Nodal arc of disordered Dirac fermions and non-Hermitian band theory
Nodal arc of disordered Dirac fermions and non-Hermitian band theory
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DOI：
10.1103/physrevb.99.201107
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发表时间：
2018-02
影响因子：
3.7
通讯作者：
M. Papaj;H. Isobe;L. Fu
中科院分区：
文献类型：
--
作者：
M. Papaj;H. Isobe;L. Fu
我们证明了二维Dirac费米子系统一般表现为无序诱导的节弧代替节点和倾斜的Dirac锥，只要Dirac费米子的两个分量对应于两个不同的对称无关的轨道。这一结果在我们引入的无序狄拉克模型中使用重整化群分析得到了明确的证明，其中无序势在两个轨道上的作用不同。数值模拟和自洽Born近似计算表明，这将使系统进入一个新的强无序状态。
We show that Dirac fermion systems in two dimensions generally exhibit disorder-induced nodal arc replacing the nodal point and tilted Dirac cone, provided that the two components of the Dirac fermion correspond to two distinct orbitals unrelated by symmetry. This result is explicitly demonstrated using renormalization group analysis in a disordered Dirac model that we introduce, where the disorder potential acts differently on the two orbitals. As we show by numerical simulations and self-consistent Born approximation calculation, this drives the system into a new strongly disordered phase.