论文标题
通过局部粒子损失的晶格进行对称保护的传输
Symmetry-protected transport through a lattice with a local particle loss
论文作者
论文摘要
我们通过连接到两端的自由铁储层的耦合位点的链链进行粒子传输，并遭受局部粒子损失。运输的特征是使用开放量子系统的Keldysh形式主义计算稳态中的电导率和颗粒密度。除了降低电导外，我们发现运输可能（几乎）不受晶格中某些化学电位值的损失的影响。我们表明，这种“受保护”的运输是由单粒子本征态的空间对称性产生的。在有限的电压下，密度曲线在有损位点下降，与非焊接运输的发作有关。
We study particle transport through a chain of coupled sites connected to free-fermion reservoirs at both ends, subjected to a local particle loss. The transport is characterized by calculating the conductance and particle density in the steady state using the Keldysh formalism for open quantum systems. Besides a reduction of conductance, we find that transport can remain (almost) unaffected by the loss for certain values of the chemical potential in the lattice. We show that this "protected" transport results from the spatial symmetry of single-particle eigenstates. At a finite voltage, the density profile develops a drop at the lossy site, connected to the onset of non-ballistic transport.
