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Fang N, Chang YR, Fujii S, Yamashita D, Maruyama M, Gao Y, Fong CF, Kozawa D, Otsuka K, Nagashio K, Okada S, Kato YK. Room-temperature quantum emission from interface excitons in mixed-dimensional heterostructures. Nat Commun 2024; 15:2871. [PMID: 38605019 PMCID: PMC11009238 DOI: 10.1038/s41467-024-47099-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2023] [Accepted: 03/19/2024] [Indexed: 04/13/2024] Open
Abstract
The development of van der Waals heterostructures has introduced unconventional phenomena that emerge at atomically precise interfaces. For example, interlayer excitons in two-dimensional transition metal dichalcogenides show intriguing optical properties at low temperatures. Here we report on room-temperature observation of interface excitons in mixed-dimensional heterostructures consisting of two-dimensional tungsten diselenide and one-dimensional carbon nanotubes. Bright emission peaks originating from the interface are identified, spanning a broad energy range within the telecommunication wavelengths. The effect of band alignment is investigated by systematically varying the nanotube bandgap, and we assign the new peaks to interface excitons as they only appear in type-II heterostructures. Room-temperature localization of low-energy interface excitons is indicated by extended lifetimes as well as small excitation saturation powers, and photon correlation measurements confirm antibunching. With mixed-dimensional van der Waals heterostructures where band alignment can be engineered, new opportunities for quantum photonics are envisioned.
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Affiliation(s)
- N Fang
- Nanoscale Quantum Photonics Laboratory, RIKEN Cluster for Pioneering Research, Saitama, Japan.
| | - Y R Chang
- Nanoscale Quantum Photonics Laboratory, RIKEN Cluster for Pioneering Research, Saitama, Japan
| | - S Fujii
- Quantum Optoelectronics Research Team, RIKEN Center for Advanced Photonics, Saitama, Japan
- Department of Physics, Keio University, Yokohama, Japan
| | - D Yamashita
- Quantum Optoelectronics Research Team, RIKEN Center for Advanced Photonics, Saitama, Japan
- Platform Photonics Research Center, National Institute of Advanced Industrial Science and Technology (AIST), Ibaraki, Japan
| | - M Maruyama
- Department of Physics, University of Tsukuba, Ibaraki, Japan
| | - Y Gao
- Department of Physics, University of Tsukuba, Ibaraki, Japan
| | - C F Fong
- Nanoscale Quantum Photonics Laboratory, RIKEN Cluster for Pioneering Research, Saitama, Japan
| | - D Kozawa
- Nanoscale Quantum Photonics Laboratory, RIKEN Cluster for Pioneering Research, Saitama, Japan
- Quantum Optoelectronics Research Team, RIKEN Center for Advanced Photonics, Saitama, Japan
- Research Center for Materials Nanoarchitectonics, National Institute for Materials Science, Ibaraki, Japan
| | - K Otsuka
- Nanoscale Quantum Photonics Laboratory, RIKEN Cluster for Pioneering Research, Saitama, Japan
- Department of Mechanical Engineering, The University of Tokyo, Tokyo, Japan
| | - K Nagashio
- Department of Materials Engineering, The University of Tokyo, Tokyo, Japan
| | - S Okada
- Department of Physics, University of Tsukuba, Ibaraki, Japan
| | - Y K Kato
- Nanoscale Quantum Photonics Laboratory, RIKEN Cluster for Pioneering Research, Saitama, Japan.
- Quantum Optoelectronics Research Team, RIKEN Center for Advanced Photonics, Saitama, Japan.
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Otsuka K, Ishii A, Kato YK. Super-resolution fluorescence imaging of carbon nanotubes using a nonlinear excitonic process. OPTICS EXPRESS 2019; 27:17463-17473. [PMID: 31252705 DOI: 10.1364/oe.27.017463] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2019] [Accepted: 05/22/2019] [Indexed: 06/09/2023]
Abstract
Highly efficient exciton-exciton annihilation process unique to one-dimensional systems is utilized for super-resolution imaging of air-suspended carbon nanotubes. Through the comparison of fluorescence signals in linear and sublinear regimes at different excitation powers, we extract the efficiency of the annihilation processes using conventional confocal microscopy. Spatial images of the annihilation rate of the excitons have resolution beyond the diffraction limit. We investigate excitation power dependence of the annihilation processes by experiment and Monte Carlo simulation, and the resolution improvement of the annihilation images can be quantitatively explained by the superlinearity of the annihilation process. We have also developed another method in which the cubic dependence of the annihilation rate on exciton density is utilized to achieve further sharpening of single nanotube images.
