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  1. Book ; Online: Proposal for a distributed, community-driven academic publishing system

    Barbone, Matteo / Gündoğan, Mustafa / Kara, Dhiren M. / Pingault, Benjamin / Montblanch, Alejandro Rodriguez-Pardo / Stefan, Lucio / Tan, Anthony K. C.

    2023  

    Abstract: We propose an academic publishing system where research papers are stored in a network of data centres owned by university libraries and research institutions, and are interfaced with the academic community through a website. In our system, the editor is ...

    Abstract We propose an academic publishing system where research papers are stored in a network of data centres owned by university libraries and research institutions, and are interfaced with the academic community through a website. In our system, the editor is replaced by an initial adjusted community-wide evaluation, the standard peer-review is accompanied by a post-publication open-ended and community-wide review process, aiming at a more objective and longer-term evaluation, the publishing costs are reduced to the running costs of the servers, and access is fully open. Our proposal addresses the fundamental problems of the current system: it reduces publishing costs, allowing easier access by less well-funded institutions (especially from developing countries); it makes the editorial evaluation distributed and more transparent; it speeds up the peer review process by eliminating the need for multiple resubmissions; and it introduces a long-term, community-wide evaluation of papers, ensuring their continued relevance and accuracy; while maximising its main goals, i.e. ensuring the highest quality of peer review and giving the best referees, the most visibility and the most credit to the best papers. Our scheme is time-efficient, financially sustainable, ethically fair and represents a significant improvement over the current system.
    Keywords Computer Science - Digital Libraries ; Physics - Physics and Society
    Subject code 306
    Publishing date 2023-04-23
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Article ; Online: Demonstration of a Coherent Electronic Spin Cluster in Diamond.

    Knowles, Helena S / Kara, Dhiren M / Atatüre, Mete

    Physical review letters

    2016  Volume 117, Issue 10, Page(s) 100802

    Abstract: An obstacle for spin-based quantum sensors is magnetic noise due to proximal spins. However, a cluster of such spins can become an asset, if it can be controlled. Here, we polarize and readout a cluster of three nitrogen electron spins coupled to a ... ...

    Abstract An obstacle for spin-based quantum sensors is magnetic noise due to proximal spins. However, a cluster of such spins can become an asset, if it can be controlled. Here, we polarize and readout a cluster of three nitrogen electron spins coupled to a single nitrogen-vacancy spin in diamond. We further achieve sub-nm localization of the cluster spins. Finally, we demonstrate coherent spin exchange between the species by simultaneous dressing of the nitrogen-vacancy and the nitrogen states. These results establish the feasibility of environment-assisted sensing and quantum simulations with diamond spins.
    Language English
    Publishing date 2016-09-02
    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.117.100802
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Identification of Exciton Complexes in Charge-Tunable Janus W

    Feuer, Matthew S G / Montblanch, Alejandro R-P / Sayyad, Mohammed Y / Purser, Carola M / Qin, Ying / Alexeev, Evgeny M / Cadore, Alisson R / Rosa, Barbara L T / Kerfoot, James / Mostaani, Elaheh / Kalȩba, Radosław / Kolari, Pranvera / Kopaczek, Jan / Watanabe, Kenji / Taniguchi, Takashi / Ferrari, Andrea C / Kara, Dhiren M / Tongay, Sefaattin / Atatüre, Mete

    ACS nano

    2023  Volume 17, Issue 8, Page(s) 7326–7334

    Abstract: Janus transition-metal dichalcogenide monolayers are artificial materials, where one plane of chalcogen atoms is replaced by chalcogen atoms of a different type. Theory predicts an in-built out-of-plane electric field, giving rise to long-lived, dipolar ... ...

    Abstract Janus transition-metal dichalcogenide monolayers are artificial materials, where one plane of chalcogen atoms is replaced by chalcogen atoms of a different type. Theory predicts an in-built out-of-plane electric field, giving rise to long-lived, dipolar excitons, while preserving direct-bandgap optical transitions in a uniform potential landscape. Previous Janus studies had broad photoluminescence (>18 meV) spectra obfuscating their specific excitonic origin. Here, we identify the neutral and the negatively charged inter- and intravalley exciton transitions in Janus W
    Language English
    Publishing date 2023-04-14
    Publishing country United States
    Document type Journal Article
    ISSN 1936-086X
    ISSN (online) 1936-086X
    DOI 10.1021/acsnano.2c10697
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article: Observing bulk diamond spin coherence in high-purity nanodiamonds.

    Knowles, Helena S / Kara, Dhiren M / Atatüre, Mete

    Nature materials

    2013  Volume 13, Issue 1, Page(s) 21–25

    Abstract: Nitrogen-vacancy (NV) centres in diamond are attractive for research straddling quantum information science, nanoscale magnetometry and thermometry. Whereas ultrapure bulk diamond NVs sustain the longest spin coherence times among optically accessible ... ...

