超越均匀变形的应变电子学
Straintronics beyond homogeneous deformation
摘要：
我们提出了一个连续体理论的石墨烯治疗在平等的基础上均匀柯西-玻恩（CB）变形，以及与两个子晶格的微观自由度。虽然我们的理论恢复了所有现存的结果从均匀连续统理论，Dirac-Weyl方程被发现是由新的伪规范和手征领域从根本上不同于那些结果从均匀变形。我们阐明了三个显著的电子学结果：（i）非CB形变允许谷极化电荷沿任意长距离的输运，例如沿设计的脊;（ii）非CB形变不需要产生近似均匀的磁场所需的三轴形变;最后（iii）在\emph{ab-initio}计算中看到的一维晶格弛豫效应的消失被解释为CB和非-CB变形。
英文摘要：
We present a continuum theory of graphene treating on an equal footing both homogeneous Cauchy-Born (CB) deformation, as well as the microscopic degrees of freedom associated with the two sublattices. While our theory recovers all extant results from homogeneous continuum theory, the Dirac-Weyl equation is found to be augmented by new pseudo-gauge and chiral fields fundamentally different from those that result from homogeneous deformation. We elucidate three striking electronic consequences: (i) non-CB deformations allow for the transport of valley polarized charge over arbitrarily long distances e.g. along a designed ridge; (ii) the triaxial deformations required to generate an approximately uniform magnetic field are unnecessary with non-CB deformation; and finally (iii) the vanishing of the effects of a one dimensional corrugation seen in \emph{ab-initio} calculation upon lattice relaxation are explained as a compensation of CB and non-CB deformation.
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