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Zakharko Y, Graf A, Schießl SP, Hähnlein B, Pezoldt J, Gather MC, Zaumseil J. Broadband Tunable, Polarization-Selective and Directional Emission of (6,5) Carbon Nanotubes Coupled to Plasmonic Crystals. NANO LETTERS 2016; 16:3278-84. [PMID: 27105249 PMCID: PMC4867777 DOI: 10.1021/acs.nanolett.6b00827] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2016] [Revised: 04/06/2016] [Indexed: 05/23/2023]
Abstract
We demonstrate broadband tunability of light emission from dense (6,5) single-walled carbon nanotube thin films via efficient coupling to periodic arrays of gold nanodisks that support surface lattice resonances (SLRs). We thus eliminate the need to select single-walled carbon nanotubes (SWNTs) with different chiralities to obtain narrow linewidth emission at specific near-infrared wavelengths. Emission from these hybrid films is spectrally narrow (20-40 meV) yet broadly tunable (∼1000-1500 nm) and highly directional (divergence <1.5°). In addition, SLR scattering renders the emission highly polarized, even though the SWNTs are randomly distributed. Numerical simulations are applied to correlate the increased local electric fields around the nanodisks with the observed enhancement of directional emission. The ability to control the emission properties of a single type of near-infrared emitting SWNTs over a wide range of wavelengths will enable application of carbon nanotubes in multifunctional photonic devices.
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Affiliation(s)
- Yuriy Zakharko
- Institute for Physical Chemistry, Universität Heidelberg, D-69120 Heidelberg, Germany
| | - Arko Graf
- Institute for Physical Chemistry, Universität Heidelberg, D-69120 Heidelberg, Germany
- SUPA, School of Physics and Astronomy, University of St. Andrews, St.
Andrews KY16 9SS, United
Kingdom
| | - Stefan P. Schießl
- Institute for Physical Chemistry, Universität Heidelberg, D-69120 Heidelberg, Germany
| | - Bernd Hähnlein
- Institut für Mikro- und Nanotechnologie, Technische Universität Ilmenau, 98693 Ilmenau, Germany
| | - Jörg Pezoldt
- Institut für Mikro- und Nanotechnologie, Technische Universität Ilmenau, 98693 Ilmenau, Germany
| | - Malte C. Gather
- SUPA, School of Physics and Astronomy, University of St. Andrews, St.
Andrews KY16 9SS, United
Kingdom
| | - Jana Zaumseil
- Institute for Physical Chemistry, Universität Heidelberg, D-69120 Heidelberg, Germany
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Uda T, Yoshida M, Ishii A, Kato YK. Electric-Field Induced Activation of Dark Excitonic States in Carbon Nanotubes. NANO LETTERS 2016; 16:2278-2282. [PMID: 26999284 DOI: 10.1021/acs.nanolett.5b04595] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Electrical activation of optical transitions to parity-forbidden dark excitonic states in individual carbon nanotubes is reported. We examine electric-field effects on various excitonic states by simultaneously measuring photocurrent and photoluminescence. As the applied field increases, we observe an emergence of new absorption peaks in the excitation spectra. From the diameter dependence of the energy separation between the new peaks and the ground state of E11 excitons, we attribute the peaks to the dark excited states which became optically active due to the applied field. Field-induced exciton dissociation can explain the photocurrent threshold field, and the edge of the E11 continuum states has been identified by extrapolating to zero threshold.
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Affiliation(s)
- T Uda
- Institute of Engineering Innovation, The University of Tokyo , Tokyo 113-8656, Japan
| | - M Yoshida
- Institute of Engineering Innovation, The University of Tokyo , Tokyo 113-8656, Japan
| | - A Ishii
- Institute of Engineering Innovation, The University of Tokyo , Tokyo 113-8656, Japan
| | - Y K Kato
- Institute of Engineering Innovation, The University of Tokyo , Tokyo 113-8656, Japan
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