    Abstract Nitrogen-vacancy (NV) centres in diamond are attractive for research straddling quantum information science, nanoscale magnetometry and thermometry. Whereas ultrapure bulk diamond NVs sustain the longest spin coherence times among optically accessible spins, nanodiamond NVs exhibit persistently poor spin coherence. Here we introduce high-purity nanodiamonds accommodating record-long NV coherence times, >60 μs, observed through universal dynamical decoupling. We show that the main contribution to decoherence comes from nearby nitrogen impurities rather than surface states. We protect the NV spin free precession, essential to d.c. magnetometry, by driving solely these impurities into the motional narrowing regime. This extends the NV free induction decay time from 440 ns, longer than that in type Ib bulk diamond, to 1.27 μs, which is comparable to that in type IIa (impurity-free) diamond. These properties allow the simultaneous exploitation of both high sensitivity and nanometre resolution in diamond-based emergent quantum technologies.
    Language English
    Publishing date 2013-11-24
    Publishing country England
    Document type Journal Article
    ZDB-ID 2088679-2
    ISSN 1476-4660 ; 1476-1122
    ISSN (online) 1476-4660
    ISSN 1476-1122
    DOI 10.1038/nmat3805
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  5. Article ; Online: Reaching the Excitonic Limit in 2D Janus Monolayers by In Situ Deterministic Growth.

    Qin, Ying / Sayyad, Mohammed / Montblanch, Alejandro R-P / Feuer, Matthew S G / Dey, Dibyendu / Blei, Mark / Sailus, Renee / Kara, Dhiren M / Shen, Yuxia / Yang, Shize / Botana, Antia S / Atature, Mete / Tongay, Sefaattin

    Advanced materials (Deerfield Beach, Fla.)

    2021  Volume 34, Issue 6, Page(s) e2106222

    Abstract: Named after the two-faced Roman god of transitions, transition metal dichalcogenide (TMD) Janus monolayers have two different chalcogen surfaces, inherently breaking the out-of-plane mirror symmetry. The broken mirror symmetry and the resulting potential ...

    Abstract Named after the two-faced Roman god of transitions, transition metal dichalcogenide (TMD) Janus monolayers have two different chalcogen surfaces, inherently breaking the out-of-plane mirror symmetry. The broken mirror symmetry and the resulting potential gradient lead to the emergence of quantum properties such as the Rashba effect and the formation of dipolar excitons. Experimental access to these quantum properties, however, hinges on the ability to produce high-quality 2D Janus monolayers. Here, these results introduce a holistic 2D Janus synthesis technique that allows real-time monitoring of the growth process. This prototype chamber integrates in situ spectroscopy, offering fundamental insights into the structural evolution and growth kinetics, that allow the evaluation and optimization of the quality of Janus monolayers. The versatility of this method is demonstrated by synthesizing and monitoring the conversion of SWSe, SNbSe, and SMoSe Janus monolayers. Deterministic conversion and real-time data collection further aid in conversion of exfoliated TMDs to Janus monolayers and unparalleled exciton linewidth values are reached, compared to the current best standard. The results offer an insight into the process kinetics and aid in the development of new Janus monolayers with high optical quality, which is much needed to access their exotic properties.
    Language English
    Publishing date 2021-12-22
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 1474949-X
    ISSN 1521-4095 ; 0935-9648
    ISSN (online) 1521-4095
    ISSN 0935-9648
    DOI 10.1002/adma.202106222
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  6. Article ; Online: Large-scale quantum-emitter arrays in atomically thin semiconductors.

    Palacios-Berraquero, Carmen / Kara, Dhiren M / Montblanch, Alejandro R-P / Barbone, Matteo / Latawiec, Pawel / Yoon, Duhee / Ott, Anna K / Loncar, Marko / Ferrari, Andrea C / Atatüre, Mete

    Nature communications

    2017  Volume 8, Page(s) 15093

    Abstract: Quantum light emitters have been observed in atomically thin layers of transition metal dichalcogenides. However, they are found at random locations within the host material and usually in low densities, hindering experiments aiming to investigate this ... ...

    Abstract Quantum light emitters have been observed in atomically thin layers of transition metal dichalcogenides. However, they are found at random locations within the host material and usually in low densities, hindering experiments aiming to investigate this new class of emitters. Here, we create deterministic arrays of hundreds of quantum emitters in tungsten diselenide and tungsten disulphide monolayers, emitting across a range of wavelengths in the visible spectrum (610-680 nm and 740-820 nm), with a greater spectral stability than their randomly occurring counterparts. This is achieved by depositing monolayers onto silica substrates nanopatterned with arrays of 150-nm-diameter pillars ranging from 60 to 190 nm in height. The nanopillars create localized deformations in the material resulting in the quantum confinement of excitons. Our method may enable the placement of emitters in photonic structures such as optical waveguides in a scalable way, where precise and accurate positioning is paramount.
    Language English
    Publishing date 2017-05-22
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 2041-1723
    ISSN (online) 2041-1723
    DOI 10.1038/ncomms15093
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  7. Book ; Online: Confinement of long-lived interlayer excitons in WS$_2$/WSe$_2$ heterostructures

    Montblanch, Alejandro R. -P. / Kara, Dhiren M. / Paradisanos, Ioannis / Purser, Carola M. / Feuer, Matthew S. G. / Alexeev, Evgeny M. / Stefan, Lucio / Qin, Ying / Blei, Mark / Wang, Gang / Cadore, Alisson R. / Latawiec, Pawel / Lončar, Marko / Tongay, Sefaattin / Ferrari, Andrea C. / Atatüre, Mete

    2020  

    Abstract: Interlayer excitons in layered materials constitute a novel platform to study many-body phenomena arising from long-range interactions between quantum particles. The ability to localise individual interlayer excitons in potential energy traps is a key ... ...

