2026/06/25(Thu) 14:00 -16:00 五樓第一會議室 5F, 1st Meeting Room
Title
Creating Topological Quantum States by Rolling Up Graphene: Geometrically Tunable Positive Magnetoconductance in Carbon Nanoscrolls
Speaker
張景皓 (國立成功大學物理學系) Prof. Ching-Hao Chang (Department of Physics, National Cheng Kung University)Abstract
Nanoscrolls, radial superlattices formed by rolling up two-dimensional nanomembranes, exhibit electronic and magnetotransport properties distinct from those of their flat counterparts. Using theoretical modeling, we predict that carbon nanoscrolls host topological valley states that give rise to a remarkable positive magnetoconductance under a longitudinal magnetic field [1,2]. We further predict that the conductance can be precisely enhanced N times by rolling up graphene into an N-turn nanoscroll and applying a longitudinal magnetic field. This tunable positive magnetoconductance stems from the topological winding number which is activated in a carbon nanoscroll with magnetic flux and its maximum value purely increases with the scroll winding number (the number of turns) [3,4]. By combining material geometry and topology, carbon nanoscrolls offer a versatile platform for creating, tailoring, and designing topological quantum states in rolled-up graphene-based materials.
Language
演講語言 (Language): in English