Abstract
We have investigated Bernal-stacked tetralayer graphene as a function of interlayer distance and perpendicular electric field by using density functional theory calculations. The low-energy band structure was found to be very sensitive to the interlayer distance, undergoing a metal-insulator transition. It can be attributed to the nearest-layer coupling that is more sensitive to the interlayer distance than are the next-nearest-layer couplings. Under a perpendicular electric field above a critical field, six electric-field-induced Dirac cones with mass gaps predicted in tight-binding models were confirmed, however, our density functional theory calculations demonstrate a phase transition to a quantum valley Hall insulator, contrasting to the tight-binding model prediction of an ordinary insulator.
| Original language | English |
|---|---|
| Journal | Current Applied Physics |
| DOIs | |
| Publication status | Accepted/In press - 2018 Jan 1 |
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Keywords
- A. Tetralayer graphene
- B. Interlayer couplings
- C. Metal-insulator transition
- D. Quantum valley Hall effect
ASJC Scopus subject areas
- Materials Science(all)
- Physics and Astronomy(all)
Cite this
Low-energy band structure very sensitive to the interlayer distance in Bernal-stacked tetralayer graphene. / Lee, Kyu Won; Lee, Cheol Eui.
In: Current Applied Physics, 01.01.2018.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Low-energy band structure very sensitive to the interlayer distance in Bernal-stacked tetralayer graphene
AU - Lee, Kyu Won
AU - Lee, Cheol Eui
PY - 2018/1/1
Y1 - 2018/1/1
N2 - We have investigated Bernal-stacked tetralayer graphene as a function of interlayer distance and perpendicular electric field by using density functional theory calculations. The low-energy band structure was found to be very sensitive to the interlayer distance, undergoing a metal-insulator transition. It can be attributed to the nearest-layer coupling that is more sensitive to the interlayer distance than are the next-nearest-layer couplings. Under a perpendicular electric field above a critical field, six electric-field-induced Dirac cones with mass gaps predicted in tight-binding models were confirmed, however, our density functional theory calculations demonstrate a phase transition to a quantum valley Hall insulator, contrasting to the tight-binding model prediction of an ordinary insulator.
AB - We have investigated Bernal-stacked tetralayer graphene as a function of interlayer distance and perpendicular electric field by using density functional theory calculations. The low-energy band structure was found to be very sensitive to the interlayer distance, undergoing a metal-insulator transition. It can be attributed to the nearest-layer coupling that is more sensitive to the interlayer distance than are the next-nearest-layer couplings. Under a perpendicular electric field above a critical field, six electric-field-induced Dirac cones with mass gaps predicted in tight-binding models were confirmed, however, our density functional theory calculations demonstrate a phase transition to a quantum valley Hall insulator, contrasting to the tight-binding model prediction of an ordinary insulator.
KW - A. Tetralayer graphene
KW - B. Interlayer couplings
KW - C. Metal-insulator transition
KW - D. Quantum valley Hall effect
UR - http://www.scopus.com/inward/record.url?scp=85051561227&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85051561227&partnerID=8YFLogxK
U2 - 10.1016/j.cap.2018.08.003
DO - 10.1016/j.cap.2018.08.003
M3 - Article
JO - Current Applied Physics
JF - Current Applied Physics
SN - 1567-1739
ER -