论文标题
二维电子气体中的异常量化高原与栅极限制
Anomalous quantized plateaus in two-dimensional electron gas with gate confinement
论文作者
论文摘要
量子信息可以由分数量子厅（FQH）状态的拓扑保护边缘编码。多年来，对FQH边缘的调查是希望搜索和利用非亚伯统计的调查一直是一个集中的挑战。操纵边缘，例如将边缘彼此接近或在空间上分离边缘，这是此类研究的常见和重要步骤。限制区域中的FQH边缘结构通常被预设为在分析实验结果中的开放区域中的FQH边缘结构相同，但是它们是否保持额外的限制是否保持不变是晦涩的。在这项工作中，我们在一个密闭的单层二维电子气体（2DEG）中介绍了一系列意外的高原，它们在异常分数（例如9/4、17/11、16/13和报告的3/2）上进行了量化。我们通过假设在受限区域中假设更大的填充因子来解释所有高原。我们的发现丰富了对狭窄区域中边缘状态的理解和栅极操纵的应用，这对于具有量子点接触和干涉仪的实验至关重要。
Quantum information can be coded by the topologically protected edges of fractional quantum Hall (FQH) states. Investigation on FQH edges in the hope of searching and utilizing non-Abelian statistics has been a focused challenge for years. Manipulating the edges, e.g. to bring edges close to each other or to separate edges spatially, is a common and essential step for such studies. The FQH edge structures in a confined region are typically presupposed to be the same as that in the open region in analysis of experimental results, but whether they remain unchanged with extra confinement is obscure. In this work, we present a series of unexpected plateaus in a confined single-layer two-dimensional electron gas (2DEG), which are quantized at anomalous fractions such as 9/4, 17/11, 16/13 and the reported 3/2. We explain all the plateaus by assuming surprisingly larger filling factors in the confined region. Our findings enrich the understanding of edge states in the confined region and in the applications of gate manipulation, which is crucial for the experiments with quantum point contact and interferometer.
