摘要：Confined low dimensional charges with high density such as two-dimensional electron gas(2 DEG)at interfaces and charged domain walls in ferroelectrics show great potential to serve as functional elements in future ***,stabilization and control of low dimensional charges is challenging,as they are usually subject to enormous depolarization ***,we demonstrate a method to fabricate tunable charged interfaces with~77°,86°and 94°head-to-head polarization configurations in multiferroic Bi Fe O_(3) thin films by grain boundary *** adjacent grains are cohesively bonded and the boundary is about 1 nm in width and devoid of any amorphous ***,the polarization remains almost unchanged near the grain boundaries,indicating the polarization charges are well compensated,i.e.,there should be two-dimensional charge gas confined at grain *** the tilt angle of the grain boundaries enables tuning the angle of polarization configurations from 71°to 109°,which in turn allows the control of charge density at the grain *** general and feasible method opens new doors for the application of charged interfaces in next generation nanoelectronics.

摘要：Si基光子学是近年来在半导体光电子学和纳米材料科学领域中迅速发展起来的一个新型分支学科，旨在研究各类Si基低维材料的发光特性。各种Si基光子器件的设计与制作，并进而实现用于现代光通信技术的全Si光电子集成电路。预计在未来10年内，随着Si基纳米材料发光效率的提高，器件制备技术的进步和光电子集成工艺的成熟，Si基光子学的研究将出现重大突破性进展，并很有可能引发一场新的信息技术革命。本文着重介绍了用于Si基光电集成的光子学材料、器件与工艺在近3～5年内所取得的研究进展，并预测了它们的未来发展趋势。