论文标题
在螺旋边缘状态形成的热偏见的短约瑟夫森连接处的相位依赖电荷和热电流
Phase-dependent charge and heat current in thermally biased short Josephson junctions formed at helical edge states
论文作者
论文摘要
我们探索在短的约瑟夫森连接处的相关电荷和热电流，其在相反端的两个正常金属区域在二维拓扑绝缘子（TIS）的螺旋边缘状态下形成。对于所有有限阶段，除$ ϕ \！= \！n ϕ_0 $外，传输光谱中的零能量围绕零能量出现，其中$ n $是半零件，$ ϕ_0 $（$ =2π$）是磁量量子。相诱导的不对称性在通过热偏置连接诱导电荷和热电流中起关键作用。但是，当前幅度对连接的大小敏感。我们表明，在短的约瑟夫森连接处，当受温度梯度的约束时，电荷电流在相时显示出奇数对称。它表明零能量周围的相位不对称不足以诱导连接处的耗散热电电流。这与文献中所示的长约瑟夫森结的行为相反。相位可调的热电流是通过相差，基础温度和系统尺寸设定的振幅获得的。
We explore the phase-dependent charge and heat current in the short Josephson junctions with two normal metal regions attached at opposite ends, formed at helical edge states of two-dimensional topological insulators (TIs). For all finite phases, an asymmetry appears around the zero energy in the transmission spectra except for $ϕ\!=\!nϕ_0$, where $n$ is a half-integer and $ϕ_0$ ($=2π$) is the flux quantum. The phase-induced asymmetry plays a key role in inducing charge and heat current through the thermally biased junction. However, the current amplitudes are sensitive to the size of the junction. We show that in the short Josephson junction when subject to a temperature gradient, the charge current shows an odd-symmetry in phase. It indicates that the phase-tunable asymmetry around the zero-energy is not sufficient to induce a dissipative thermoelectric current in the junction. This is in contrast to the behavior of long Josephson junction as shown in the literature. The phase-tunable heat currents are obtained with amplitudes set by the phase difference, base temperature, and system size.
