Terahertz Conductivity of Twisted Bilayer Graphene

被引：69

作者：

Zou, Xingquan ^{[1
]}

Shang, Jingzhi ^{[1
]}

Leaw, Jianing ^{[1
]}

Luo, Zhiqiang ^{[1
]}

Luo, Liyan ^{[1
]}

La-o-Vorakiat, Chan ^{[1
]}

Cheng, Liang ^{[1
]}

Cheong, S. A. ^{[1
]}

Su, Haibin ^{[2
]}

Zhu, Jian-Xin ^{[3
,4
]}

Liu, Yanpeng ^{[5
]}

Loh, Kian Ping ^{[5
]}

Castro Neto, A. H. ^{[6
,7
]}

Yu, Ting ^{[1
]}

Chia, Elbert E. M. ^{[1
]}

机构：

[1] Nanyang Technol Univ, Div Phys & Appl Phys, Sch Phys & Math Sci, Singapore 637371, Singapore

[2] Nanyang Technol Univ, Sch Mat Sci & Engn, Div Mat Sci, Singapore 639798, Singapore

[3] Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA

[4] Los Alamos Natl Lab, Ctr Integrated Nanotechnol, Los Alamos, NM 87545 USA

[5] Natl Univ Singapore, Dept Chem, Singapore 117543, Singapore

[6] Natl Univ Singapore, Graphene Res Ctr, Singapore 117546, Singapore

[7] Natl Univ Singapore, Dept Phys, Singapore 117546, Singapore

来源：

PHYSICAL REVIEW LETTERS | 2013年 / 110卷 / 06期

关键词：

TIME-DOMAIN SPECTROSCOPY; FILMS;

D O I：

10.1103/PhysRevLett.110.067401

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Using terahertz time-domain spectroscopy, the real part of optical conductivity [sigma(1)(omega)] 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 sigma(1)(omega) at similar to 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. DOI: 10.1103/PhysRevLett.110.067401

引用

页数：5

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