标题： 扭曲二维材料缺陷发射中的巨大反常斯塔克效应 显示英文标题

标题： Colossal anomalous Stark shift in defect emission of undulated 2D materials

摘要： 我们报告了一种引人注目的新物理现象，即在波纹状二维（2D）材料中，镜像对称性破缺会引起缺陷发射的巨斯塔克位移，这种现象在没有外部电场F的情况下发生，称为异常斯塔克效应。 对弯曲二维hBN中多种缺陷的第一性原理计算揭示了这一异常效应的基本物理原因，并表明这是由于柔性电极化与缺陷偶极矩之间的强耦合引起的。 这种柔性-偶极相互作用类似于传统斯塔克效应中由于F引起的相互作用，导致像NBVN和CBVN这样的缺陷在$\kappa$= 1/nm时零声子线（ZPL）位移超过500 meV，比典型的斯塔克位移大2到3个数量级。 大的ZPL位移变化随着曲率和弯曲方向而变化，为识别纳米管手性提供了一种方法，并解释了二维材料中单光子发射器波长的大范围变化，对设计纳米机电和光子器件具有额外的启示。 显示英文摘要

摘要： We report a strikingly new physical phenomenon that mirror symmetry breaking in undulated two-dimensional (2D) materials induces a colossal Stark shift in defect emissions, occurring without external electric field F, termed anomalous Stark effect. First-principles calculations of multiple defects in bent 2D hBN uncover the fundamental physical reasonings for this anomalous effect and reveal this arises due to strong coupling between flexoelectric polarization and defect dipole moment. This flexo-dipole interaction, similar to that in traditional Stark effect due to F, results in zero-phonon line (ZPL) shifts >500 meV for defects like NBVN and CBVN at $\kappa$ = 1/nm, exceeding typical Stark shifts by 2-3 orders of magnitude. The large ZPL shifts variations with curvature and bending direction offers a method to identify nanotube chirality and explain the large variability in single photon emitters' wavelength in 2D materials, with additional implications for designing nano-electro-mechanical and photonic devices.