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  1. AU="Chu, Zhaodong"
  2. AU="Rodríguez Gómez, Francisco" AU="Rodríguez Gómez, Francisco"
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  1. Article ; Online: Ultrafast Switching of Interfacial Thermal Conductance.

    Ahn, Youngjun / Zhang, Jiawei / Chu, Zhaodong / Walko, Donald A / Hruszkewycz, Stephan O / Fullerton, Eric E / Evans, Paul G / Wen, Haidan

    ACS nano

    2023  Volume 17, Issue 19, Page(s) 18843–18849

    Abstract: Dynamical control of thermal transport at the nanoscale provides a time-domain strategy for optimizing thermal management in nanoelectronics, magnetic devices, and thermoelectric devices. However, the rate of change available for thermal switches and ... ...

    Abstract Dynamical control of thermal transport at the nanoscale provides a time-domain strategy for optimizing thermal management in nanoelectronics, magnetic devices, and thermoelectric devices. However, the rate of change available for thermal switches and regulators is limited to millisecond time scales, calling for a faster modulation speed. Here, time-resolved X-ray diffraction measurements and thermal transport modeling reveal an ultrafast modulation of the interfacial thermal conductance of an FeRh/MgO heterostructure as a result of a structural phase transition driven by optical excitation. Within 90 ps after optical excitation, the interfacial thermal conductance is reduced by a factor of 5 and lasts for a few nanoseconds, in comparison to the value at the equilibrium FeRh/MgO interface. The experimental results combined with thermal transport calculations suggest that the reduced interfacial thermal conductance results from enhanced phonon scattering at the interface where the lattice experiences transient in-plane biaxial stress due to the structural phase transition of FeRh. Our results suggest that optically driven phase transitions can be utilized for ultrafast nanoscale thermal switches for device application.
    Language English
    Publishing date 2023-09-19
    Publishing country United States
    Document type Journal Article
    ISSN 1936-086X
    ISSN (online) 1936-086X
    DOI 10.1021/acsnano.3c03628
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Repositioning a Prolapsed Tube After Bicanalicular Intubation of the Lacrimal System.

    Chu, Zhaodong / Lu, Guohua / Tan, Ying / Deng, Yuan

    Ophthalmic plastic and reconstructive surgery

    2019  Volume 35, Issue 6, Page(s) 623–627

    Abstract: Objective: Prolapse of silicone tubes is one of the most common complications after bicanalicular intubation of the lacrimal system. This study describes a new method of repositioning prolapsed silicone tubes by using a suture-probe.: Methods: This ... ...

    Abstract Objective: Prolapse of silicone tubes is one of the most common complications after bicanalicular intubation of the lacrimal system. This study describes a new method of repositioning prolapsed silicone tubes by using a suture-probe.
    Methods: This study was a retrospective chart review of 12 patients who experienced complete silicone tube prolapse after bicanalicular intubation. The silicone tube was repositioned by using a suture-probe; a double-stranded suture was placed in the lacrimal duct with a lacrimal probe with a hole in the front blunt tip, then interlocked with the prolapsed silicone tube. Subsequently, the suture loop was slowly stretched from the nasal cavity, and the silicone tube was repositioned. The silicone tube at the medial canthus was cut and loosened, then pulled out of the nasal cavity.
    Results: In all 12 cases, the silicone tube was restored with 100% success by using the suture-probe. Three patients were extubated immediately after the repositioning. For another 9 patients with an indwelling tube, extubation was performed after 3-4 months, and no patients experienced further tube dislocation during that time.
    Conclusions: The suture-probe technique is a simple, low cost, and minimally traumatic method for repositioning a prolapsed silicone tube after bicanalicular intubation of the lacrimal system.A new technique, the suture-probe with thread interlocking the silicone tube ring can reposition the prolapsed silicone tube in lacrimal sac.
    MeSH term(s) Adult ; Aged ; Aged, 80 and over ; Dacryocystorhinostomy/methods ; Female ; Humans ; Intubation/methods ; Lacrimal Apparatus/surgery ; Lacrimal Duct Obstruction ; Male ; Middle Aged ; Retrospective Studies ; Suture Techniques
    Language English
    Publishing date 2019-06-20
    Publishing country United States
    Document type Journal Article
    ZDB-ID 632830-1
    ISSN 1537-2677 ; 0740-9303
    ISSN (online) 1537-2677
    ISSN 0740-9303
    DOI 10.1097/IOP.0000000000001400
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

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  3. Article ; Online: Superior photo-carrier diffusion dynamics in organic-inorganic hybrid perovskites revealed by spatiotemporal conductivity imaging.

