
Computational Study of the inorganic and hybrid functional materials for (spin) electronics and chemical transformations
Allocation
Abstract
1. The combination of spintronics and molecular electronics is an emerging research field due to the possibility of manipulating spin and charge degrees of freedom at the atomic scale. The possibility of controlled spin manipulation makes these magnets attractive for device applications including spindependent electronics and molecular switches.
Crown ether molecules, as the name suggests, are composed of rings of polar COC chains (with H bonds as required to eliminate dangling bonds). A single crown ether molecule is referred to as NcrownM, where N is the total number of C and O atoms and M is the number of ether chains. A monolayer of crown ethers can be viewed as a sheet of graphene into which vacancies and O substitution have been introduced, and prior work suggests that such a structure would exhibit an enhanced ability to incorporate atoms or molecules within the cavity compared to the freestanding molecule and would therefore prove attractive as a host for molecular spintronics devices. The investigation of the crystal, electronic, and magnetic structure of crown ethermolecules and monolayers with TM atoms incorporated into the cavity will be the initial focus of our investigation. Later work could focus on manipulation of the coupling between the dressed crown ethers via empty cavities or interaction with, e.g., a Fe or Ni thin film substrate, with additional quantum control coming from strain and variation of N and M (leading to varying TMO bond lengths and coordination numbers). The dependence of electron correlation, charge transfer, and hybridization on these parameters should lead to interesting and tunable physical phenomena that would be of considerable technological and fundamental interest. The the electronic properties can be obtained using the Dynamical meanfiled approximation (DMFT)
Implemented in RSPt code.
2. Fewlayer black phosphorus (BP) is a novel twodimensional (2D) semiconductor with a number of remarkable properties such as strong anisotropy and pronounced thickness dependence of its electronic characteristics, as well as high current onoff ratios and high carrier mobilities. Consequently, BP is a promising candidate for diverse electronic and optical applications.
It is wellknown that oneparticle DFT often fails to produce accurate band gaps, while more consistent results with respect to the electronic properties can be obtained using the QSGW approximation. However, GW calculations come with their own difficulties due to the dependence on the starting point, selfconsistent Green function, and/or and the model used to obtain W. In this study, we will perform a systematic study on multilayers of BP by quasiparticle selfconsistent GW approach and also the structural deformation by the weak VDW forces. Combing these two factors, we can pave the way of how to produce an accurate band gap of BP, with technical and scientific results that will give insights to many other monolayers.
