论文标题
Jackiw-Rebbi共振的签名在拓扑约瑟夫森与磁岛的拓扑电导中
Signatures of Jackiw-Rebbi resonance in the thermal conductance of topological Josephson junctions with magnetic islands
论文作者
论文摘要
具有嵌入式磁性域的二维拓扑绝缘子中的约瑟夫森连接可以容纳许多拓扑阶段，尤其是Jackiw-Rebbi Solitons和Majoraana零模式。这些不同的非平凡阶段出现在此类连接中，用于多域磁岛，显示了丰富的多间隙结构。这些系统中与超导性和磁性之间的相互作用相关的特征很容易看出Andreev Spectrum的行为和随之而来的DC Josephson效应。取而代之的是，导热电导对磁岛的结和域结构的性质非常敏感。在拓扑约瑟夫森连接的情况下，我们对这些特性进行了详细的分析，该特性与单个和两域磁岛。托管孤子磁模式的构型导致导热电导相对于热量子的特殊行为，其特征是负斜率作为温度的函数，就在超导临界温度上方。在低温下，这些连接还显示了导热电导的行为中的特征相干模式，作为约瑟夫森相位偏置的函数以及域的磁化之间的角度。
Josephson junctions in two-dimensional topological insulators with embedded magnetic domains can host a number of topological phases, in particular, Jackiw-Rebbi solitons and Majorana zero modes. These different non-trivial phases appear in such junctions for multiple-domain magnetic islands, showing a rich multi-gap structure. Features related to the interplay between superconductivity and magnetism in these systems cannot be easily discerned looking at behavior of the Andreev spectrum and the concomitant dc Josephson effect. Instead, the thermal conductance is very sensitive to the nature of the junction and the domain structure of the magnetic island. We present a detailed analysis of these properties in the case of a topological Josephson junction with a single and two-domain magnetic island. Configurations hosting soliton magnetic modes lead to a peculiar behavior of the thermal conductance relative to the thermal quantum, characterized by a negative slope as a function of the temperature, just above the superconducting critical temperature. At low temperatures, these junctions also show characteristic coherence patters in the behavior of the thermal conductance as function of the Josephson phase bias and the angle between the magnetizations of the domains.
