Terahertz conductivity of twisted bilayer graphene.
Terahertz conductivity of twisted bilayer graphene.
复制标题
DOI：
10.1103/physrevlett.110.067401
复制
发表时间：
2013-02
影响因子：
8.6
通讯作者：
X. Zou;J. Shang;J. Leaw;Zhiqiang Luo;Liyan Luo;C. La-o-vorakiat;Liang Cheng;S. Cheong;H. Su
中科院分区：
文献类型：
--
作者：
X. Zou;J. Shang;J. Leaw;Zhiqiang Luo;Liyan Luo;C. La-o-vorakiat;Liang Cheng;S. Cheong;H. Su
Using terahertz time-domain spectroscopy, the real part of optical conductivity [σ(1)(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.
