Observations of superlattice Dirac points in one-dimensionally-rippled graphene on hexagonal BN using scanning tunneling spectroscopy
ORAL
Abstract
It has been predicted that superlattice potentials in graphene would induce new Dirac points due to lattice-induced chirality of charge carriers. In this talk, we present our experimental observations of new Dirac points in one-dimensionally-rippled graphene on hexagonal BN using scanning tunneling microscopy and spectroscopy. The ripples, formed by thermal cycles, showed two new Dirac points of which energy levels were proportional to 1/L, where L was the period of a ripple, in agreement with theoretical predictions. Our study shows that one-dimensional periodic potential is an accessible component for controlling electronic properties of graphene.
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Authors
Se-Jong Khang
Department of Physics, Korea University
Department of Physics, Korea University, Seoul 136-713, Korea
Min Wook Lee
Department of Physics, Korea University
Soon-Hyeong Lee
Department of Physics, Korea University
Min Wang
SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University (SKKU)
Sung Kyu Jang
SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University (SKKU)
Minwoo Kim
SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University (SKKU)
Sungjoo Lee
SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University (SKKU)
Sang-Woo Kim
SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University (SKKU)
Young Jae Song
SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University (SKKU)
