LIVIVO - The Search Portal for Life Sciences

zur deutschen Oberfläche wechseln
Advanced search

Search results

Result 1 - 10 of total 41

Search options

  1. Article ; Online: Excitonic Complexes in Two-Dimensional Transition Metal Dichalcogenides.

    Chen, Xiaotong / Lian, Zhen / Meng, Yuze / Ma, Lei / Shi, Su-Fei

    Nature communications

    2023  Volume 14, Issue 1, Page(s) 8233

    Language English
    Publishing date 2023-12-12
    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/s41467-023-44119-9
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

  2. Article ; Online: Stark Effects of Rydberg Excitons in a Monolayer WSe

    Lian, Zhen / Li, Yun-Mei / Yan, Li / Ma, Lei / Chen, Dongxue / Taniguchi, Takashi / Watanabe, Kenji / Zhang, Chuanwei / Shi, Su-Fei

    Nano letters

    2024  

    Abstract: The enhanced Coulomb interaction in two-dimensional semiconductors leads to tightly bound electron-hole pairs known as excitons. The large binding energy of excitons enables the formation of Rydberg excitons with high principal quantum numbers (n), ... ...

    Abstract The enhanced Coulomb interaction in two-dimensional semiconductors leads to tightly bound electron-hole pairs known as excitons. The large binding energy of excitons enables the formation of Rydberg excitons with high principal quantum numbers (n), analogous to Rydberg atoms. Rydberg excitons possess strong interactions among themselves as well as sensitive responses to external stimuli. Here, we probe Rydberg exciton resonances through photocurrent spectroscopy in a monolayer WSe
    Language English
    Publishing date 2024-04-12
    Publishing country United States
    Document type Journal Article
    ISSN 1530-6992
    ISSN (online) 1530-6992
    DOI 10.1021/acs.nanolett.4c00134
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

  3. Article ; Online: Six-Body and Eight-Body Exciton States in Monolayer WSe_{2}.

    Van Tuan, Dinh / Shi, Su-Fei / Xu, Xiaodong / Crooker, Scott A / Dery, Hanan

    Physical review letters

    2022  Volume 129, Issue 7, Page(s) 76801

    Abstract: In the archetypal monolayer semiconductor WSe_{2}, the distinct ordering of spin-polarized valleys (low-energy pockets) in the conduction band allows for studies of not only simple neutral excitons and charged excitons (i.e., trions), but also more ... ...

    Abstract In the archetypal monolayer semiconductor WSe_{2}, the distinct ordering of spin-polarized valleys (low-energy pockets) in the conduction band allows for studies of not only simple neutral excitons and charged excitons (i.e., trions), but also more complex many-body states that are predicted at higher electron densities. We discuss magneto-optical measurements of electron-rich WSe_{2} monolayers and interpret the spectral lines that emerge at high electron doping as optical transitions of six-body exciton states ("hexcitons") and eight-body exciton states ("oxcitons"). These many-body states emerge when a photoexcited electron-hole pair interacts simultaneously with multiple Fermi seas, each having distinguishable spin and valley quantum numbers. In addition, we explain the relations between dark trions and satellite optical transitions of hexcitons in the photoluminescence spectrum.
    Language English
    Publishing date 2022-08-26
    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.129.076801
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

    In stock of ZB MED Bonn / Germany

    Z 4' 58/153: Show issues

    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

  4. Article ; Online: Machine Learning-Aided Band Gap Engineering of BaZrS

    Sharma, Shyam / Ward, Zachary D / Bhimani, Kevin / Sharma, Mukul / Quinton, Joshua / Rhone, Trevor David / Shi, Su-Fei / Terrones, Humberto / Koratkar, Nikhil

    ACS applied materials & interfaces

    2023  Volume 15, Issue 15, Page(s) 18962–18972

    Abstract: The non-toxic and stable chalcogenide perovskite ... ...

    Abstract The non-toxic and stable chalcogenide perovskite BaZrS
    Language English
    Publishing date 2023-04-04
    Publishing country United States
    Document type Journal Article
    ISSN 1944-8252
    ISSN (online) 1944-8252
    DOI 10.1021/acsami.3c00618
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

  5. Article: Ultrafast Photocurrent and Absorption Microscopy of Few-Layer Transition Metal Dichalcogenide Devices That Isolate Rate-Limiting Dynamics Driving Fast and Efficient Photoresponse

    Vogt, Kyle T / Shi, Su-Fei / Wang, Feng / Graham, Matt W

    Journal of physical chemistry. 2020 June 18, v. 124, no. 28

    2020  

    Abstract: Despite inherently poor interlayer conductivity, photodetectors made from few-layer stacked 2D transition metal dichalcogenides (TMDs) such as WSe₂ and MoS₂ often yield a desirable fast (≤∼90 ps) and efficient (ϵ > ∼40%) photocurrent response. To ... ...

