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Title: Terahertz conductivity of twisted bilayer graphene
Authors: Castro Neto, A. H.
Chia, Elbert E. M.
Zou, Xingquan
Shang, Jingzhi
Leaw, Jianing
Luo, Zhiqiang
Luo, Liyan
Chan, La-o-vorakiat
Cheng, Liang
Cheong, Siew Ann
Su, Haibin
Zhu, Jian-Xin
Liu, Yanpeng
Loh, Kian Ping
Yu, Ting
Keywords: DRNTU::Science::Physics::Atomic physics
Issue Date: 2013
Source: Zou, X., Shang, J., Leaw, J., Luo, Z., Luo, L., Chan, L. V., et al. (2013). Terahertz conductivity of twisted bilayer graphene. Physical review letters, 110(6).
Series/Report no.: Physical review letters
Abstract: Using terahertz time-domain spectroscopy, the real part of optical conductivity [ σ1(ω)] of twisted bilayer graphene was obtained at different temperatures (10–300 K) in the frequency range 0.3–3 THz. On top of a Drude-like response, we see a strong peak in σ1(ω) at ~2.7 THz. We analyze the overall Drude-like response using a disorder-dependent (unitary scattering) model, then attribute the peak at 2.7 THz to an enhanced density of states at that energy, which is caused by the presence of a van Hove singularity arising from a commensurate twisting of the two graphene layers.
DOI: 10.1103/PhysRevLett.110.067401
Rights: © 2013 American Physical Society. This paper was published in Physical Review Letters and is made available as an electronic reprint (preprint) with permission of American Physical Society. The paper can be found at the following official DOI: One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.
Fulltext Permission: open
Fulltext Availability: With Fulltext
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