05/21 (목) 전문가초청특강은 건국대학교 박진홍 교수님을 모시고 진행합니다.

관심있는 분들의 많은 참석 부탁드립니다.

ㅁ주제:  Flat Bands and Emergent Physics in Moiré Materials

ㅁ일시: 05/21 (목) 16:00

ㅁ장소: 제2종합연구동 83188호

ㅁ약력: 

ㅁ초록:

 Moiré materials have emerged as a versatile platform for engineering electronic band structures and exploring correlated quantum phenomena. By twisting or stacking atomically thin materials, one can create long-wavelength moiré patterns that strongly modify electron motion, leading to flat bands, magnetism, superconductivity, and other interaction-driven states. These systems are therefore attracting broad interest as a platform for designing quantum materials.

In this talk, I will discuss a theoretical study of graphene subject to a smooth moiré electrostatic potential generated by an insulating substrate. For sufficiently large moiré wavelengths, the system develops ultra-flat bands coexisting with a network of chiral one-dimensional conducting channels. This coexistence gives rise to unusual interaction effects involving spin and valley degrees of freedom, leading to a rich landscape of correlated electronic phases.

I will show how tuning the gate voltage can stabilize exotic correlated phases, including a non-coplanar state with intertwined magnetic and valley order. I will also discuss the distinct roles of quantum and classical fluctuations in shaping these phases. Finally, I will discuss twisted monolayer-bilayer graphene as a promising platform for realizing this physics experimentally.