    Ma, Xuejian / Zhang, Fei / Chu, Zhaodong / Hao, Ji / Chen, Xihan / Quan, Jiamin / Huang, Zhiyuan / Wang, Xiaoming / Li, Xiaoqin / Yan, Yanfa / Zhu, Kai / Lai, Keji

    Nature communications

    2021  Volume 12, Issue 1, Page(s) 5009

    Abstract: The outstanding performance of organic-inorganic metal trihalide solar cells benefits from the exceptional photo-physical properties of both electrons and holes in the material. Here, we directly probe the free-carrier dynamics in Cs-doped ... ...

    Abstract The outstanding performance of organic-inorganic metal trihalide solar cells benefits from the exceptional photo-physical properties of both electrons and holes in the material. Here, we directly probe the free-carrier dynamics in Cs-doped FAPbI
    Language English
    Publishing date 2021-08-18
    Publishing country England
    Document type Journal Article
    ZDB-ID 2553671-0
    ISSN 2041-1723 ; 2041-1723
    ISSN (online) 2041-1723
    ISSN 2041-1723
    DOI 10.1038/s41467-021-25311-1
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  4. Article ; Online: Chiral tunneling in a twisted graphene bilayer.

    He, Wen-Yu / Chu, Zhao-Dong / He, Lin

    Physical review letters

    2013  Volume 111, Issue 6, Page(s) 66803

    Abstract: The perfect transmission in a graphene monolayer and the perfect reflection in a Bernal graphene bilayer for electrons incident in the normal direction of a potential barrier are viewed as two incarnations of the Klein paradox. Here we show a new and ... ...

    Abstract The perfect transmission in a graphene monolayer and the perfect reflection in a Bernal graphene bilayer for electrons incident in the normal direction of a potential barrier are viewed as two incarnations of the Klein paradox. Here we show a new and unique incarnation of the Klein paradox. Owing to the different chiralities of the quasiparticles involved, the chiral fermions in a twisted graphene bilayer show an adjustable probability of chiral tunneling for normal incidence: they can be changed from perfect tunneling to partial or perfect reflection, or vice versa, by controlling either the height of the barrier or the incident energy. As well as addressing basic physics about how the chiral fermions with different chiralities tunnel through a barrier, our results provide a facile route to tune the electronic properties of the twisted graphene bilayer.
    Language English
    Publishing date 2013-08-09
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.111.066803
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  5. Article ; Online: Nanoscale Conductivity Imaging of Correlated Electronic States in WSe_{2}/WS_{2} Moiré Superlattices.

    Chu, Zhaodong / Regan, Emma C / Ma, Xuejian / Wang, Danqing / Xu, Zifan / Utama, M Iqbal Bakti / Yumigeta, Kentaro / Blei, Mark / Watanabe, Kenji / Taniguchi, Takashi / Tongay, Sefaattin / Wang, Feng / Lai, Keji

    Physical review letters

    2020  Volume 125, Issue 18, Page(s) 186803

    Abstract: We report the nanoscale conductivity imaging of correlated electronic states in angle-aligned WSe_{2}/WS_{2} heterostructures using microwave impedance microscopy. The noncontact microwave probe allows us to observe the Mott insulating state with one ... ...

    Abstract We report the nanoscale conductivity imaging of correlated electronic states in angle-aligned WSe_{2}/WS_{2} heterostructures using microwave impedance microscopy. The noncontact microwave probe allows us to observe the Mott insulating state with one hole per moiré unit cell that persists for temperatures up to 150 K, consistent with other characterization techniques. In addition, we identify for the first time a Mott insulating state at one electron per moiré unit cell. Appreciable inhomogeneity of the correlated states is directly visualized in the heterobilayer region, indicative of local disorders in the moiré superlattice potential or electrostatic doping. Our work provides important insights on 2D moiré systems down to the microscopic level.
    Language English
    Publishing date 2020-11-16
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.125.186803
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Bonn / Germany

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  6. Article ; Online: Impact of grain boundaries on efficiency and stability of organic-inorganic trihalide perovskites.

