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Qin L, Yang P, Jin Q, Yang C, Zhang J, Yang Y. Real space method for HAADF image simulation. Micron 2024; 185:103686. [PMID: 38981387 DOI: 10.1016/j.micron.2024.103686] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2024] [Revised: 06/30/2024] [Accepted: 07/02/2024] [Indexed: 07/11/2024]
Abstract
A new real space HAADF simulation method was described in detail and a Real Space- STEM software was developed based on the new simulation method. The algorithm of the real space method can quickly calculate and simulate the microstructure images of complex crystals. The Real Space-STEM software developed in this paper has the functions of HRTEM and HAADF image simulation based on the real space method. By using this software to simulate high-resolution images of representative crystal materials from each crystal system, the HAADF images are both accurate and efficient. The effect of STEM parameters on HAADF imaging has been discussed using simulation results.
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Affiliation(s)
- Lufei Qin
- School of Materials Science and Engineering, Xiangtan University, Xiangtan, Hunan 411105, China
| | - Pucheng Yang
- School of Materials Science and Engineering, Xiangtan University, Xiangtan, Hunan 411105, China
| | - Qianqian Jin
- Materials Science and Engineering Research Center, Guangxi University of Science and Technology, Liuzhou 545006, China.
| | - Chuanlong Yang
- School of Materials Science and Engineering, Xiangtan University, Xiangtan, Hunan 411105, China
| | - Jinpeng Zhang
- School of Materials Science and Engineering, Xiangtan University, Xiangtan, Hunan 411105, China
| | - Yi Yang
- School of Materials Science and Engineering, Xiangtan University, Xiangtan, Hunan 411105, China.
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2
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Woods JM, Chand SB, Mejia E, Adhikari A, Taniguchi T, Watanabe K, Flick J, Grosso G. Emergent Optical Resonances in Atomically Phase-Patterned Semiconducting Monolayers of WS 2. ACS PHOTONICS 2024; 11:3784-3793. [PMID: 39310296 PMCID: PMC11413843 DOI: 10.1021/acsphotonics.4c00983] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/29/2024] [Revised: 08/02/2024] [Accepted: 08/06/2024] [Indexed: 09/25/2024]
Abstract
Atomic-scale control of light-matter interactions represents the ultimate frontier for many applications in photonics and quantum technology. Two-dimensional semiconductors, including transition-metal dichalcogenides, are a promising platform to achieve such control due to the combination of an atomically thin geometry and convenient photophysical properties. Here, we demonstrate that a variety of durable polymorphic structures can be combined to generate additional optical resonances beyond the standard excitons. We theoretically predict and experimentally show that atomic-sized patches of the 1T phase within the 1H matrix form unique electronic bands that lead to the emergence of robust optical resonances with strong absorption, circularly polarized emission, and long radiative lifetimes. The atomic manipulation of two-dimensional semiconductors opens unexplored scenarios for light harvesting devices and exciton-based photonics.
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Affiliation(s)
- John M. Woods
- Photonics
Initiative, Advanced Science Research Center, City University of New York, New York, New York 10031, United States
| | - Saroj B. Chand
- Photonics
Initiative, Advanced Science Research Center, City University of New York, New York, New York 10031, United States
| | - Enrique Mejia
- Photonics
Initiative, Advanced Science Research Center, City University of New York, New York, New York 10031, United States
| | - Ashok Adhikari
- Photonics
Initiative, Advanced Science Research Center, City University of New York, New York, New York 10031, United States
| | - Takashi Taniguchi
- International
Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
| | - Kenji Watanabe
- Research
Center for Functional Materials, National
Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
| | - Johannes Flick
- Center
for Computational Quantum Physics, Flatiron
Institute, New York, New York 10010, United States
- Department
of Physics, City College of New York, New York, New York 10031, United States
- Physics
Program,
Graduate Center, City University of New
York, New York New York 10016, United States
| | - Gabriele Grosso
- Photonics
Initiative, Advanced Science Research Center, City University of New York, New York, New York 10031, United States
- Physics
Program,
Graduate Center, City University of New
York, New York New York 10016, United States
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Lee M, Lee SY, Kang MH, Won TK, Kang S, Kim J, Park J, Ahn DJ. Observing growth and interfacial dynamics of nanocrystalline ice in thin amorphous ice films. Nat Commun 2024; 15:908. [PMID: 38291035 PMCID: PMC10827800 DOI: 10.1038/s41467-024-45234-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2023] [Accepted: 01/16/2024] [Indexed: 02/01/2024] Open
Abstract
Ice crystals at low temperatures exhibit structural polymorphs including hexagonal ice, cubic ice, or a hetero-crystalline mixture of the two phases. Despite the significant implications of structure-dependent roles of ice, mechanisms behind the growths of each polymorph have been difficult to access quantitatively. Using in-situ cryo-electron microscopy and computational ice-dynamics simulations, we directly observe crystalline ice growth in an amorphous ice film of nanoscale thickness, which exhibits three-dimensional ice nucleation and subsequent two-dimensional ice growth. We reveal that nanoscale ice crystals exhibit polymorph-dependent growth kinetics, while hetero-crystalline ice exhibits anisotropic growth, with accelerated growth occurring at the prismatic planes. Fast-growing facets are associated with low-density interfaces that possess higher surface energy, driving tetrahedral ordering of interfacial H2O molecules and accelerating ice growth. These findings, based on nanoscale observations, improve our understanding on early stages of ice formation and mechanistic roles of the ice interface.
