Tunable bandgaps and excitons in doped semiconducting carbon nanotubes made possible by acoustic plasmons

Abstract

Doping of semiconductors is essential in modern electronic and photonic devices. While doping is well understood in bulk semiconductors, the advent of carbon nanotubes and nanowires for nanoelectronic and nanophotonic applications raises some key questions about the role and impact of doping at low dimensionality. Here we show that for semiconducting carbon nanotubes, bandgaps and exciton binding energies can be dramatically reduced upon experimentally relevant doping, and can be tuned gradually over a broad range of energies in contrast to higher dimensional systems. The later feature is made possible by a novel mechanism involving strong dynamical screening effects mediated by acoustic plasmons.

5 pages, 4 figures, published in Phys. Rev. Lett.

References in corpus (4)

• Room Temperature All Semiconducting sub-10nm Graphene Nanoribbon Field-Effect Transistors
• Truncation of Periodic Image Interactions for Confined Systems
• Linear plasmon dispersion in single-wall carbon nanotubes and the collective excitation spectrum of graphene
• Strong exciton-plasmon coupling in semiconducting carbon nanotubes

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• Renormalization of quasiparticle band gap in doped two-dimensional materials from many-body calculations
• Excitonic Effects on Optical Absorption Spectra of Doped Graphene
• Redshift of excitons in carbon nanotubes caused by the environment polarizability
• Gate-induced blueshift and quenching of photoluminescence in suspended single-walled carbon nanotubes
• Gate-voltage induced trions in suspended carbon nanotubes
• Single wall carbon nanotubes as coherent plasmon generators
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• Asymptotic exchange coupling of quasi-1D excitons in carbon nanotubes
• Narrow photoluminescence peak of epitaxial MoS${}_2$ on graphene/Ir(111)
• Quasiparticle band-gap renormalization in doped monolayer MoS${}_2$
• Probing Mobile Charge Carriers in Semiconducting Carbon Nanotube Networks by Charge Modulation Spectroscopy
• Possibility for exciton Bose-Einstein condensation in carbon nanotubes
• Relative stability of excitonic complexes in quasi-one-dimensional semiconductors
• Quasiparticle and Optical Properties of Carrier-Doped Monolayer MoTe${}_2$ from First Principles
• Tunable electronic correlation effects in nanotube-light interactions
• Impact of Dielectric Environment on Trion Emission from Single-Walled Carbon Nanotube Networks
• Photoinduced Absorption within Single-Walled Carbon Nanotube Systems
• Many-body effects on the electronic and optical properties of strained semiconducting carbon nanotubes
• One-dimensional transport in hybrid metal-semiconductor nanotube systems
• Configuration space method for calculating binding energies of exciton complexes in quasi-1D/2D semiconductors
• Independence of Optical Absorption on Auger Ionization in Single-Walled Carbon Nanotubes Revealed by Ultrafast e-h Photodoping
• Spectroscopic signatures of many-particle energy levels in non-covalently doped single-wall carbon nanotubes
• Quantum dynamics of single-photon detection using functionalized quantum transport electronic channels