Terahertz conductivity of twisted bilayer graphene

Please use this identifier to cite or link to this item: https://doi.org/10.1103/PhysRevLett.110.067401

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. https://doi.org/10.1103/PhysRevLett.110.067401
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
URI:	http://scholarbank.nus.edu.sg/handle/10635/95202
ISSN:	00319007
DOI:	10.1103/PhysRevLett.110.067401
Appears in Collections:	Staff Publications

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