ZrTe5中红外声子引起的膨胀开费米弧和连通性变化
Expansive Open Fermi Arcs and Connectivity Changes Induced by Infrared Phonons in ZrTe5
摘要：
覆盖大部分表面布里渊区（SBZ）的膨胀开费米弧对于许多拓扑现象的检测和控制是期望的，但到目前为止仅报道了Kramers-Weyl点，或非常规手性费米子，钉扎在手性材料中的时间反转不变动量。利用第一性原理能带结构计算，我们发现在BZ中心附近的手征度为+1/-1的常规Weyl点，在（001）面上投影时，也可以形成跨越SBZ边界的扩展开放费米弧，占据SBZ的大部分.我们揭示了这种膨胀的开放费米弧是从拓扑表面态演化而来的，这些拓扑表面态连接了拓扑绝缘体相的（001）表面上的多个表面狄拉克点，而没有晶格畸变。此外，我们发现，诱导开放费米弧的连通性可以改变的晶格畸变的大小，这种红外声子模式。因此，我们建议，使用相干光学声子调制晶格参数可以提供诱导新的拓扑特征，包括扩展开放费米弧和动态控制费米弧连接在ZrTe 5。
英文摘要：
Expansive open Fermi arcs covering most of the surface Brillouin zone (SBZ) are desirable for detection and control of many topological phenomena, but so far has been only reported for Kramers-Weyl points, or unconventional chiral fermions, pinned at time-reversal invariant momentum in chiral materials. Here using first-principles band structure calculations, we show that for conventional Weyl points in ZrTe5 with the chirality of +1/-1 near the BZ center at general momentum induced by one of the infrared phonons, the second lowest B1u mode for breaking inversion symmetry, they can also form expansive open Fermi arcs across the SBZ boundary to occupy most of the SBZ when projected on (001) surface. We reveal that such expansive open Fermi arcs are evolved from the topological surface states that connect multiple surface Dirac points on the (001) surface of the topological insulator phases without lattice distortion in ZrTe5. Furthermore, we find that the connectivity of the induced open Fermi arcs can be changed by the magnitude of the lattice distortion of this infrared phonon mode. Thus, we propose that using coherent optical phonon to modulate lattice parameters can offer ways to induce novel topological features including expansive open Fermi arcs and dynamically control Fermi arcs connectivity in ZrTe5.
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