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  1. Article ; Online: Anomalous Hall effect in Nd-doped Bi

    Chen, Lei / Zhao, Weiyao / Xing, Kaijian / You, Mengyun / Wang, Xiaolin / Zheng, Ren-Kui

    Physical chemistry chemical physics : PCCP

    2024  Volume 26, Issue 3, Page(s) 2638–2645

    Abstract: Topological insulators are emerging materials with insulating bulk and symmetry protected nontrivial surface states. One of the most fascinating transport behaviors in a topological insulator is the quantum anomalous Hall effect, which has been observed ... ...

    Abstract Topological insulators are emerging materials with insulating bulk and symmetry protected nontrivial surface states. One of the most fascinating transport behaviors in a topological insulator is the quantum anomalous Hall effect, which has been observed in magnetic-topological-insulator-based devices. In this work, we report successful doping of rare-earth element Nd into Bi
    Language English
    Publishing date 2024-01-17
    Publishing country England
    Document type Journal Article
    ZDB-ID 1476244-4
    ISSN 1463-9084 ; 1463-9076
    ISSN (online) 1463-9084
    ISSN 1463-9076
    DOI 10.1039/d3cp05850f
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  2. Article: Highly Sensitive NO

    Li, Wei / Shahbazi, Mahboobeh / Xing, Kaijian / Tesfamichael, Tuquabo / Motta, Nunzio / Qi, Dong-Chen

    Nanomaterials (Basel, Switzerland)

    2022  Volume 12, Issue 8

    Abstract: Recently, two-dimensional (2D) materials and their heterostructures have attracted considerable attention in gas sensing applications. In this work, we synthesized 2D ... ...

    Abstract Recently, two-dimensional (2D) materials and their heterostructures have attracted considerable attention in gas sensing applications. In this work, we synthesized 2D MoS
    Language English
    Publishing date 2022-04-11
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2662255-5
    ISSN 2079-4991
    ISSN 2079-4991
    DOI 10.3390/nano12081303
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  3. Article ; Online: Defects, band bending and ionization rings in MoS

    Di Bernardo, Iolanda / Blyth, James / Watson, Liam / Xing, Kaijian / Chen, Yi-Hsun / Chen, Shao-Yu / Edmonds, Mark T / Fuhrer, Michael S

    Journal of physics. Condensed matter : an Institute of Physics journal

    2022  Volume 34, Issue 17

    Abstract: Chalcogen vacancies in transition metal dichalcogenides are widely acknowledged as both donor dopants and as a source of disorder. The electronic structure of sulphur vacancies in ... ...

    Abstract Chalcogen vacancies in transition metal dichalcogenides are widely acknowledged as both donor dopants and as a source of disorder. The electronic structure of sulphur vacancies in MoS
    Language English
    Publishing date 2022-02-24
    Publishing country England
    Document type Journal Article
    ZDB-ID 1472968-4
    ISSN 1361-648X ; 0953-8984
    ISSN (online) 1361-648X
    ISSN 0953-8984
    DOI 10.1088/1361-648X/ac4f1d
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Book ; Online: Defects, band bending and ionization rings in MoS2

    Di Bernardo, Iolanda / Blyth, James / Watson, Liam / Xing, Kaijian / Chen, Yi-Hsun / Chen, Shao-Yu / Edmonds, Mark T. / Fuhrer, Michael S.

    2023  

    Abstract: Chalcogen vacancies in transition metal dichalcogenides are widely acknowledged as both donor dopants and as a source of disorder. The electronic structure of sulphur vacancies in MoS2 however is still controversial, with discrepancies in the literature ... ...

