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|Title:||Terahertz conductivity of twisted bilayer graphene|
Castro Neto, A.H.
|Source:||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|
|Appears in Collections:||Staff Publications|
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