Journal
PHYSICAL REVIEW LETTERS
Volume 110, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.110.067401
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Funding
- Singapore MOE AcRF Tier 2 [ARC 23/08]
- NRF CRP [NRF-CRP4-2008-04, R-144-000-295-281]
- NNSA of the U.S. DOE at LANL [DE-AC52-06NA25396]
- U.S. DOE Office of Basic Energy Sciences
- DOE [DE-FG02-08ER46512]
- ONR MURI Grant [N00014-09-1-1063]
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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
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