    Abstract Chalcogen vacancies in transition metal dichalcogenides are widely acknowledged as both donor dopants and as a source of disorder. The electronic structure of sulphur vacancies in MoS2 however is still controversial, with discrepancies in the literature pertaining to the origin of the in-gap features observed via scanning tunneling spectroscopy (STS) on single sulphur vacancies. Here we use a combination of scanning tunnelling microscopy (STM) and STS to study embedded sulphur vacancies in bulk MoS2 crystals. We observe spectroscopic features dispersing in real space and in energy, which we interpret as tip position- and bias-dependent ionization of the sulphur vacancy donor due to tip induced band bending (TIBB). The observations indicate that care must be taken in interpreting defect spectra as reflecting in-gap density of states, and may explain discrepancies in the literature.

    Comment: 7 pages, 5 figures
    Keywords Condensed Matter - Materials Science ; Condensed Matter - Other Condensed Matter
    Subject code 530
    Publishing date 2023-07-18
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  5. Article: Periodic nanostructures: preparation, properties and applications

    Yin, Hang / Xing, Kaijian / Zhang, Yurou / Dissanayake, D. M. Aradhana S / Lu, Ziyang / Zhao, Haitao / Zeng, Zhiyuan / Yun, Jung-Ho / Qi, Dong-Chen / Yin, Zongyou

    Chemical Society reviews. 2021 June 8, v. 50, no. 11

    2021  

    Abstract: Periodic nanostructures, a group of nanomaterials consisting of single or multiple nano units/components periodically arranged into ordered patterns (e.g., vertical and lateral superlattices), have attracted tremendous attention in recent years due to ... ...

    Abstract Periodic nanostructures, a group of nanomaterials consisting of single or multiple nano units/components periodically arranged into ordered patterns (e.g., vertical and lateral superlattices), have attracted tremendous attention in recent years due to their extraordinary physical and chemical properties that offer a huge potential for a multitude of applications in energy conversion, electronic and optoelectronic applications. Recent advances in the preparation strategies of periodic nanostructures, including self-assembly, epitaxy, and exfoliation, have paved the way to rationally modulate their ferroelectricity, superconductivity, band gap and many other physical and chemical properties. For example, the recent discovery of superconductivity observed in “magic-angle” graphene superlattices has sparked intensive studies in new ways, creating superlattices in twisted 2D materials. Recent development in the various state-of-the-art preparations of periodic nanostructures has created many new ideas and findings, warranting a timely review. In this review, we discuss the current advances of periodic nanostructures, including their preparation strategies, property modulations and various applications.
    Keywords energy conversion ; graphene ; superconductivity
    Language English
    Dates of publication 2021-0608
    Size p. 6423-6482.
    Publishing place The Royal Society of Chemistry
    Document type Article
    Note NAL-AP-2-clean
    ZDB-ID 1472875-8
    ISSN 1460-4744 ; 0306-0012
    ISSN (online) 1460-4744
    ISSN 0306-0012
    DOI 10.1039/d0cs01146k
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  6. Article: Strong spin-orbit interaction induced by transition metal oxides at the surface of hydrogen-terminated diamond

    Xing, Kaijian / Creedon, Daniel L / Yianni, Steve A / Akhgar, Golrokh / Zhang, Lei / Ley, Lothar / McCallum, Jeffrey C / Qi, Dong-Chen / Pakes, Christopher I

    Carbon. 2020 Aug. 30, v. 164

    2020  

    Abstract: Hydrogen-terminated diamond possesses an intriguing p-type surface conductivity which is induced via thermodynamically driven electron transfer from the diamond surface into surface acceptors such as atmospheric adsorbates, a process called surface ... ...

