Bulletin of the American Physical Society
APS March Meeting 2014
Volume 59, Number 1
Monday–Friday, March 3–7, 2014; Denver, Colorado
Session F55: Invited Session: Electronic Properties of Twisted Van der Waals heterostructures
8:00 AM–11:00 AM,
Tuesday, March 4, 2014
Room: Four Seasons Ballroom 1
Sponsoring Unit: DCMP
Chair: Pablo Jarillo-Herrero, Massachusetts Institute of Technology
Abstract ID: BAPS.2014.MAR.F55.3
Abstract: F55.00003 : Electronic properties of moire superlattice bands in layered two dimensional materials*
9:12 AM–9:48 AM
(Graphene Research Centre and Department of Physics, National University of Singapore)
When atomically thin two-dimensional materials are layered they often form incommensurate non-crystalline structures that exhibit long period moir\'e patterns when examined by scanning probes. In this talk, I will present a theoretical method which can be used to derive an effective Hamiltonian for these twisted van der Waals heterostructures using input from ab initio calculations performed on short-period crystalline structures. I will argue that the effective Hamiltonian can quantitatively describe the electronic properties of these layered systems for arbitrary twist angle and lattice constants [1-2]. Applying this method to the important cases of graphene on graphene and graphene on hexagonal-boron nitride, I will present a series of experimentally observable quantities that can be extracted from their electronic structure, including their density of states and local density of states as a function of twist angle, and compare with available experiments. \\[4pt]  Moire bands in twisted double-layer graphene, R. Bistritzer and A. H. MacDonald, PNAS 108 (30), 12233 (2011).\\[0pt]  Ab initio theory of moire bands in layered two-dimensional materials, J. Jung, A. Raoux, Z. H. Qiao and A. H. MacDonald, (submitted).
*Work done in collaboration with Allan MacDonald, Shaffique Adam, Arnaud Raoux, Zhenhua Qiao, and Ashley DaSilva; and supported by the Singapore National Research Foundation Fellowship NRF-NRFF2012-01.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2014.MAR.F55.3
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