ATK教程：石墨烯纳米带的透射谱计算.pdfVIP

10/15/15, 9:20 AMTransmission spectrum of a graphene nanoribbon with a distortion — QuantumWise 0.1.1 documentation Page 1 of 12/tutorials/transmission_distorted_gnr.html Docs ? Tutorials ? 1D nanostructures ? Transmission spectrum of a graphene nanoribbon with a distortion Transmission spectrum of a graphene nanoribbon with a distortion The device system In this tutorial, you will study the electron transport properties of a graphene nanoribbon with a distortion. You will be introduced to device geometries and different analysis tools for investigating the electronic transport properties of devices. Start by opening VNL. In the VNL top menu select Projects , and open the ExampleProject. The example project has a number of result files, in the following you will be examining the “nanoribbon_ivcurve.nc” result file. Expand the nanoribbon_ivcurve entry and select the device configuration (object gID000). In the right panel bar Viewer This will display the configuration in a 3D graphics window. The structure is a so called device geometry. It consists of three parts: the left electrode, the central region, and the right electrode. The left and right electrodes are semi-infinite periodic in the negative/positive Z direction, the transport direction. The electrodes may differ from one another, e.g. be composed of different materials or have different structures. However, they must be periodic, and they must have a common unit cell in the X/Y plane. For more details about how to set up a device configuration, go to the tutorial Building a graphene nanoribbon device. The central region consists of extension copies of the two electrodes and a scattering region in between, as depicted in the figure below. Here, the vectors A, B, and C span the electrode. For device simulations, the C-vector must always be parallel to the Z axis, and the AB-plane must be orthogonal to the Z axis. 10/15/15, 9:20 AMTransmission spectrum of a graphene nanoribbon with a distortion — QuantumWis