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Mark C. Hersam – One of the best experts on this subject based on the ideXlab platform.

  • 2D Materials for quantum information science
    Nature Reviews Materials, 2019
    Co-Authors: Mark C. Hersam
    Abstract:

    2D Materials exhibit diverse properties and can be integrated in heterostructures: this makes them ideal platforms for quantum infoinformation science. This Review surveys recent progress and identifies future opportunities for 2D Materials as quantum-dot qubits, single-photon emitters, superconducting qubits and topological quantum computing elements. The transformation of digital computers from bulky machines to portable systems has been enabled by new Materials and advanced processing technologies that allow ultrahigh integration of solid-state electronic switching devices. As this conventional scaling pathway has approached atomic-scale dimensions, the constituent nanoMaterials (such as SiO_2 gate dielectrics, poly-Si floating gates and Co–Cr–Pt ferromagnetic alloys) increasingly possess properties that are dominated by quantum physics. In parallel, quantum infoinformation science has emerged as an alternative to conventional transistor technology, promising new paradigms in computation, communication and sensing. The convergence between quantum Materials properties and prototype quantum devices is especially apparent in the field of 2D Materials, which offer a broad range of Materials properties, high flexibility in fabrication pathways and the ability to form artificial states of quantum matter. In this Review, we discuss the quantum properties and potential of 2D Materials as solid-state platforms for quantum-dot qubits, single-photon emitters, superconducting qubits and topological quantum computing elements. By focusing on the interplay between quantum physics and Materials science, we identify key opportunities and challenges for the use of 2D Materials in the field of quantum infoinformation science.

  • Interface Characterization and Control of 2D Materials and Heterostructures
    Advanced Materials, 2018
    Co-Authors: Xiaolong Liu, Mark C. Hersam
    Abstract:

    2D Materials and heterostructures have attracted significant attention for a variety of nanoelectronic and optoelectronic applications. At the atomically thin limit, the material characteristics and functionalities are dominated by surface chemistry and interface coupling. Therefore, methods for comprehensively characterizing and precisely controlling surfaces and interfaces are required to realize the full technological potential of 2D Materials. Here, the surface and interface properties that govern the performance of 2D Materials are introduced. Then the experimental approaches that resolve surface and interface phenomena down to the atomic scale, as well as strategies that allow tuning and optimization of interfacial interactions in van der Waals heterostructures, are systematically reviewed. Finally, a future outlook that delineates the remaining challenges and opportunities for 2D material interface characterization and control is presented.

  • Borophene as a prototype for synthetic 2D Materials development
    Nature Nanotechnology, 2018
    Co-Authors: Zhuhua Zhang, Andrew J. Mannix, Nathan P. Guisinger, Boris I. Yakobson, Mark C. Hersam
    Abstract:

    The synthesis of 2D Materials with no analogous bulk layered allotropes promises a substantial breadth of physical and chemical properties through the diverse structural options afforded by substrate-dependent epitaxy. However, despite the joint theoretical and experimental efforts to guide Materials discovery, successful demonstrations of synthetic 2D Materials have been rare. The recent synthesis of 2D boron polymorphs (that is, borophene) provides a notable example of such success. In this Perspective, we discuss recent progress and future opportunities for borophene research. Borophene combines unique mechanical properties with anisotropic metallicity, which complements the canon of conventional 2D Materials. The multi-centre characteristics of boronboron bonding lead to the formation of configurationally varied, vacancy-mediated structural motifs, providing unprecedented diversity in a mono-elemental 2D system with potential for electronic applications, chemical functionalization, Materials synthesis and complex heterostructures. With its foundations in computationally guided synthesis, borophene can serve as a prototype for ongoing efforts to discover and exploit synthetic 2D Materials.

Antonio Di Bartolomeo – One of the best experts on this subject based on the ideXlab platform.

Feng Ding – One of the best experts on this subject based on the ideXlab platform.

  • The epitaxy of 2D Materials growth
    Nature communications, 2020
    Co-Authors: Jichen Dong, Leining Zhang, Xinyue Dai, Feng Ding
    Abstract:

    Two dimensional (2D) Materials consist of one to a few atomic layers, where the intra-layer atoms are chemically bonded and the atomic layers are weakly bonded. The high bonding anisotropicity in 2D Materials make their growth on a substrate substantially different from the conventional thin film growth. Here, we proposed a general theoretical framework for the epitaxial growth of a 2D material on an arbitrary substrate. Our extensive density funcfunctional theory (DFT) calculations show that the propagating edge of a 2D material tends to align along a high symmetry direction of the substrate and, as a conclusion, the interplay between the symmetries of the 2D material and the substrate plays a critical role in the epitaxial growth of the 2D material. Based on our results, we have outlined that orientational uniformity of 2D material islands on a substrate can be realized only if the symmetry group of the substrate is a subgroup of that of the 2D material. Our predictions are in perfect agreement with most experimental observations on 2D Materials‘ growth on various substrates known up to now. We believe that this general guideline will lead to the large-scale synthesis of wafer-scale single crystals of various 2D Materials in the near future.

  • Kinetics of Graphene and 2D Materials Growth.
    Advanced Materials, 2018
    Co-Authors: Jichen Dong, Leining Zhang, Feng Ding
    Abstract:

    During the last 10 years, remarkable achievements on the chemical vapovaporosition (CVD) growth of 2D Materials have been made, but the understanding of the underlying mechanisms is still relatively limited. Here, the current progress on the understanding of the growth kinetics of 2D Materials, especially for their CVD synthesis, is reviewed. In order to present a complete picture of 2D Materialsgrowth kinetics, the following factors are discussed: i) two types of growth modes, namely attachment-limited growth and diffusion-limited growth; ii) the etching of 2D Materials, which offers an additional degree of freedom for growth control; iii) a number of experimental factors in graphene CVD synthesis, such as structure of the substrate, pressure of hydrogen or oxygen, temperature, etc., which are found to have profound effects on the growth kinetics; iv) double-layer and few-layer 2D Materials‘ growth, which has distinct features different from the growth of single-layer 2D Materials; and v) the growth of polycrystalline 2D Materials by the coalescence of a few single crystalline domains. Finally, the current challenges and opportunities in future 2D Materials‘ synthesis are summarized.