    Abstract Hydrogen-terminated diamond possesses an intriguing p-type surface conductivity which is induced via thermodynamically driven electron transfer from the diamond surface into surface acceptors such as atmospheric adsorbates, a process called surface transfer doping. High electron affinity transition metal oxides (TMOs) including MoO3 and V2O5 have been shown to be highly effective solid-state surface acceptors for diamond, giving rise to a sub-surface two-dimensional (2D) hole layer with metallic conduction. In this work, low temperature magnetotransport is used as a tool to show the presence of a Rashba-type spin-orbit interaction with a high spin-orbit coupling of 19.9 meV for MoO3 doping and 22.9 meV for V2O5 doping, respectively, through the observation of a transition in the phase-coherent backscattering transport from weak localization to weak antilocalization at low temperature. Surface transfer doping of diamond with TMOs provides a 2D hole system with spin-orbit coupling that is over two times larger than that reported for diamond surfaces with atmospheric acceptors, opening up possibilities to study and engineer spin transport in a carbon material system.
    Keywords carbon ; electron transfer ; oxides ; temperature ; thermodynamics
    Language English
    Dates of publication 2020-0830
    Size p. 244-250.
    Publishing place Elsevier Ltd
    Document type Article
    ISSN 0008-6223
    DOI 10.1016/j.carbon.2020.03.047
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  7. Book ; Online: Non-Drude THz conductivity of graphene due to structural distortions

    Nguyen, Tan-Phat / Klymenko, Mykhailo / Beane, Gary / Oldfield, Mitko / Xing, Kaijian / Gebert, Matthew / Bhattacharyya, Semonti / Fuhrer, Michael S. / Cole, Jared H. / Schiffrin, Agustin

    2023  

    Abstract: The remarkable electrical, optical and mechanical properties of graphene make it a desirable material for electronics, optoelectronics and quantum applications. A fundamental understanding of the electrical conductivity of graphene across a wide ... ...

    Abstract The remarkable electrical, optical and mechanical properties of graphene make it a desirable material for electronics, optoelectronics and quantum applications. A fundamental understanding of the electrical conductivity of graphene across a wide frequency range is required for the development of such technologies. In this study, we use terahertz (THz) time-domain spectroscopy to measure the complex dynamic conductivity of electrostatically gated graphene, in a broad $\sim$0.1 - 7 THz frequency range. The conductivity of doped graphene follows the conventional Drude model, and is predominantly governed by intraband processes. In contrast, undoped charge-neutral graphene exhibits a THz conductivity that significantly deviates from Drude-type models. Via quantum kinetic equations and density matrix theory, we show that this discrepancy can be explained by additional interband processes, that can be exacerbated by electron backscattering. We propose a mechanism where such backscattering -- which involves flipping of the electron pseudo-spin -- is mediated by the substantial vector scattering potentials that are associated with structural deformations of graphene. Our findings highlight the significant impact that structural distortions and resulting electrostatic vector scattering potentials can have on the THz conductivity of charge-neutral graphene. Our results emphasise the importance of the planar morphology of graphene for its broadband THz electronic response.

    Comment: 74 pages, 21 figures
    Keywords Condensed Matter - Materials Science
    Subject code 541
    Publishing date 2023-10-09
    Publishing country us
    Document type Book ; Online
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  8. Article: Surface transfer doping of diamond using solution-processed molybdenum trioxide

    Xing, Kaijian / Li, Wei / Della Gaspera, Enrico / van Embden, Joel / Zhang, Lei / Yianni, Steve A / Creedon, Daniel L / Wang, Tony / McCallum, Jeffrey C / Wang, Linjun / Huang, Jian / Pakes, Christopher I / Qi, Dong-Chen

    Carbon. 2021 Apr. 30, v. 175

    2021  

    Abstract: The surface of hydrogen-terminated diamond (H-terminated diamond) supports a p-type surface conductivity when interfaced with high electron-affinity surface acceptors through the surface transfer doping process. High electron-affinity transition metal ... ...

