Paul-Drude-Institut für Festkörperelektronik, Hausvogteiplatz 5-7, 10117 Berlin, Germany.
Nano Lett. 2011 Jun 8;11(6):2486-9. doi: 10.1021/nl2009444. Epub 2011 May 17.
Scanning tunneling microscopy (STM) at 5 K reveals that native atoms in the surface layer of a semiconductor crystal become bistable in vertical height when a nanostructure is assembled nearby. The binary switching of surface atoms, driven by the STM tip, changes their charge state. Coupling is facilitated by assembling adatom chains, allowing us to explore the emergence of complex multiple switching. Density-functional theory calculations rationalize the observations and a lattice-gas model predicts the cooperative behavior from first principles.
在 5 K 下进行扫描隧道显微镜（STM）研究表明，当在附近组装纳米结构时，半导体晶体表面层中的本征原子在垂直高度上变为双稳态。由 STM 尖端驱动的表面原子的二进制切换会改变它们的电荷状态。通过组装 adatom 链来促进耦合，从而使我们能够探索复杂的多重切换的出现。密度泛函理论计算合理化了这些观察结果，晶格气体模型从第一性原理预测了协同行为。