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Affiliation(s)
- Minyoung Lee
- School of Chemical and Biological Engineering, and Institute of Chemical Processes, Seoul National University, Seoul, 08826, Republic of Korea
- Center for Nanoparticle Research, Institute of Basic Science (IBS), Seoul, 08826, Republic of Korea
| | - Sang Yup Lee
- Department of Chemical and Biological Engineering, Korea University, Seoul, 02841, Republic of Korea
- KU-KIST Graduate school of Converging Science and Technology, Korea University, Seoul, 02841, Republic of Korea
- The w:i Interface Augmentation Center, Korea University, Seoul, 02841, Republic of Korea
| | - Min-Ho Kang
- Department of Biomedical-Chemical Engineering, The Catholic University of Korea, Bucheon-si, 14662, Republic of Korea
- Department of Biotechnology, The Catholic University of Korea, Bucheon-si, 14662, Republic of Korea
| | - Tae Kyung Won
- Department of Chemical and Biological Engineering, Korea University, Seoul, 02841, Republic of Korea
- The w:i Interface Augmentation Center, Korea University, Seoul, 02841, Republic of Korea
| | - Sungsu Kang
- School of Chemical and Biological Engineering, and Institute of Chemical Processes, Seoul National University, Seoul, 08826, Republic of Korea
- Center for Nanoparticle Research, Institute of Basic Science (IBS), Seoul, 08826, Republic of Korea
| | - Joodeok Kim
- School of Chemical and Biological Engineering, and Institute of Chemical Processes, Seoul National University, Seoul, 08826, Republic of Korea
- Center for Nanoparticle Research, Institute of Basic Science (IBS), Seoul, 08826, Republic of Korea
| | - Jungwon Park
- School of Chemical and Biological Engineering, and Institute of Chemical Processes, Seoul National University, Seoul, 08826, Republic of Korea.
- Center for Nanoparticle Research, Institute of Basic Science (IBS), Seoul, 08826, Republic of Korea.
- Institute of Engineering Research, College of Engineering, Seoul National University, Seoul, 08826, Republic of Korea.
- Advanced Institutes of Convergence Technology, Seoul National University, Suwon-si, 16229, Republic of Korea.
| | - Dong June Ahn
- Department of Chemical and Biological Engineering, Korea University, Seoul, 02841, Republic of Korea.
- KU-KIST Graduate school of Converging Science and Technology, Korea University, Seoul, 02841, Republic of Korea.
- The w:i Interface Augmentation Center, Korea University, Seoul, 02841, Republic of Korea.
