Tuning terahertz transitions in cyclo[n]carbon rings

Abstract

We develop an analytic model for an ideal polyyne ring which describes the induced THz gap in the molecular spectrum due to the Stark effect. This simple model can also be used to describe an odd-dimered cyclocarbon which has undergone a spontaneous symmetry-breaking event (due to the Jahn-Teller effect) as an effective dipole across an ideal ring. We show that both the size of the gap, and the strength of optical transitions across it, can be modulated by varying the external electric field strength. A THz emission scheme based on optical excitation is proposed, thus paving the way for a new class of THz emitters based on cyclo[n]carbon.

arXiv comment7 pages, 4 figures

References in corpus (15)

• The electronic properties of graphene
• An sp-hybridized molecular carbon allotrope, cyclo[18]carbon
• Terahertz Science and Technology of Carbon Nanomaterials
• Potential molecular semiconductor devices: cyclo-Cn (n = 10 and 14) with higher stabilities and aromaticities than acknowledged cyclo-C18
• Exciton storage in a nano-scale Aharonov-Bohm ring with electric field tuning
• Electronic properties of linear carbon chains: resolving the controversy
• Excitonic fine structure in emission of linear carbon chains
• Electric dipole moment oscillations in Aharonov-Bohm quantum rings
• Interband transitions in narrow-gap carbon nanotubes and graphene nanoribbons
• Aharonov-Bohm quantum rings in high-Q microcavities
• Bipolar electron waveguides in graphene
• Tuning terahertz transitions in a double-gated quantum ring
• Guided modes and terahertz transitions for two-dimensional Dirac fermions in a smooth double-well potential
• Metallic Carbon Nanotube Quantum Dots with Broken Symmetries as a Platform for Tunable Terahertz Detection
• Terahertz transitions in finite carbon chains