Multi-orbital topolectrical circuit for topological quantum states

IF 2.5 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY
Junjie Yao, Xiamin Hao, Biyu Song, Yizhen Jia, C. Hua, Miao Zhou
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引用次数: 0

Abstract

Remarkable progress has been made in using electric circuits as a powerful platform to realize a plethora of exotic topological quantum states, even of higher orders and/or dimensions. So far the proposed circuits are restricted to a single-orbital tight-binding model with different lattices. Here, we introduce the concept of a multi-orbital topolectrical circuit and construct practical LC circuits to demonstrate its superiorities. As a proof of concept, we assemble two sets of inductors in one plaquette to simulate a (px, py )-orbital model within a two-dimensional hexagonal lattice. In the presence of spin–orbit coupling, as generated by mixing voltage degrees of freedom, a quantum spin Hall (QSH) state emerges with spin-resolved edge modes propagating along the boundary in the time domain. Implementation of negative impedance converters (NICs) with nonreciprocal links transforms the circuit into a quantum anomalous Hall (QAH) state. Remarkably, we demonstrate that QSH/QAH states can be reversibly switched by tuning the resistance of NIC, and an experimental observable-edge distance ratio is proposed to facilitate the phase transition detection. This work provides an exciting playground for exploring multi-orbital physics in topolectrical circuits, paving the way for future applications in nanoelectronics, telecommunications, signal processing and quantum computing.
拓扑量子态的多轨道拓扑电路
利用电路作为强大的平台来实现大量奇异的拓扑量子态,甚至是更高阶和/或更高维的拓扑量子状态,已经取得了显著的进展。到目前为止,所提出的电路仅限于具有不同晶格的单个轨道紧束缚模型。在这里,我们介绍了多轨道拓扑电路的概念,并构造了实用的LC电路来展示它的优势。作为概念验证,我们将两组电感器组装在一个正方形中,以模拟二维六边形晶格中的(px,py)轨道模型。在存在由混合电压自由度产生的自旋-轨道耦合的情况下,量子自旋霍尔(QSH)态出现,自旋分辨的边缘模式在时域中沿边界传播。具有非互易链路的负阻抗转换器(NIC)的实现将电路转换为量子反常霍尔(QAH)状态。值得注意的是,我们证明了通过调节NIC的电阻可以可逆地切换QSH/QAH状态,并提出了实验可观察的边缘距离比来促进相变检测。这项工作为探索拓扑电路中的多轨道物理提供了一个令人兴奋的平台,为未来在纳米电子学、电信、信号处理和量子计算中的应用铺平了道路。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Nano Futures
Nano Futures Chemistry-General Chemistry
CiteScore
4.30
自引率
0.00%
发文量
35
期刊介绍: Nano Futures mission is to reflect the diverse and multidisciplinary field of nanoscience and nanotechnology that now brings together researchers from across physics, chemistry, biomedicine, materials science, engineering and industry.
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