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Charge Oscillations in Quantum Spin Hall Constrictions
Physica Status Solidi-Rapid Research Letters ( IF 2.8 ) Pub Date : 2021-05-20 , DOI: 10.1002/pssr.202100097
Niccolo Traverso Ziani 1, 2 , Fabio Cavaliere 1, 2 , Maura Sassetti 1, 2
Affiliation  

Constrictions between 1D helical edge states represent a useful tool for the realization of devices based on topological materials. Indeed, they complement superconductivity and magnetic barriers as gaps allowing to enlarge the functionalities of topological nanostructures. Recent experiments point to the direction that electronic interactions are not negligible in such systems. Herein, the interaction-induced oscillations of the local electronic density at constrictions between helical edges are theoretically inspected. The system is in the quantum dot configuration thanks to magnetic barriers. By means of bosonization, it is shown that the fractional charge oscillations, predicted for single edges, can persist. On top of that, oscillations involving both edges and with different wave vectors can appear. It is argued that the dominant oscillation can be discriminated by varying the angle of magnetization of the barriers, thus providing information about the dominant interaction mechanisms.

中文翻译:

量子自旋霍尔收缩中的电荷振荡

一维螺旋边缘状态之间的收缩代表了实现基于拓扑材料的设备的有用工具。事实上,它们补充了超导性和磁势垒作为允许扩大拓扑纳米结构功能的间隙。最近的实验指出了这样的系统中电子相互作用不可忽略的方向。在这里,理论上检查了螺旋边缘之间收缩处局部电子密度的相互作用引起的振荡。由于磁势垒,该系统处于量子点配置中。通过玻色化,表明对于单个边缘预测的分数电荷振荡可以持续存在。最重要的是,可能会出现涉及两个边缘和不同波矢量的振荡。
更新日期:2021-07-12
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