    Abstract The surface of hydrogen-terminated diamond (H-terminated diamond) supports a p-type surface conductivity when interfaced with high electron-affinity surface acceptors through the surface transfer doping process. High electron-affinity transition metal oxides (TMOs), such as MoO₃, have been regarded as superior candidates in surface transfer doping of diamond, holding great promise for enabling practical diamond electronic devices. In this work, a simple, solution-processed method is demonstrated to deposit a molybdenum trioxide (MoO₃) layer on H-terminated diamond surface to achieve surface transfer doping of diamond. The surface of diamond following the deposition of solution-processed MoO₃ (sp-MoO₃) experienced significant reduction in sheet resistivity, corresponding to an increase in hole density, compared with the pristine air-doped diamond. This hole accumulation layer induced by sp-MoO₃ is thermally stable up to 450 °C, and demonstrates metallic conductivity down to 250 mK with a strong spin-orbit interaction (SOI) in the induced two-dimensional (2D) surface conducting layer. Our study demonstrates that sp-MoO₃ is comparable with thermally-evaporated MoO₃ in doping performance but with great advantage as a simple, inexpensive and highly flexible fabrication method for developing diamond electronics.
    Keywords carbon ; electronics ; molybdenum ; thermal stability
    Language English
    Dates of publication 2021-0430
    Size p. 20-26.
    Publishing place Elsevier Ltd
    Document type Article
    Note NAL-AP-2-clean
    ISSN 0008-6223
    DOI 10.1016/j.carbon.2020.12.079
    Database NAL-Catalogue (AGRICOLA)

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  9. Article ; Online: Is Charge-Transfer Doping Possible at the Interfaces of Monolayer VSe

    Zhang, Lei / He, Xiaoyue / Xing, Kaijian / Zhang, Wen / Tadich, Anton / Wong, Ping Kwan Johnny / Qi, Dong-Chen / Wee, Andrew T S

    ACS applied materials & interfaces

    2019  Volume 11, Issue 46, Page(s) 43789–43795

    Abstract: Being a metallic transition-metal dichalcogenide, monolayer vanadium diselenide ( ... ...

    Abstract Being a metallic transition-metal dichalcogenide, monolayer vanadium diselenide (VSe
    Language English
    Publishing date 2019-11-08
    Publishing country United States
    Document type Journal Article
    ISSN 1944-8252
    ISSN (online) 1944-8252
    DOI 10.1021/acsami.9b16822
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  10. Article ; Online: Periodic nanostructures: preparation, properties and applications.

    Yin, Hang / Xing, Kaijian / Zhang, Yurou / Dissanayake, D M Aradhana S / Lu, Ziyang / Zhao, Haitao / Zeng, Zhiyuan / Yun, Jung-Ho / Qi, Dong-Chen / Yin, Zongyou

    Chemical Society reviews

    2021  Volume 50, Issue 11, Page(s) 6423–6482

    Abstract: Periodic nanostructures, a group of nanomaterials consisting of single or multiple nano units/components periodically arranged into ordered patterns (e.g., vertical and lateral superlattices), have attracted tremendous attention in recent years due to ... ...

    Abstract Periodic nanostructures, a group of nanomaterials consisting of single or multiple nano units/components periodically arranged into ordered patterns (e.g., vertical and lateral superlattices), have attracted tremendous attention in recent years due to their extraordinary physical and chemical properties that offer a huge potential for a multitude of applications in energy conversion, electronic and optoelectronic applications. Recent advances in the preparation strategies of periodic nanostructures, including self-assembly, epitaxy, and exfoliation, have paved the way to rationally modulate their ferroelectricity, superconductivity, band gap and many other physical and chemical properties. For example, the recent discovery of superconductivity observed in "magic-angle" graphene superlattices has sparked intensive studies in new ways, creating superlattices in twisted 2D materials. Recent development in the various state-of-the-art preparations of periodic nanostructures has created many new ideas and findings, warranting a timely review. In this review, we discuss the current advances of periodic nanostructures, including their preparation strategies, property modulations and various applications.
    Language English
    Publishing date 2021-06-07
    Publishing country England
    Document type Journal Article ; Review
    ZDB-ID 1472875-8
    ISSN 1460-4744 ; 0306-0012
    ISSN (online) 1460-4744
    ISSN 0306-0012
    DOI 10.1039/d0cs01146k
    Database MEDical Literature Analysis and Retrieval System OnLINE

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