The energy bandgap is an intrinsic character of semiconductors, which largely determines their properties. The ability to continuously and reversibly tune the bandgap of a single device during real time operation is o...The energy bandgap is an intrinsic character of semiconductors, which largely determines their properties. The ability to continuously and reversibly tune the bandgap of a single device during real time operation is of great importance not only to device physics but also to technological applications. Here we demonstrate a widely tunable bandgap of few-layer black phosphorus （BP） by the application of vertical electric field in dual-gated BP field-effect transistors. A total bandgap reduction of 124 meV is observed when the electrical displacement field is increased from 0.10 V/nm to 0.83 V/nm. Our results suggest appealing potential for few-layer BP as a tunable bandgap material in infrared optoelectronies, thermoelectric power generation and thermal imaging.展开更多
The facial three-dimensional stereophotography technology is based on digital stereogrammetry technology. According to different light sources, it can be divided into three kinds, active, passive and hybrid. This syst...The facial three-dimensional stereophotography technology is based on digital stereogrammetry technology. According to different light sources, it can be divided into three kinds, active, passive and hybrid. This system can show characteristics of height, width and depth of facial soft tissues . It has the advantages of high reproducibility, low precision, high reliability, fast image acquisition, noninvasiveness and repeatability. The image can be used for facial anthropometric measurement , as well as establishing a three-dimensional facial model for surgical simulation and analysis . It can also record facial features of patients which can be used for follow-up.展开更多
基金Supported by the National Basic Research Program of China under Grant Nos 2013CB921900 and 2014CB920900the National Natural Science Foundation of China under Grant No 11374021)(S.Yan,Z.Xie,J.-H,Chen)+1 种基金support from the Elemental Strategy Initiative conducted by the MEXT,Japana Grant-in-Aid for Scientific Research on Innovative Areas"Science of Atomic Layers"from JSPS
文摘The energy bandgap is an intrinsic character of semiconductors, which largely determines their properties. The ability to continuously and reversibly tune the bandgap of a single device during real time operation is of great importance not only to device physics but also to technological applications. Here we demonstrate a widely tunable bandgap of few-layer black phosphorus （BP） by the application of vertical electric field in dual-gated BP field-effect transistors. A total bandgap reduction of 124 meV is observed when the electrical displacement field is increased from 0.10 V/nm to 0.83 V/nm. Our results suggest appealing potential for few-layer BP as a tunable bandgap material in infrared optoelectronies, thermoelectric power generation and thermal imaging.
文摘The facial three-dimensional stereophotography technology is based on digital stereogrammetry technology. According to different light sources, it can be divided into three kinds, active, passive and hybrid. This system can show characteristics of height, width and depth of facial soft tissues . It has the advantages of high reproducibility, low precision, high reliability, fast image acquisition, noninvasiveness and repeatability. The image can be used for facial anthropometric measurement , as well as establishing a three-dimensional facial model for surgical simulation and analysis . It can also record facial features of patients which can be used for follow-up.
