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Surface interactions and crystal incommensurability in 2D materials: the case of graphene on hexagonal boron nitride

Speaker: 
Jeil Jung (NUS Physics & Graphene Centre)
Date: 
Wed, 14/05/2014 - 2:00pm to 3:00pm
Location: 
S13-M01-11 (Physics Conference Room)
Event Type: 
Seminars

Abstract

When atomically thin two-dimensional materials are layered they often form incommensurate non-crystalline structures manifested in moiré patterns found when examined by scanning probes. In this talk I will address theoretically on a methodology based on first principles calculations to build models that incorporate surface interactions between layered materials for general lattice mismatch or angle misalignment. When applied in a heterojunction consisting of graphene and hexagonal boron nitride, we can derive an effective moire pseudospin superlattice Hamiltonian that provides an intuitive platform to understand the role of the substrate on the electronic properties of graphene. I will use this model to obtain information of experimental interest such as the band structure and (local) density of states.

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