    Abstract Interlayer excitons in layered materials constitute a novel platform to study many-body phenomena arising from long-range interactions between quantum particles. The ability to localise individual interlayer excitons in potential energy traps is a key step towards simulating Hubbard physics in artificial lattices. Here, we demonstrate spatial localisation of long-lived interlayer excitons in a strongly confining trap array using a WS$_{2}$/WSe$_{2}$ heterostructure on a nanopatterned substrate. We detect long-lived interlayer excitons with lifetime approaching 0.2 ms and show that their confinement results in a reduced lifetime in the microsecond range and stronger emission rate with sustained optical selection rules. The combination of a permanent dipole moment, spatial confinement and long lifetime places interlayer excitons in a regime that satisfies one of the requirements for observing long-range dynamics in an optically resolvable trap lattice.
    Keywords Condensed Matter - Mesoscale and Nanoscale Physics ; Condensed Matter - Materials Science ; Quantum Physics
    Subject code 530
    Publishing date 2020-05-05
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  8. Article ; Online: Charge-tuneable biexciton complexes in monolayer WSe

    Barbone, Matteo / Montblanch, Alejandro R-P / Kara, Dhiren M / Palacios-Berraquero, Carmen / Cadore, Alisson R / De Fazio, Domenico / Pingault, Benjamin / Mostaani, Elaheh / Li, Han / Chen, Bin / Watanabe, Kenji / Taniguchi, Takashi / Tongay, Sefaattin / Wang, Gang / Ferrari, Andrea C / Atatüre, Mete

    Nature communications

    2018  Volume 9, Issue 1, Page(s) 3721

    Abstract: Monolayer transition metal dichalcogenides have strong Coulomb-mediated many-body interactions. Theoretical studies have predicted the existence of numerous multi-particle excitonic states. Two-particle excitons and three-particle trions have been ... ...

    Abstract Monolayer transition metal dichalcogenides have strong Coulomb-mediated many-body interactions. Theoretical studies have predicted the existence of numerous multi-particle excitonic states. Two-particle excitons and three-particle trions have been identified by their optical signatures. However, more complex states such as biexcitons have been elusive due to limited spectral quality of the optical emission. Here, we report direct evidence of two biexciton complexes in monolayer tungsten diselenide: the four-particle neutral biexciton and the five-particle negatively charged biexciton. We distinguish these states by power-dependent photoluminescence and demonstrate full electrical switching between them. We determine the band states of the elementary particles comprising the biexcitons through magneto-optical spectroscopy. We also resolve a splitting of 2.5 meV for the neutral biexciton, which we attribute to the fine structure, providing reference for subsequent studies. Our results unveil the nature of multi-exciton complexes in transitionmetal dichalcogenides and offer direct routes towards deterministic control in many-body quantum phenomena.
    Language English
    Publishing date 2018-09-13
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S.
    ZDB-ID 2553671-0
    ISSN 2041-1723 ; 2041-1723
    ISSN (online) 2041-1723
    ISSN 2041-1723
    DOI 10.1038/s41467-018-05632-4
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  9. Article ; Online: Atomically thin quantum light-emitting diodes.

    Palacios-Berraquero, Carmen / Barbone, Matteo / Kara, Dhiren M / Chen, Xiaolong / Goykhman, Ilya / Yoon, Duhee / Ott, Anna K / Beitner, Jan / Watanabe, Kenji / Taniguchi, Takashi / Ferrari, Andrea C / Atatüre, Mete

    Nature communications

    2016  Volume 7, Page(s) 12978

    Abstract: Transition metal dichalcogenides are optically active, layered materials promising for fast optoelectronics and on-chip photonics. We demonstrate electrically driven single-photon emission from localized sites in tungsten diselenide and tungsten ... ...

    Abstract Transition metal dichalcogenides are optically active, layered materials promising for fast optoelectronics and on-chip photonics. We demonstrate electrically driven single-photon emission from localized sites in tungsten diselenide and tungsten disulphide. To achieve this, we fabricate a light-emitting diode structure comprising single-layer graphene, thin hexagonal boron nitride and transition metal dichalcogenide mono- and bi-layers. Photon correlation measurements are used to confirm the single-photon nature of the spectrally sharp emission. These results present the transition metal dichalcogenide family as a platform for hybrid, broadband, atomically precise quantum photonics devices.
    Language English
    Publishing date 2016-09-26
    Publishing country England
    Document type Journal Article
    ISSN 2041-1723
    ISSN (online) 2041-1723
    DOI 10.1038/ncomms12978
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