2017
DOI: 10.1038/s41598-017-11767-z
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Bandgap renormalization in single-wall carbon nanotubes

Abstract: Single-wall carbon nanotubes (SWNTs) have been extensively explored as an ultrafast nonlinear optical material. However, due to the numerous electronic and morphological arrangements, a simple and self-contained physical model that can unambiguously account for the rich photocarrier dynamics in SWNTs is still absent. Here, by performing broadband degenerate and non-degenerate pump-probe experiments on SWNTs of different chiralities and morphologies, we reveal strong evidences for the existence of bandgap renor… Show more

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Cited by 14 publications
(11 citation statements)
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“…The presence of broadband and unifying feature means that linewidth broadening effects, which typically involve the change of signal polarity at a specific transition photon energy, do not play a major role. [17][18][19] We further confirmed the experimental observation by carrying out pump-probe spectroscopy using an 80 MHz Ti:Sapphire OPO system, and the results with a probe wavelength down to 1.2 lm show qualitatively very similar response (Fig. S7).…”
supporting
confidence: 78%
“…The presence of broadband and unifying feature means that linewidth broadening effects, which typically involve the change of signal polarity at a specific transition photon energy, do not play a major role. [17][18][19] We further confirmed the experimental observation by carrying out pump-probe spectroscopy using an 80 MHz Ti:Sapphire OPO system, and the results with a probe wavelength down to 1.2 lm show qualitatively very similar response (Fig. S7).…”
supporting
confidence: 78%
“…29 BGR is primarily due to the change of electronic occupation that alters the dielectric screening and affects all electronic states simultaneously and thus could be observed in all excitonic transitions. 22,23 The detailed balance between band gap shrinkage and exciton binding energy may depend on the energy level and partly results in the reduced PB resonances in higher excitonic transitions. Although the pump photon energy is slightly lower than the probe energy in our study, this indeed reduces the contribution of Pauli blocking.…”
Section: Nano Lettersmentioning
confidence: 99%
“…Similar blueshifts were seen for the B exciton and the interband oscillator at 2.25 eV under IR excitation (Figure S7, Supporting Information), whereas direct excitation of the MoS 2 NTs at 3.0 eV produced a redshift in the A exciton energy as a result of bandgap renormalization. [ 27 ] Within the coherent regime (during the IR pulse), the blueshift may be understood as an optical Stark shift of the exciton energies in the MoS 2 . Alternatively, with a finite population in state E |10〉 there is an excited state absorption pathway (dashed line in Figure 1f) at an energy E |11〉 − E |10〉 = E |01〉 − E |00〉 − Δ, that is, an energy Δ below the excitonic resonances of the MoS 2 NTs.…”
Section: Resultsmentioning
confidence: 99%