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Title: Terahertz conductivity of twisted bilayer graphene
Authors: Zou, X.
Shang, J.
Leaw, J.
Luo, Z.
Luo, L.
La-O-Vorakiat, C.
Cheng, L.
Cheong, S.A.
Su, H.
Zhu, J.-X.
Liu, Y.
Loh, K.P. 
Castro Neto, A.H. 
Yu, T.
Chia, E.E.M.
Issue Date: 7-Feb-2013
Citation: Zou, X., Shang, J., Leaw, J., Luo, Z., Luo, L., La-O-Vorakiat, C., Cheng, L., Cheong, S.A., Su, H., Zhu, J.-X., Liu, Y., Loh, K.P., Castro Neto, A.H., Yu, T., Chia, E.E.M. (2013-02-07). Terahertz conductivity of twisted bilayer graphene. Physical Review Letters 110 (6) : -. ScholarBank@NUS Repository.
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 σ 1(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. © 2013 American Physical Society.
Source Title: Physical Review Letters
ISSN: 00319007
DOI: 10.1103/PhysRevLett.110.067401
Appears in Collections:Staff Publications

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