    Chu, Zhaodong / Yang, Mengjin / Schulz, Philip / Wu, Di / Ma, Xin / Seifert, Edward / Sun, Liuyang / Li, Xiaoqin / Zhu, Kai / Lai, Keji

    Nature communications

    2017  Volume 8, Issue 1, Page(s) 2230

    Abstract: Organic-inorganic perovskite solar cells have attracted tremendous attention because of their remarkably high power conversion efficiencies. To further improve device performance, it is imperative to obtain fundamental understandings on the photo- ... ...

    Abstract Organic-inorganic perovskite solar cells have attracted tremendous attention because of their remarkably high power conversion efficiencies. To further improve device performance, it is imperative to obtain fundamental understandings on the photo-response and long-term stability down to the microscopic level. Here, we report the quantitative nanoscale photoconductivity imaging on two methylammonium lead triiodide thin films with different efficiencies by light-stimulated microwave impedance microscopy. The microwave signals are largely uniform across grains and grain boundaries, suggesting that microstructures do not lead to strong spatial variations of the intrinsic photo-response. In contrast, the measured photoconductivity and lifetime are strongly affected by bulk properties such as the sample crystallinity. As visualized by the spatial evolution of local photoconductivity, the degradation process begins with the disintegration of grains rather than nucleation and propagation from visible boundaries between grains. Our findings provide insights to improve the electro-optical properties of perovskite thin films towards large-scale commercialization.
    Language English
    Publishing date 2017-12-20
    Publishing country England
    Document type Journal Article ; Research Support, U.S. Gov't, Non-P.H.S. ; Research Support, Non-U.S. Gov't
    ISSN 2041-1723
    ISSN (online) 2041-1723
    DOI 10.1038/s41467-017-02331-4
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    Inter-library loan at ZB MED

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  7. Book ; Online: Superior Photo-carrier Diffusion Dynamics in Organic-inorganic Hybrid Perovskites Revealed by Spatiotemporal Conductivity Imaging

    Ma, Xuejian / Zhang, Fei / Chu, Zhaodong / Hao, Ji / Chen, Xihan / Quan, Jiamin / Huang, Zhiyuan / Wang, Xiaoming / Li, Xiaoqin / Yan, Yanfa / Zhu, Kai / Lai, Keji

    2021  

    Abstract: The outstanding performance of organic-inorganic metal trihalide solar cells benefits from the exceptional photo-physical properties of both electrons and holes in the material. Here, we directly probe the free-carrier dynamics in Cs-doped FAPbI3 thin ... ...

    Abstract The outstanding performance of organic-inorganic metal trihalide solar cells benefits from the exceptional photo-physical properties of both electrons and holes in the material. Here, we directly probe the free-carrier dynamics in Cs-doped FAPbI3 thin films by spatiotemporal photoconductivity imaging. Using charge transport layers to selectively quench one type of carriers, we show that the two relaxation times on the order of 1 microsecond and 10 microseconds correspond to the lifetimes of electrons and holes in FACsPbI3, respectively. Strikingly, the diffusion mapping indicates that the difference in electron/hole lifetimes is largely compensated by their disparate mobility. Consequently, the long diffusion lengths (3 ~ 5 micrometers) of both carriers are comparable to each other, a feature closely related to the unique charge trapping and de-trapping processes in hybrid trihalide perovskites. Our results unveil the origin of superior diffusion dynamics in this material, crucially important for solar-cell applications.
    Keywords Condensed Matter - Mesoscale and Nanoscale Physics ; Condensed Matter - Materials Science ; Physics - Applied Physics ; Physics - Optics
    Publishing date 2021-08-04
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  8. Article ; Online: Visualization of Local Conductance in MoS

    Wu, Di / Li, Wei / Rai, Amritesh / Wu, Xiaoyu / Movva, Hema C P / Yogeesh, Maruthi N / Chu, Zhaodong / Banerjee, Sanjay K / Akinwande, Deji / Lai, Keji

    Nano letters

    2019  Volume 19, Issue 3, Page(s) 1976–1981

    Abstract: The vertical stacking of van der Waals (vdW) materials introduces a new degree of freedom to the research of two-dimensional (2D) systems. The interlayer coupling strongly influences the band structure of the heterostructures, resulting in novel ... ...

