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  • AIP Publishing  (4)
  • Liu, Zhen  (4)
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  • AIP Publishing  (4)
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  • 1
    Online Resource
    Online Resource
    Temperature-dependent photoluminescence and lasing properties of CsPbBr3 nanowires
    AIP Publishing ; 2019
    In:  Applied Physics Letters Vol. 114, No. 10 ( 2019-03-11)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 114, No. 10 ( 2019-03-11)
    Abstract: Exploring the exciton-phonon interaction of cesium lead bromide (CsPbBr3) perovskite nanowires (NWs) is not only important to the fundamental understanding of phonon-assisted carrier dynamics but also critical for the development of high performance miniaturized light sources. Herein, we systematically investigated the temperature (T) dependent spontaneous emission (SE) and lasing spectra of chemical vapor deposited CsPbBr3 NWs. We demonstrated that both the SE and the lasing energy were mainly determined by two facts: the electron-phonon interaction (EP) and the lattice thermal expansion (TE). The lattice TE effect plays a key role at T ∼ 78–170 K, therefore both the lasing and SE peaks exhibit a nearly linear blueshift with increasing T. As T  & gt; 195 K, the EP interaction becomes dominant, which reduces the blueshift rate of the SE peak and causes a redshift of lasing peaks. These findings will further advance the understanding of the exciton-phonon interaction and the T-dependence of emission properties of lasers and related optoelectronic devices.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.5082759
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2019
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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    Online Resource
  • 2
    Online Resource
    Online Resource
    Stacking two superconducting nanowire single-photon detectors via membrane microchip transfer
    AIP Publishing ; 2022
    In:  Applied Physics Letters Vol. 121, No. 11 ( 2022-09-12)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 121, No. 11 ( 2022-09-12)
    Abstract: Multilayer superconducting nanowire single-photon detectors (SNSPDs) have exhibited several advantages, such as increased detection efficiency, reduced polarization sensitivity, and scaling up to large arrays. However, monolithic fabrication of such multilayer devices is challenging. In this work, a hybrid integration method has been introduced by etching SNSPDs into the membrane microchips, followed by the pick and place transferring process. This method has been verified by stacking two SNSPDs orthogonally. Both detectors show near saturated detection efficiencies and low timing jitters. Furthermore, thermal coupling effects have been observed between the two SNSPDs. The photon detection pulses from either detector can trigger the other one almost deterministically with a latency of several nanoseconds. This method offers a flexible way to fabricate multilayer SNSPDs or integrate them with other heterogeneous devices.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/5.0118213
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2022
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 3
    Online Resource
    Online Resource
    Molecular dynamics simulation of shish-kebab crystallization of polyethylene: Unraveling the effects of molecular weight distribution
    AIP Publishing ; 2019
    In:  The Journal of Chemical Physics Vol. 150, No. 18 ( 2019-05-14)
    Details
    In: The Journal of Chemical Physics, AIP Publishing, Vol. 150, No. 18 ( 2019-05-14)
    Abstract: By means of molecular dynamics simulations, extensional flow was performed on five polyethylene models with different molecular weight distributions (MWDs) precisely designed in view of Grubbs, metallocene, Ziegler-Natta, and chromium-based catalysts, while ignoring the sequence distributions of short branches to shed light on the molecular mechanism of MWD on shish-kebab formation. The formation of shish-kebab crystallites can be divided into three stages: the emergence of precursors, evolution from precursors to shish nuclei, and the formation of lamellar crystallites. The results demonstrated that the precursors initiated from trans-rich segments with local order and minor crystallinity grew into large shish nuclei and eventually evolved into lamellae. There were more inconsecutively trans-state bonds occurring in long chains rather than in short chains, which promoted an easier transformation from precursors to shish nuclei. Therefore, broader MWDs make positive contributions to the formation of shish nuclei, increase the crystallization speed, and the generation of a more regular, compact, and thicker lamella with less tie molecule fractions, while the final crystallinity is independent of MWD.
    Type of Medium: Online Resource
    ISSN: 0021-9606 , 1089-7690
    URL: Article
    DOI: 10.1063/1.5089694
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2019
    detail.hit.zdb_id: 3113-6
    detail.hit.zdb_id: 1473050-9
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  • 4
    Online Resource
    Online Resource
    Enhanced strain effect of aged acceptor-doped BaTiO3 ceramics with clamping domain structures
    AIP Publishing ; 2017
    In:  Applied Physics Letters Vol. 110, No. 10 ( 2017-03-06)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 110, No. 10 ( 2017-03-06)
    Abstract: A clamping domain structure is proposed to improve the amount of non-180° domain switching in BaTiO3 based piezoelectric ceramics. Experimental results show a large unipolar strain of 0.23% at 5 kV/mm in aged 0.5 mol. % Mn doped BaTiO3 ceramics with clamping domain structures, and the normalized strain (d33* = Smax/Emax) reaches 600 pm/V at low electric fields of 2 or 3 kV/mm. In contrast, pure BaTiO3 ceramics with clamping domain structures exhibit no clear polarization constriction or strain enhancement at 3 kV/mm. Electron paramagnetic resonance spectra verify the existence of titanium vacancies, Mn2+ and Mn4+, in 0.5 mol. % Mn doped BaTiO3 ceramics. These results indicate that the enhanced strain effect can be attributed to the combined effect of the clamping domain structure and stabilization of defect dipoles. This method provides a general way to obtain large strain in ferroelectrics.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.4977492
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2017
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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    Online Resource
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