论文标题
Moir {é} - 类似于超级晶格产生的van Hove奇异性，cuo $ _2 $双层
Moir{é}-like superlattice generated van Hove singularities in strained CuO$_2$ double layer
论文作者
论文摘要
众所周知，双层bi $ _2 $ sr $ _2 $ cacu $ _2 $ o $ _ {8+y} $（bscco）cuprate超导体表现出一维（1D）infmensurate informentrate superlattice（is），对电子结构的影响仍然很高。在最近将兴趣从不足的兴趣转变为BSCCO中的最佳和过度阶段之后，通过增加掺杂$ x $的孔，受氧气间隙浓度$ y $控制，在这里，我们重点介绍了状态（DOS）的密度（DOS）峰的多重分散，并出现了高阶van Hove sickulinities（vhs）的峰值（vhs）应e峰值。众所周知，一维不相差波矢量$ \ textbf {q} =ε\ textbf {b} $（其中$ \ \ \ \ textbf {b} $是正交晶格的互惠晶格矢量，由范围内的范围$ 0.25 $ 0.25 $ 0.21 $ 0.21 $ 0.21 $ - $ 0.209 $ - $ 0.25 $ in BI $ _2 $ _2 $ _2 $ ca $ _ {1 -x} $ y $ _x $ _x $ cu $ _2 $ _2 $ o $ $ _ {8+y} $（bscyco）。这项工作报告了由于1D不兑换的超晶格与波动矢量$ 36>η> 43 $的一维超增量超增压超过$ε= 9/η$，因此对VHS的复杂模式进行了理论计算。由于Moir {é}晶格在紧张的扭曲的双层石墨烯中，因此在不匹配的CUO $ _2 $双层中与VHS的高阶VHS的相似性与VHS的相似性。这使得不匹配的CUO $ _2 $ BiLayer对于构造具有调谐物理特征的量子设备非常有前途。
While it is known that the double-layer Bi$_2$Sr$_2$CaCu$_2$O$_{8+y}$ (BSCCO) cuprate superconductor exhibits a one-dimensional (1D) incommensurate superlattice (IS), the effect of IS on the electronic structure remains elusive. Following the recent shift of the interest from underdoped to optimum and overdoped phase in BSCCO by increasing the hole doping $x$, controlled by the oxygen interstitials concentration $y$, here we focus on the multiple splitting of the density of states (DOS) peaks and emergence of higher order van Hove singularities (VHS) due to the 1D incommensurate superlattice. It is known that 1D incommensurate wave vector $\textbf{q} = ε\textbf{b}$ (where $\textbf{b}$ is the reciprocal lattice vector of the orthorhombic lattice) is controlled by the misfit strain between different atomic layers in the range $0.209$ - $0.215$ in BSCCO and in the range $0.209$ - $0.25$ in Bi$_2$Sr$_2$Ca$_{1-x}$Y$_x$Cu$_2$O$_{8+y}$ (BSCYCO). This work reports the theoretical calculation of a complex pattern of VHS due to the 1D incommensurate superlattice with large 1D quasi-commensurate supercells with the wave vector $ε=9/η$ in the range $36 > η> 43$. The similarity of the complex VHS splitting and appearing of higher order VHS in a mismatched CuO$_2$ bilayer with VHS due to the moir{é} lattice in strained twisted bilayer graphene is discussed. This makes mismatched CuO$_2$ bilayer quite promising for constructing quantum devices with tuned physical characteristics.
