NDLI: The electronic structure and intervalley coupling of artificial and genuine graphene superlattices

Content Provider	Springer Nature Link
Author	Kim, Pilkwang Park, Cheol Hwan
Copyright Year	2016
Abstract	The so-called artificial graphene is an artificial material whose low-energy carriers are described by the massless Dirac equation. Applying a periodic potential with triangular symmetry to a two-dimensional electron gas is one approach to make such a material. According to recent experimental results, it is now possible to realize artificial graphene in the lab and to even apply an additional lateral, one-dimensional periodic potential to it. We name the latter system an artificial graphene superlattice in order to distinguish it from a genuine graphene superlattice made from graphene. In this study, we investigate the electronic structure of artificial graphene superlattices, which exhibit the emergence of energy band gaps, merging and splitting of the Dirac points, etc. Then, from a similar investigation on genuine graphene superlattices, we show that many of these features originate from the coupling between Dirac fermions residing in two different valleys—the intervalley coupling. Furthermore, contrary to previous studies, we find that the effects of intervalley coupling on the electronic structure cannot be ignored, irrespective of the length of the spatial period of the superlattice.
Starting Page	1101
Ending Page	1115
Page Count	15
File Format	PDF
ISSN	19980124
Journal	Nano Research
Volume Number	9
Issue Number	4
e-ISSN	19980000
Language	English
Publisher	Tsinghua University Press
Publisher Date	2016-01-19
Publisher Place	Beijing
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	graphene artificial graphene graphene superlattice intervalley coupling Nanotechnology Materials Science Atomic/Molecular Structure and Spectra Condensed Matter Physics Biotechnology Biomedicine general
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology Atomic and Molecular Physics, and Optics Condensed Matter Physics Electrical and Electronic Engineering

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