Terahertz conductivity of twisted bilayer graphene

Terahertz conductivity of twisted bilayer graphene

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 over...

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Bibliographic Details
Main 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
Other Authors: School of Physical and Mathematical Sciences
Format: Article
Language:English
Published: 2013
Subjects:
DRNTU::Science::Physics::Atomic physics
Online Access:https://hdl.handle.net/10356/96399
http://hdl.handle.net/10220/9904
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Institution: Nanyang Technological University
Language: English
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Summary: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.

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