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Milligan G, Yao ZF, Cordova DLM, Tong B, Arguilla MQ. Single Quasi-1D Chains of Sb 2Se 3 Encapsulated within Carbon Nanotubes. CHEMISTRY OF MATERIALS : A PUBLICATION OF THE AMERICAN CHEMICAL SOCIETY 2024; 36:730-741. [PMID: 38282683 PMCID: PMC10809716 DOI: 10.1021/acs.chemmater.3c02114] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/21/2023] [Revised: 12/27/2023] [Accepted: 12/28/2023] [Indexed: 01/30/2024]
Abstract
The realization of stable monolayers from 2D van der Waals (vdW) solids has fueled the search for exfoliable crystals with even lower dimensionalities. To this end, 1D and quasi-1D (q-1D) vdW crystals comprising weakly bound subnanometer-thick chains have been discovered and demonstrated to exhibit nascent physics in the bulk. Although established micromechanical and liquid-phase exfoliation methods have been applied to access single isolated chains from bulk crystals, interchain vdW interactions with nonequivalent strengths have greatly hindered the ability to achieve uniform single isolated chains. Here, we report that encapsulation of the model q-1D vdW crystal, Sb2Se3, within single-walled carbon nanotubes (CNTs) circumvents the relatively stronger c-axis vdW interactions between the chains and allows for the isolation of single chains with structural integrity. High-resolution transmission electron microscopy and selected area electron diffraction studies of the Sb2Se3@CNT heterostructure revealed that the structure of the [Sb4Se6]n chain is preserved, enabling us to systematically probe the size-dependent properties of Sb2Se3 from the bulk down to a single chain. We show that ensembles of the [Sb4Se6]n chains within CNTs display Raman confinement effects and an emergent band-like absorption onset around 600 nm, suggesting a strong blue shift of the near-infrared band gap of Sb2Se3 into the visible range upon encapsulation. First-principles density functional theory calculations further provided qualitative insight into the structures and interactions that could manifest in the Sb2Se3@CNT heterostructure. Spatial visualization of the calculated electron density difference map of the heterostructure indicated a minimal degree of electron donation from the host CNT to the guest [Sb4Se6]n chain. Altogether, this model system demonstrates that 1D and q-1D vdW crystals with strongly anisotropic vdW interactions can be precisely studied by encapsulation within CNTs with suitable diameters, thereby opening opportunities in understanding dimension-dependent properties of a plethora of emergent vdW solids at or approaching the subnanometer regime.
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Affiliation(s)
- Griffin
M. Milligan
- Department
of Chemistry, University of California Irvine, Irvine, California 92697, United States
| | - Ze-Fan Yao
- Department
of Chemistry, University of California Irvine, Irvine, California 92697, United States
- Department
of Chemical and Biomolecular Engineering, University of California Irvine, Irvine, California 92697, United States
| | | | - Baixin Tong
- Department
of Chemistry, University of California Irvine, Irvine, California 92697, United States
| | - Maxx Q. Arguilla
- Department
of Chemistry, University of California Irvine, Irvine, California 92697, United States
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Mendis BG. A "Phase Scrambling" Algorithm for Parallel Multislice Simulation of Multiple Phonon and Plasmon Scattering Configurations. MICROSCOPY AND MICROANALYSIS : THE OFFICIAL JOURNAL OF MICROSCOPY SOCIETY OF AMERICA, MICROBEAM ANALYSIS SOCIETY, MICROSCOPICAL SOCIETY OF CANADA 2023; 29:1111-1123. [PMID: 37749702 DOI: 10.1093/micmic/ozad052] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/14/2023] [Revised: 03/05/2023] [Accepted: 04/16/2023] [Indexed: 09/27/2023]
Abstract
Multislice simulations of 4D scanning transmission electron microscopy (4D STEM) data are computationally demanding due to the large number of STEM probe positions that must be calculated. For accurate analysis, inelastic scattering from phonons and plasmons must also be included. However, current frozen phonon and Monte Carlo plasmon techniques require a separate calculation for each different phonon/plasmon configuration, and are therefore not suitable for scaling up to 4D STEM. Here a phase scrambling algorithm (PSA) is proposed, which treats all phonon/plasmon configurations simultaneously. A random phase is introduced to maintain incoherence between the different inelastic scattering events; this is the phase scrambling part of the algorithm. While for most applications, a few tens of frozen phonon iterations are sufficient for convergence, in the case of plasmon scattering as many as tens of thousands of iterations may be required. A PSA is statistically more representative of inelastic scattering, and achieves significant savings in computation time for plasmons. The increase in speed is a pre-requisite for 4D STEM inelastic scattering simulations.
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Affiliation(s)
- B G Mendis
- Department of Physics, Durham University, South Road, Durham DH1 3LE, UK
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