驱动外尔半金属中的灾变、光学多稳态与手性光电流滞回
Catastrophes, Optical Multistabilities, and Chiral Photocurrent Hysteresis in Driven Weyl Semimetals
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中文总结 AI 辅助
本文研究外尔半金属中等离子体屏蔽对光伏响应的影响，发现非线性屏蔽场可导致双稳态、滞回与灾变，并在破缺时间反演对称时产生手性光电流。
中文摘要 AI 辅助
外尔半金属独特的能带拓扑结构使其具有多种强光伏响应现象。本文探讨了等离子体屏蔽如何影响这些现象。我们发现，屏蔽场具有高度非线性，可能包含拓扑贡献，并能放大光响应，其自洽响应表现出双稳态的特征，包括滞回和灾变。双稳态源于极化随场振幅从线性到饱和的交叉，因为外尔锥中的载流子具有有界群速度 $v_F$。当时间反演对称性被破坏时，倾斜的外尔节点为面内电流增加了贝里曲率贡献，使非线性屏蔽响应具有螺旋度选择性。
英文摘要
The unique band topology of Weyl semimetals provides them with a diverse array of strong photovoltaic response phenomena. Here we explore how plasma screening affects these phenomena. We find that the screening field is highly nonlinear, can contain topological contributions, and can amplify the photoresponse, with the self-consistent response exhibiting the hallmarks of bistability, including hysteresis and catastrophes. The bistability emerges from a crossover from linear to saturated polarization as a function of the field amplitude, because carriers in a Weyl cone have bounded group speed $v_F$. When time-reversal symmetry is broken, tilted Weyl nodes add a Berry-curvature contribution to the in-plane current, making the nonlinear screening response helicity selective.
发表机构
- California Institute of Technology（加州理工学院）
- University of California, Irvine（加州大学尔湾分校）
- Niels Bohr Institute, University of Copenhagen（哥本哈根大学尼尔斯·玻尔研究所）
机构由 AI 辅助整理，请以论文原文为准。
