Intertube Excitonic Coupling in Nanotube Van der Waals Heterostructures

被引:36
作者
Burdanova, Maria G. [1 ,2 ]
Liu, Ming [3 ]
Staniforth, Michael [2 ,4 ]
Zheng, Yongjia [3 ]
Xiang, Rong [3 ]
Chiashi, Shohei [3 ]
Anisimov, Anton [5 ]
Kauppinen, Esko, I [6 ]
Maruyama, Shigeo [3 ]
Lloyd-Hughes, James [2 ]
机构
[1] Moscow Inst Phys & Technol, Ctr Photon & 2D Mat, Inst Sky Lane 9, Dolgoprudnyi 141700, Russia
[2] Univ Warwick, Dept Phys, Gibbet Hill Rd, Coventry CV4 7AL, W Midlands, England
[3] Univ Tokyo, Dept Mech Engn, Tokyo 1138656, Japan
[4] Dept Chem, Gibbet Hill Rd, Coventry CV4 7AL, W Midlands, England
[5] Canatu Ltd, FI-00390 Helsinki, Finland
[6] Aalto Univ, Sch Sci, Dept Appl Phys, Espoo 15100, FI-00076 Aalto, Finland
基金
英国工程与自然科学研究理事会;
关键词
excitons; nanotubes; ultrafast spectroscopy; van der Waals heterostructures; ENERGY-TRANSFER;
D O I
10.1002/adfm.202104969
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Strong intertube excitonic coupling is demonstrated in 1D van der Waals heterostructures by examining the ultrafast response of radial C/BN/MoS2 core/shell/skin nanotubes to femtosecond infrared light pulses. Remarkably, infrared excitation of excitons in the semiconducting carbon nanotubes (CNTs) creates a prominent excitonic response in the visible range from the MoS2 skin, even with infrared photons at energies well below the bandgap of MoS2. Via classical analogies and a quantum model of the light-matter interaction these findings are assigned to intertube excitonic correlations. Dipole-dipole Coulomb interactions in the coherent regime produce intertube biexcitons, which persist for tens of femtoseconds, while on longer timescales (>100 ps) hole tunneling-from the CNT core, through the BN tunnel barrier, to the MoS2 skin-creates intertube excitons. Charge transfer and dipole-dipole interactions thus play prominent roles on different timescales, and establish new possibilities for the multi-functional use of these new nanoscale coaxial cables.
引用
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页数:8
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