    Abstract The vertical stacking of van der Waals (vdW) materials introduces a new degree of freedom to the research of two-dimensional (2D) systems. The interlayer coupling strongly influences the band structure of the heterostructures, resulting in novel properties that can be utilized for electronic and optoelectronic applications. Based on microwave microscopy studies, we report quantitative electrical imaging on gated molybdenum disulfide (MoS
    Language English
    Publishing date 2019-02-21
    Publishing country United States
    Document type Journal Article ; Research Support, U.S. Gov't, Non-P.H.S. ; Research Support, Non-U.S. Gov't
    ISSN 1530-6992
    ISSN (online) 1530-6992
    DOI 10.1021/acs.nanolett.8b05159
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  9. Article ; Online: Unveiling defect-mediated carrier dynamics in monolayer semiconductors by spatiotemporal microwave imaging.

    Chu, Zhaodong / Wang, Chun-Yuan / Quan, Jiamin / Zhang, Chenhui / Lei, Chao / Han, Ali / Ma, Xuejian / Tang, Hao-Ling / Abeysinghe, Dishan / Staab, Matthew / Zhang, Xixiang / MacDonald, Allan H / Tung, Vincent / Li, Xiaoqin / Shih, Chih-Kang / Lai, Keji

    Proceedings of the National Academy of Sciences of the United States of America

    2020  Volume 117, Issue 25, Page(s) 13908–13913

    Abstract: The optoelectronic properties of atomically thin transition-metal dichalcogenides are strongly correlated with the presence of defects in the materials, which are not necessarily detrimental for certain applications. For instance, defects can lead to an ... ...

    Abstract The optoelectronic properties of atomically thin transition-metal dichalcogenides are strongly correlated with the presence of defects in the materials, which are not necessarily detrimental for certain applications. For instance, defects can lead to an enhanced photoconduction, a complicated process involving charge generation and recombination in the time domain and carrier transport in the spatial domain. Here, we report the simultaneous spatial and temporal photoconductivity imaging in two types of WS
    Language English
    Publishing date 2020-06-08
    Publishing country United States
    Document type Journal Article
    ZDB-ID 209104-5
    ISSN 1091-6490 ; 0027-8424
    ISSN (online) 1091-6490
    ISSN 0027-8424
    DOI 10.1073/pnas.2004106117
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    In stock of ZB MED Cologne/Königswinter

    Zs.A 1148: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
    bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
    Jg. 1995 - 2021: Lesesall (1.OG)
    ab Jg. 2022: Lesesaal (EG)

    Order via subito

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  10. Book ; Online: Nanoscale Conductivity Imaging of Correlated Electronic States in WSe2/WS2 Moir\'e Superlattices

    Chu, Zhaodong / Regan, Emma C / Ma, Xuejian / Wang, Danqing / Xu, Zifan / Utama, M. Iqbal Bakti / Yumigeta, Kentaro / Blei, Mark / Watanabe, Kenji / Taniguchi, Takashi / Tongay, Sefaattin / Wang, Feng / Lai, Keji

    2020  

    Abstract: We report the nanoscale conductivity imaging of correlated electronic states in angle-aligned WSe2/WS2 heterostructures using microwave impedance microscopy. The noncontact microwave probe allows us to observe the Mott insulating state with one hole per ... ...

    Abstract We report the nanoscale conductivity imaging of correlated electronic states in angle-aligned WSe2/WS2 heterostructures using microwave impedance microscopy. The noncontact microwave probe allows us to observe the Mott insulating state with one hole per moir\'e unit cell that persists for temperatures up to 150 K, consistent with other characterization techniques. In addition, we identify for the first time a Mott insulating state at one electron per moir\'e unit cell. Appreciable inhomogeneity of the correlated states is directly visualized in the hetero-bilayer region, indicative of local disorders in the moir\'e superlattice potential or electrostatic doping. Our work provides important insights on 2D moir\'e systems down to the microscopic level.

    Comment: 12 Pages, 4 figures
    Keywords Condensed Matter - Mesoscale and Nanoscale Physics ; Condensed Matter - Materials Science ; Condensed Matter - Strongly Correlated Electrons
    Subject code 530
    Publishing date 2020-07-13
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    Full text online

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