| Time：1110914 (Wed.) 14:20~16:20 Speaker：Prof.劉明豪(Ming-Hao Liu) 國立成功大學物理學系/Department of Physics, National Cheng Kung University Title：Quantum Transport Simulations for Graphene Superlattices Abstract：Electrons in graphene behave like massless Dirac fermions due to their energy dispersion linear in momentum, just like photons in vacuum. When a spatially periodic potential that varies in a length scale much longer than the lattice constant of graphene is applied, its conic band structure is strongly modified, forming the so-called miniband structure in the resulting graphene superlattice. Depending on the origin of the underlying periodic potential, there are different types of graphene superlattices, each exhibiting more complicated transport behaviors than simple graphene. This first part of this talk gives an overview of our recent progress on quantum transport simulations for various types of graphene superlattices, including hBN/graphene moiré superlattices [1], capacitance-modulated superlattices [2], and twisted graphene layers [3]. The second part focuses on our latest work toward Bloch oscillations in gate-controlled one-dimensional systems. — [1] S.-C. Chen et al., Communications Physics 3, 71 (2020); R. Kraft et al., Phys. Rev. Lett. 125, 217701 (2020). [2] R. Huber et al., Nano Lett. 21, 8046 (2020). [3] P. Rickhaus et al., Science Advances 6, no. 11, eaay8409 (2020); A. Mrenca-Kolasinska et al., 2D Mater. 9, 025013 (2022). Place：S101, Gongguan Campus, NTNU |