    Abstract Despite inherently poor interlayer conductivity, photodetectors made from few-layer stacked 2D transition metal dichalcogenides (TMDs) such as WSe₂ and MoS₂ often yield a desirable fast (≤∼90 ps) and efficient (ϵ > ∼40%) photocurrent response. To unambiguously separate the competing electronic escape and recombination rates, we combine ultrafast photocurrent (U-PC) and transient absorption (TA) microscopy methods. U-PC and TA kinetics obtained on WSe₂ photodetectors yield matching interlayer electronic escape times that accelerated from ∼1.6 ns to 86 ps with the applied E-field. These ultrafast rates predict the actual device PC efficiencies realized of 40–45%. The roughly linearly increasing electronic escape rates with applied voltage in TA and U-PC decay kinetics both give out-of-plane electron and hole mobilities of 0.129 and 0.031 cm²/(V s), respectively, in WSe₂. Above ∼10¹² photons/cm² incident flux, defect-assisted Auger scattering greatly lowers the efficiency by trapping carriers at vacancy defects. Both TA and PC spectra identify a metal vacancy subgap peak with 5.6 ns lifetime as one primary trap capturing carriers as they drift between layers. TA and U-PC microscopy independently provide the kinetics of electronic escape and recombination that determine PC device efficiency. For few-layer TMD devices, this simple rate law further predicts the observed nonlinear in PC dependence over a 10⁵ range of incident power.
    Keywords absorption ; electric current ; electric potential difference ; microscopy
    Language English
    Dates of publication 2020-0618
    Size p. 15195-15204.
    Publishing place American Chemical Society
    Document type Article
    Note NAL-AP-2-clean
    ISSN 1932-7455
    DOI 10.1021/acs.jpcc.0c02646
    Database NAL-Catalogue (AGRICOLA)

    More links

    Kategorien

    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

  6. Book ; Online: Hexcitons and oxcitons in monolayer WSe$_2$

    Van Tuan, Dinh / Shi, Su-Fei / Xu, Xiaodong / Crooker, Scott A. / Dery, Hanan

    2022  

    Abstract: In the archetypal monolayer semiconductor WSe$_2$, the distinct ordering of spin-polarized valleys (low-energy pockets) in the conduction band allows for studies of not only simple neutral excitons and charged excitons (i.e., trions), but also more ... ...

    Abstract In the archetypal monolayer semiconductor WSe$_2$, the distinct ordering of spin-polarized valleys (low-energy pockets) in the conduction band allows for studies of not only simple neutral excitons and charged excitons (i.e., trions), but also more complex many-body states that are predicted at higher electron densities. We discuss magneto-optical measurements of electron-rich WSe$_2$ monolayers, and interpret the spectral lines that emerge at high electron doping as optical transitions of 6-body exciton states ("hexcitons") and 8-body exciton states ("oxcitons"). These many-body states emerge when a photoexcited electron-hole pair interacts simultaneously with multiple Fermi seas, each having distinguishable spin and valley quantum numbers. In addition, we identify the energies of primary and satellite optical transitions of hexcitons in the photoluminescence spectrum.
    Keywords Condensed Matter - Materials Science
    Publishing date 2022-02-16
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    Full text online

    More links

    Kategorien

    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

  7. Article ; Online: Exciton Superposition across Moiré States in a Semiconducting Moiré Superlattice.

    Lian, Zhen / Chen, Dongxue / Meng, Yuze / Chen, Xiaotong / Su, Ying / Banerjee, Rounak / Taniguchi, Takashi / Watanabe, Kenji / Tongay, Sefaattin / Zhang, Chuanwei / Cui, Yong-Tao / Shi, Su-Fei

    Nature communications

    2023  Volume 14, Issue 1, Page(s) 5042

    Abstract: Moiré superlattices of semiconducting transition metal dichalcogenides enable unprecedented spatial control of electron wavefunctions, leading to emerging quantum states. The breaking of translational symmetry further introduces a new degree of freedom: ... ...

