Three-dimensional topological insulator in a magnetic field: chiral side surface states and quantized Hall conductance
Three-dimensional topological insulator in a magnetic field: chiral side surface states and quantized Hall conductance
复制标题
DOI：
10.1088/0953-8984/24/1/015004
复制
发表时间：
2011-03
期刊：
影响因子：
--
通讯作者：
Yan-Yang Zhang;Xiangrong Wang;Xiangrong Wang;Xin-cheng Xie
中科院分区：
文献类型：
--
作者：
Yan-Yang Zhang;Xiangrong Wang;Xiangrong Wang;Xin-cheng Xie
三维拓扑绝缘体表面态的低能激发可以用狄拉克费米子来描述。利用紧束缚模型，研究了均匀磁场中表面态的输运性质。研究发现，平行于磁场的手征表面态是量子化霍尔电导乘以狄拉克锥数的原因。由于表面态的二维性质，QH电导对杂质散射的鲁棒性由狄拉克锥数的奇性和均匀性决定。提出了一种输运测量的实验装置。
Low energy excitation of surface states of a three-dimensional topological insulator (3DTI) can be described by Dirac fermions. By using a tight-binding model, the transport properties of the surface states in a uniform magnetic field are investigated. It is found that chiral surface states parallel to the magnetic field are responsible for the quantized Hall (QH) conductance multiplied by the number of Dirac cones. Due to the two-dimensional nature of the surface states, the robustness of the QH conductance against impurity scattering is determined by the oddness and evenness of the Dirac cone number. An experimental setup for transport measurement is proposed.