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Physics of moiré materials

Date : Thursday, April 8th, 2021 10:30 - 12:00 Place : On Zoom: https://sites.google.com/view/cevis2020/registration (We will send the zoom link to the registered participants) Lecturer : Mikito Koshino Affiliation : Osaka University Committee Chair : Masaki Oshikawa (ex. 63275)
e-mail: oshikawa-jimu@issp.u-tokyo.ac.jp

When 2D materials having different periodicities are overlaid with each other, the moiré interference pattern caused by the lattice mismatch always leads to unusual electronic properties. For instance, the twisted bilayer graphene exhibits dramatic phenomena such as the flat band formation and emergent superconductivity. In this talk, I present our recent theoretical works on moiré systems and their novel physical properties, together with recent experimental results. Using a general theoretical framework to treat incommensurate systems,I describe various exotic phenomena such as flat-band formation at the magic angle, graphene quasicrystal at 30 degree, and twist-dependent spintronics in graphene/TMDC system. I also discuss about the phonon properties of the moire materials,where I show that the original acoustic phonons of the single-layer material are completely mixed up and reconstructed into effective vibration modes of the moiré pattern, leading to a significant enhancement of the electron-phonon coupling.

Chair: Eun-Gook Moon

This event is jointly organized by the Korea Institute for Advanced Study and the University of Tokyo. “Correlated Electrons Virtual International Seminars (CEVIS)” https://sites.google.com/view/cevis2020/home

(Published on: Monday April 5th, 2021)