    Abstract Moiré superlattices of semiconducting transition metal dichalcogenides enable unprecedented spatial control of electron wavefunctions, leading to emerging quantum states. The breaking of translational symmetry further introduces a new degree of freedom: high symmetry moiré sites of energy minima behaving as spatially separated quantum dots. We demonstrate the superposition between two moiré sites by constructing a trilayer WSe
    Language English
    Publishing date 2023-08-19
    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/s41467-023-40783-z
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

  8. Article ; Online: Two-dimensional materials: Atomically thin p-n junctions.

    Shi, Su-Fei / Wang, Feng

    Nature nanotechnology

    2014  Volume 9, Issue 9, Page(s) 664–665

    Language English
    Publishing date 2014-09-02
    Publishing country England
    Document type Comment ; Journal Article
    ZDB-ID 2254964-X
    ISSN 1748-3395 ; 1748-3387
    ISSN (online) 1748-3395
    ISSN 1748-3387
    DOI 10.1038/nnano.2014.186
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

  9. Book ; Online: Ultrafast photocurrent and absorption microscopy of few-layer TMD devices isolate rate-limiting dynamics driving fast and efficient photoresponse

    Vogt, Kyle T. / Shi, Su-Fei / Wang, Feng / Graham, Matt W.

    2020  

    Abstract: Despite inherently poor interlayer conductivity, photodetectors made from few-layer devices of 2D transition metal dichalcogenides (TMDs) such as WSe$_2$ and MoS$_2$ can still yield a desirably fast ($\leq$90 ps) and efficient ($\epsilon$$>$40\%) ... ...

    Abstract Despite inherently poor interlayer conductivity, photodetectors made from few-layer devices of 2D transition metal dichalcogenides (TMDs) such as WSe$_2$ and MoS$_2$ can still yield a desirably fast ($\leq$90 ps) and efficient ($\epsilon$$>$40\%) photoresponse. By combining ultrafast photocurrent (U-PC) and transient absorption (TA) microscopy, the competing electronic escape and recombination rates are unambiguously identified in otherwise complex kinetics. Both the U-PC and TA response of WSe$_2$ yield matching interlayer electronic escape times that accelerate from 1.6 ns to 86 ns with applied $E$-field to predict the maximum device PC-efficiency realized of $\sim$44\%. The slope of the escape rates versus $E$-field suggests out-of-plane electron and hole mobilities of 0.129 and 0.031 cm$^2$/V$s$ respectively. Above $\sim$10$^{11}$ photons/cm$^{2}$ incident flux, defect-assisted Auger scattering greatly decreases efficiency by trapping carriers at vacancy defects. Both TA and PC spectra identify a metal-vacancy sub-gap peak with $\sim$5.6 ns lifetime as a primary trap capturing carriers as they hop between layers. Synchronous TA and U-PC microscopy show the\ net PC collected is modelled by a kinetic rate-law of electronic escape competing against the linear and nonlinear Auger recombination rates. This simple rate-model further predicts the PC-based dynamics, nonlinear amplitude and efficiency, $\epsilon$ over a 10$^5$ range of incident photon flux in few-layer WSe$_2$ and MoS$_2$ devices.

    Comment: 10 pages, 4 figures
    Keywords Physics - Applied Physics ; Condensed Matter - Materials Science
    Subject code 530
    Publishing date 2020-03-30
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    Full text online

    More links

    Kategorien

    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

  10. Article ; Online: Quadrupolar excitons and hybridized interlayer Mott insulator in a trilayer moiré superlattice.

    Lian, Zhen / Chen, Dongxue / Ma, Lei / Meng, Yuze / Su, Ying / Yan, Li / Huang, Xiong / Wu, Qiran / Chen, Xinyue / Blei, Mark / Taniguchi, Takashi / Watanabe, Kenji / Tongay, Sefaattin / Zhang, Chuanwei / Cui, Yong-Tao / Shi, Su-Fei

    Nature communications

    2023  Volume 14, Issue 1, Page(s) 4604

    Abstract: Transition metal dichalcogenide (TMDC) moiré superlattices, owing to the moiré flatbands and strong correlation, can host periodic electron crystals and fascinating correlated physics. The TMDC heterojunctions in the type-II alignment also enable long- ... ...

    Abstract Transition metal dichalcogenide (TMDC) moiré superlattices, owing to the moiré flatbands and strong correlation, can host periodic electron crystals and fascinating correlated physics. The TMDC heterojunctions in the type-II alignment also enable long-lived interlayer excitons that are promising for correlated bosonic states, while the interaction is dictated by the asymmetry of the heterojunction. Here we demonstrate a new excitonic state, quadrupolar exciton, in a symmetric WSe
    Language English
    Publishing date 2023-08-01
    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/s41467-023-40288-9
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

To top