Jichen Dong – One of the best experts on this subject based on the ideXlab platform.

  • The epitaxy of 2D Materials growth
    Nature communications, 2020
    Co-Authors: Jichen Dong, Leining Zhang, Xinyue Dai, Feng Ding
    Abstract:

    Two dimensional (2D) Materials consist of one to a few atomic layers, where the intra-layer atoms are chemically bonded and the atomic layers are weakly bonded. The high bonding anisotropicity in 2D Materials make their growth on a substrate substantially different from the conventional thin film growth. Here, we proposed a general theoretical framework for the epitaxial growth of a 2D material on an arbitrary substrate. Our extensive density functional theory (DFT) calculations show that the propagating edge of a 2D material tends to align along a high symmetry direction of the substrate and, as a conclusion, the interplay between the symmetries of the 2D material and the substrate plays a critical role in the epitaxial growth of the 2D material. Based on our results, we have outlined that orientational uniformity of 2D material islands on a substrate can be realized only if the symmetry group of the substrate is a subgroup of that of the 2D material. Our predictions are in perfect agreement with most experimental observations on 2D Materials‘ growth on various substrates known up to now. We believe that this general guideline will lead to the large-scale synthesis of wafer-scale single crystals of various 2D Materials in the near future.

  • Kinetics of Graphene and 2D Materials Growth.
    Advanced Materials, 2018
    Co-Authors: Jichen Dong, Leining Zhang, Feng Ding
    Abstract:

    During the last 10 years, remarkable achievements on the chemical vapor deposition (CVD) growth of 2D Materials have been made, but the understanding of the underlying mechanisms is still relatively limited. Here, the current progress on the understanding of the growth kinetics of 2D Materials, especially for their CVD synthesis, is reviewed. In order to present a complete picture of 2D Materials‘ growth kinetics, the following factors are discussed: i) two types of growth modes, namely attachment-limited growth and diffusion-limited growth; ii) the etching of 2D Materials, which offers an additional degree of freedom for growth control; iii) a number of experimental factors in graphene CVD synthesis, such as structure of the substrate, pressure of hydrogen or oxygen, temperature, etc., which are found to have profound effects on the growth kinetics; iv) double-layer and few-layer 2D Materials‘ growth, which has distinct features different from the growth of single-layer 2D Materials; and v) the growth of polycrystalline 2D Materials by the coalescence of a few single crystalline domains. Finally, the current challenges and opportunities in future 2D Materials‘ synthesis are summarized.

Joon Seok Kim – One of the best experts on this subject based on the ideXlab platform.

  • A review on mechanics and mechanical properties of 2D Materials—Graphene and beyond
    Extreme Mechanics Letters, 2017
    Co-Authors: Deji Akinwande, Christopher J. Brennan, J. Scott Bunch, Philip Egberts, Jonathan R. Felts, Huajian Gao, Rui Huang, Joon Seok Kim
    Abstract:

    Since the first successful synthesis of graphene just over a decade ago, a variety of two-dimensional (2D) Materials (e.g., transition metal-dichalcogenides, hexagonal boron-nitride, etc.) have been discovered. Among the many unique and attractive properties of 2D Materials, mechanical properties play important roles in manufacturing, integration and performance for their potential applications. Mechanics is indispensable in the study of mechanical properties, both experimentally and theoretically. The coupling between the mechanical and other physical properties (thermal, electronic, optical) is also of great interest in exploring novel applications, where mechanics has to be combined with condensed matter physics to establish a scalable theoretical framework. Moreover, mechanical interactions between 2D Materials and various substrate Materials are essential for integrated device applications of 2D Materials, for which the mechanics of interfaces (adhesion and friction) has to be developed for the 2D Materials. Here we review recent theoretical and experimental works related to mechanics and mechanical properties of 2D Materials. While graphene is the most studied 2D material to date, we expect continual growth of interest in the mechanics of other 2D Materials beyond graphene.

  • A Review on Mechanics and Mechanical Properties of 2D Materials – Graphene and Beyond
    arXiv: Mesoscale and Nanoscale Physics, 2016
    Co-Authors: Deji Akinwande, Christopher J. Brennan, J. Scott Bunch, Philip Egberts, Jonathan R. Felts, Huajian Gao, Rui Huang, Joon Seok Kim
    Abstract:

    Since the first successful synthesis of graphene just over a decade ago, a variety of two-dimensional (2D) Materials (e.g., transition metal-dichalcogenides, hexagonal boron-nitride, etc.) have been discovered. Among the many unique and attractive properties of 2D Materials, mechanical properties play important roles in manufacturing, integration and performance for their potential applications. Mechanics is indispensable in the study of mechanical properties, both experimentally and theoretically. The coupling between the mechanical and other physical properties (thermal, electronic, optical) is also of great interest in exploring novel applications, where mechanics has to be combined with condensed matter physics to establish a scalable theoretical framework. Moreover, mechanical interactions between 2D Materials and various substrate Materials are essential for integrated device applications of 2D Materials, for which the mechanics of interfaces (adhesion and friction) has to be developed for the 2D Materials. Here we review recent theoretical and experimental works related to mechanics and mechanical properties of 2D Materials. While graphene is the most studied 2D material to date, we expect continual growth of interest in the mechanics of other 2D Materials beyond graphene.