| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Functional Nanomaterials
|
| Presentation Title |
Novel Properties of Two-Dimensional Weyl States Achieved by Thickness-Dependent Topological Phase Transition in Bi0.96Sb0.04 Thin Films and Applications |
| Author(s) |
Suk-Ho Choi |
| On-Site Speaker (Planned) |
Suk-Ho Choi |
| Abstract Scope |
The intriguing electronic structure of topological semimetals (TSMs), representing a novel class of condensed matter, is of fundamental interest because of their exotic quantum nature and potential for next-generation device applications. In this talk, I discuss our recent findings on a Dirac- to Weyl-semimetal (WSM) phase transition in Dirac semimetal (DSM) Bi0.96Sb0.04 single crystals by Au-ion implantation and 2D WSM states achieved by a thickness-dependent topological phase transition of Bi0.96Sb0.04 thin films. The 2D Weyl states show novel transport of charge carriers such as temperature- and thickness-dependent metal-insulator transition behaviors, which are discussed based on the theoretical calculations. Photogalvanic effect of the inversion-symmetry-broken 2D WSM states is also studied for their possible energy harvesting applications. Low-dimensional materials such as 0D graphene quantum dots and 2D transition metal dichalcogenides are employed to fabricate 2D- and 3D-TSM (i.e., 2D WSM and 3D DSM)-based mixed-dimensional heterostructures, useful for optoelectronic device applications. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Phase Transformations, Nanotechnology, Thin Films and Interfaces |