论文标题
Mos $ {\ BF _2} $ MOS $ MONOLAYERS中的Valley Spin-soustic共振
Valley spin-acoustic resonance in MoS${\bf _2}$ monolayers
论文作者
论文摘要
单层MOS $ _2 $的频带结构由旋转式子带组成，这是由于反转对称性破裂和强旋转轨道耦合的相互存在。在传统带中，自旋 - 瓦利耦合子带在有限的动量上相互交叉，并且它们是山谷定位。当暴露于表面声波时，新出现的应变诱导的有效磁场会导致子带交叉点附近的旋转裂片子带之间的自旋转变，从而导致旋转声音共振和声音电流的出现。外部磁场破坏了山谷的变性，从而导致山谷选择性分裂在表面声波吸收和声学电流中旋转声音共振。
The band structure of a monolayer MoS$_2$ comprises of spin-split subbands, owing to the mutual presence of broken inversion symmetry and strong spin-orbit coupling. In the conduction band, spin-valley coupled subbands cross each other at finite momenta, and they are valley-degenerate. When exposed to surface acoustic waves, the emerging strain-induced effective magnetic field can give rise to spin-flip transitions between the spin-split subbands in the vicinity of subbands crossing point, resulting in the emergence of a spin-acoustic resonance and the acoustoelectric current. An external magnetic field breaks the valley degeneracy resulting in the valley-selective splitting of spin-acoustic resonances both in surface acoustic wave absorption and acoustoelectric current.
