كتاب
Magnetic Properties of Large-Scale Nanostructured Graphene Systems
| العنوان: | Magnetic Properties of Large-Scale Nanostructured Graphene Systems |
|---|---|
| المؤلفون: | Gregersen, Søren Schou |
| المصدر: | Gregersen , S S 2017 , Magnetic Properties of Large-Scale Nanostructured Graphene Systems . DTU Nanotech . |
| بيانات النشر: | DTU Nanotech |
| سنة النشر: | 2017 |
| المجموعة: | Technical University of Denmark: DTU Orbit / Danmarks Tekniske Universitet |
| الوصف: | The on-going progress in two-dimensional (2D) materials and nanostructure fabrication motivates the study of altered and combined materials. Graphene—the most studied material of the 2D family—displays unique electronic and spintronic properties. Exceptionally high electron mobilities, that surpass those in conventional materials such as silicon, make graphene a very interesting material for high-speed electronics. Simultaneously, long spin-diffusion lengths and spin-life times makes graphene an eligible spin-transport channel. In this thesis, we explore fundamental features of nanostructured graphene systems using large-scale modeling techniques. Graphene perforations, or antidots, have received substantial interest in the prospect of opening large band gaps in the otherwise gapless graphene. Motivated by recent improvements of fabrication processes, such as forming graphene antidots and layer-by-layer stacking, we consider a hybrid bilayer graphene system: Graphene on graphene antidot lattice (GOAL). These systems can be engineered to select attractive features from either bilayer and monolayer graphene. For a certain set of optimized geometries, we obtain linearly dispersing bands with a high corresponding mobility, resembling that of monolayer graphene. Nevertheless, these linearly dispersive GOALs can be made gapped by breaking layer symmetry, using e.g. perpendicular electric fields. In the area of graphene spintronics, the formation of magnetic moments is predicted as the result of breaking the graphene sublattice symmetry. We take advantage of this, and explore the fundamental features of zigzag-edged triangular graphene antidots (zz-TGAs). Their specific edge configurations give rise to highly desirable spin-filtering and spin-splitting transport features. The mechanisms behind these functionalities are studied in detail in lattices, devices, and finally in disordered systems of experimentally feasible scale. We demonstrate that superlattices of triangular antidots exhibit large bands gaps, induced by ... |
| نوع الوثيقة: | book |
| وصف الملف: | application/pdf |
| اللغة: | English |
| الإتاحة: | https://orbit.dtu.dk/en/publications/69b112e4-02ba-4599-ab4a-772cab6a0a8dTest https://backend.orbit.dtu.dk/ws/files/133702673/Untitled.pdfTest |
| حقوق: | info:eu-repo/semantics/openAccess |
| رقم الانضمام: | edsbas.34DF63D8 |
| قاعدة البيانات: | BASE |
| الوصف غير متاح. |