectors and solar cells. Weyl semimetals have demonstrated novel optoelectronic properties that promise potential applications in photodetection and energy harvesting arising from their gapless linear dispersion and Berry field enhanced nonlinear optical effect at the vicinity of Weyl nodes. In this work, we demonstrate robust photocurrent generation at the edge of Td-WTe2, a type-II Weyl semimetal, due to crystalline-symmetry breaking along certain crystal fracture directions and possibly enhanced by robust fermi-arc type surface states. This edge response is highly generic and arises universally in a wide class of quantum materials with similar crystal symmetries. The robust and generic edge current response provides a charge separation mechanism for photosensing and energy harvesting over broad wavelength range.

中文翻译：

层状 II 型 Weyl 半金属 WTe2 的鲁棒边缘光电流响应。

基于量子材料的奇异特性和新操作原理的光传感和能量收集具有突破传统光电探测器和太阳能电池基本性能限制的巨大潜力。外尔半金属已表现出新颖的光电特性，由于其无间隙线性色散和外尔节点附近的贝里场增强的非线性光学效应，有望在光电探测和能量收集方面具有潜在的应用。在这项工作中，我们证明了在 Td-WTe2（一种 II 型外尔半金属）的边缘处产生了强大的光电流，这是由于晶体对称性沿某些晶体断裂方向破裂，并且可能通过强大的费米弧型表面态而增强。这种边缘响应非常通用，普遍出现在具有相似晶体对称性的各种量子材料中。稳健且通用的边缘电流响应为宽波长范围内的光传感和能量收集提供了电荷分离机制。

更新日期：2019-12-17

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