Robust and tunable Weyl phases by coherent infrared phonons in ZrTe5
Robust and tunable Weyl phases by coherent infrared phonons in ZrTe5
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DOI：
10.1038/s41524-022-00800-z
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发表时间：
2021-10
影响因子：
9.7
通讯作者：
N. Aryal;X. Jin;Qiang Li;Mengkun Liu;A. Tsvelik;W. Yin
中科院分区：
文献类型：
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作者：
N. Aryal;X. Jin;Qiang Li;Mengkun Liu;A. Tsvelik;W. Yin
各种量子材料的结构和电子特性的超快控制最近引起了人们的极大兴趣。特别是，不同拓扑相之间的光诱导切换被认为是实现量子计算机的有前途的途径。在这里，我们使用第一性原理和有效的哈密顿方法来证明，在ZrTe5中，与所有三种类型的区中心红外光学声子模式相对应的晶格畸变可以驱动系统从拓扑绝缘体到Weyl半金属。由此获得的外尔相是稳健的、高度可调的，并且由于外尔点接近费米能级且缺乏其他载流子，因此是最干净的外尔相之一。我们还发现，由动态反演对称性破缺引起的贝里曲率偶极矩会引起各种随声子模式振幅振荡的非线性效应。这些非线性效应提供了一种超快开关，用于控制 Weyltronics 启用的量子系统。
Ultrafast control of structural and electronic properties of various quantum materials has recently sparked great interest. In particular, photoinduced switching between distinct topological phases has been considered a promising route to realize quantum computers. Here we use first-principles and effective Hamiltonian methods to show that in ZrTe5, lattice distortions corresponding to all three types of zone-center infrared optical phonon modes can drive the system from a topological insulator to a Weyl semimetal. Thus achieved Weyl phases are robust, highly tunable, and one of the cleanest due to the proximity of the Weyl points to the Fermi level and a lack of other carriers. We also find that Berry curvature dipole moment, induced by the dynamical inversion symmetry breaking, gives rise to various nonlinear effects that oscillate with the amplitude of the phonon modes. These nonlinear effects present an ultrafast switch for controlling the Weyltronics-enabled quantum system.