Abstract
Theories predicted that one-dimensional superlattice potentials in graphene would induce new Dirac points, instead of gap opening, due to lattice-induced chirality of charge carriers, but experimental evidence is rarely available in the literature. Here, we report observations of new Dirac points in one-dimensionally rippled graphene on hexagonal boron nitride (h-BN) using scanning tunneling microscopy and spectroscopy. The rippled graphene, formed due to thermal procedures, showed two new Dirac points above and below the Fermi level. The energy difference between a new Dirac point and the Fermi level was proportional to 1/L, where L was the period of a ripple, in agreement with theoretical predictions. Our study shows that the one-dimensional periodic potential is an accessible component for controlling the electronic properties of graphene.
| Original language | English |
|---|---|
| Pages (from-to) | 19535-19538 |
| Number of pages | 4 |
| Journal | Journal of Physical Chemistry C |
| Volume | 119 |
| Issue number | 33 |
| DOIs | |
| Publication status | Published - 2015 Aug 20 |
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ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Electronic, Optical and Magnetic Materials
- Surfaces, Coatings and Films
- Energy(all)
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Observations of New Dirac Points in One-Dimensionally-Rippled Graphene on Hexagonal BN Using Scanning Tunneling Spectroscopy. / Jang, Won Jun; Lee, Min Wook; Kim, Howon; Park, Sangwoo; Jung, Seong Jun; Lee, Sungjoo; Song, Young Jae; Kahng, Se-Jong.
In: Journal of Physical Chemistry C, Vol. 119, No. 33, 20.08.2015, p. 19535-19538.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Observations of New Dirac Points in One-Dimensionally-Rippled Graphene on Hexagonal BN Using Scanning Tunneling Spectroscopy
AU - Jang, Won Jun
AU - Lee, Min Wook
AU - Kim, Howon
AU - Park, Sangwoo
AU - Jung, Seong Jun
AU - Lee, Sungjoo
AU - Song, Young Jae
AU - Kahng, Se-Jong
PY - 2015/8/20
Y1 - 2015/8/20
N2 - Theories predicted that one-dimensional superlattice potentials in graphene would induce new Dirac points, instead of gap opening, due to lattice-induced chirality of charge carriers, but experimental evidence is rarely available in the literature. Here, we report observations of new Dirac points in one-dimensionally rippled graphene on hexagonal boron nitride (h-BN) using scanning tunneling microscopy and spectroscopy. The rippled graphene, formed due to thermal procedures, showed two new Dirac points above and below the Fermi level. The energy difference between a new Dirac point and the Fermi level was proportional to 1/L, where L was the period of a ripple, in agreement with theoretical predictions. Our study shows that the one-dimensional periodic potential is an accessible component for controlling the electronic properties of graphene.
AB - Theories predicted that one-dimensional superlattice potentials in graphene would induce new Dirac points, instead of gap opening, due to lattice-induced chirality of charge carriers, but experimental evidence is rarely available in the literature. Here, we report observations of new Dirac points in one-dimensionally rippled graphene on hexagonal boron nitride (h-BN) using scanning tunneling microscopy and spectroscopy. The rippled graphene, formed due to thermal procedures, showed two new Dirac points above and below the Fermi level. The energy difference between a new Dirac point and the Fermi level was proportional to 1/L, where L was the period of a ripple, in agreement with theoretical predictions. Our study shows that the one-dimensional periodic potential is an accessible component for controlling the electronic properties of graphene.
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U2 - 10.1021/acs.jpcc.5b05835
DO - 10.1021/acs.jpcc.5b05835
M3 - Article
AN - SCOPUS:84939825582
VL - 119
SP - 19535
EP - 19538
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
SN - 1932-7447
IS - 33
ER -