三角形kagome格点上自旋1费米子和Dirac费米子的共存
Coexistence of spin-1 fermion and Dirac fermion on the triangular kagome lattice
摘要：
由于与高能物理中的庞加莱对称性相比，对称性约束较小，因此晶格系统中可以出现超出Dirac-Weyl-Majorana分类的准粒子激发。特别是，具有整数自旋的费米子可以出现在各种晶格中。在这里，我们表明，二维自旋-1费米子可以共存的狄拉克费米子在三角形kagome晶格（TKL）。我们推导出一个四带的有效模型，主机两种类型的费米子。有效模型可以用来研究自旋为1和自旋为1/2的费米子之间的相互作用。作为一个例子，使用这个模型，我们表明，自旋非守恒克莱因隧穿可以发生在TKL，它的透射系数$T=1$的正常入射。我们的发现为研究晶格系统中不同类型费米子之间的相互作用和相互作用铺平了道路。
英文摘要：
Quasiparticle excitations beyond Dirac-Weyl-Majorana classification can appear in lattice systems due to the less symmetry constraint compared with Poincaré symmetry in high energy physics. In particular, fermions with an integer spin can appear in a variety of lattices. Here, we show that two-dimensional spin-1 fermion may coexist with Dirac fermions in the triangular kagome lattice (TKL). We derive a four-band effective model that hosts both types of fermions. The effective model can be used to study the interplay between spin-1 and spin-1/2 fermions. As an example, using this model we show that spin-nonconserving Klein tunneling can occur in the TKL, which has the transmission coefficient $T=1$ for normal incidence. Our findings pave a way to the study of the interaction and interplay between different types of fermions in lattice systems.
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