Article
Chemistry, Physical
K. Tsuchikusa, K. Yamamoto, M. Katsura, C. T. de Paula, J. A. C. Modesto, S. Dorbolo, F. Pacheco-Vazquez, Y. D. Sobral, H. Katsuragi
Summary: This study investigates the relationship between bidispersity and disorder degree of particle configuration. By introducing bidispersity through magnetic dipole-dipole interaction, the particle system is compressed to obtain a uniform particle arrangement. The disorder degree is evaluated using Voronoi tessellation. The results show that the peak of standard deviation occurs when the numbers of large and small particles are equal and zero skewness can be achieved when the numbers are identical. The analysis also reveals the relationship between Voronoi cell analysis and the global bond orientational order parameter.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Rui Li, Jiawei Jiang, Wenbo Mi, Haili Bai
Summary: The study reveals that the FeClBr monolayer exhibits spontaneous valley polarization and valley splitting, making it suitable for practical applications in valleytronics. The valley degree of freedom of the FeClBr monolayer can be modulated by circularly polarized light and linear light.
Article
Chemistry, Multidisciplinary
Alexandra Brumberg, Matthew S. Kirschner, Benjamin T. Diroll, Kali R. Williams, Nathan C. Flanders, Samantha M. Harvey, Ariel A. Leonard, Nicolas E. Watkins, Cunming Liu, Eli D. Kinigstein, Jin Yu, Austin M. Evans, Yuzi Liu, Shelby A. Cuthriell, Shobhana Panuganti, William R. Dichtel, Mercouri G. Kanatzidis, Michael R. Wasielewski, Xiaoyi Zhang, Lin X. Chen, Richard D. Schaller
Summary: Time-resolved X-ray diffraction study reveals that photoexcitation induces greater out-of-plane disordering in 4 and 5 monolayer NPLs, while 3 ML NPLs display the opposite behavior. In comparison, disordering in zero-dimensional CdSe nanocrystals is isotropic and recovery is faster. These findings support the superior performance of NPLs in optoelectronic applications.
Article
Chemistry, Multidisciplinary
Hou-Yi Lyu, Xing-Yu Ma, Kuan-Rong Hao, Zhen-Gang Zhu, Qing-Bo Yan, Gang Su
Summary: This study discovered unexpected spontaneous symmetry breaking in some 2D MPX3 materials, leading to enhanced structural stability, broken inversion symmetry, and the emergence of ferroelectricity or ferroelasticity. By systematically investigating the family of 2D MPX3, the study identified 34 members that undergo such symmetry breaking. The results reveal that the mismatch between the P-P dimer lattice and the M atom lattice, as well as the variable accommodation of P lone-pair electrons in different valence states of M atoms, play dominant roles in the inversion symmetry breaking and the emergence of ferroicity.
Article
Nanoscience & Nanotechnology
Fei Zheng, Thomas Raeber, Sergey Rubanov, Calvin Lee, Aaron Seeber, Christopher Hall, Trevor A. Smith, Mei Gao, Dechan Angmo, Kenneth P. Ghiggino
Summary: This study reveals the spontaneous formation of a self-assembled butylammonium ligand capping layer on the top surface of a quasi-2D perovskite film and explains the assembly and vertical orientation of RPPs in the film, which is crucial for the performance of 2D perovskite solar cells. These findings provide important insights for the development of high-performance perovskite solar cells and other solid-state electronic devices.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
A. K. Nair, S. J. Ray
Summary: By studying the electronic and magnetic behavior of 2-dimensional material Cr2Ge2Te6, the impact of strain and electric field on the material properties was revealed. Coupling strain and electric field led to a significant increase in Curie temperature, which could have significant implications in the development of 2D spintronic architecture.
Article
Multidisciplinary Sciences
Sichi Li, Harini Gunda, Keith G. Ray, Chun-Shang Wong, Penghao Xiao, Raymond W. Friddle, Yi-Sheng Liu, ShinYoung Kang, Chaochao Dun, Joshua D. Sugar, Robert D. Kolasinski, Liwen F. Wan, Alexander A. Baker, Jonathan R. I. Lee, Jeffrey J. Urban, Kabeer Jasuja, Mark D. Allendorf, Vitalie Stavila, Brandon C. Wood
Summary: Layered boron compounds have attracted significant interest in applications due to their diverse surface properties tied to specific arrangements of boron atoms. This work utilizes first-principles calculations and global optimization to reveal the disordering and clustering of boron atoms on the outer surface of MgB2 nanosheets, which is experimentally confirmed. The findings suggest that multiple disordered reconstructions are thermodynamically preferred and accessible on exposed B surfaces in MgB2 and other layered metal diborides, providing new opportunities for the realization of diverse 2D boron structures.
NATURE COMMUNICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Mingzhu Liu, Xiaolong Zheng, Veronica Grebe, Mingxin He, David J. Pine, Marcus Weck
Summary: This study successfully achieved different morphologies of colloidal superstructures by tuning the particles' patch sizes and assembly conditions, proposing an empirical phase diagram that provides guidance in designing two-dimensional materials with desired superstructures. Our strategy may be applicable to the assembly of three-dimensional colloidal structures.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Physics, Applied
Puja Kumari, Tania Mukherjee, Subhasmita Kar, S. J. Ray
Summary: In this study, the electronic and magnetic properties of a magnetic van der Waals nanocrystals VClBr2 were investigated using spin-polarized density functional theory calculations. Different strategies were employed to adjust the material properties without altering the chemical composition or introducing defects. Under strain and electric field, a phase transition from semiconducting to metallic and half-metallic phases with ferromagnetic and antiferromagnetic ground states was observed. Monte-Carlo simulation predicted a significant increase in Curie temperature (T-c) by approximately 6700% under an electric field of E-z = 2.5 V/nm. The material also exhibited in-plane easy axis and strain-dependent modulation of magnetic anisotropy energy, making it promising for applications in electric field driven spin gating, room temperature spintronics, and 2D spin circuit design.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Chemistry, Physical
Xintao Zhu, Fu Wang, Dexin Ma
Summary: In this study, Bridgman casting experiments were conducted to investigate the physical processes in 2D grain selectors with different geometric parameters. The effects of the geometric parameters on grain selection were quantified using optical microscopy (OM) and scanning electron microscopy (SEM) equipped with electron backscatter diffraction (EBSD) function. The study discusses the influences of the geometric parameters and proposes an underlying mechanism to explain the experimental results. The critical nucleation undercooling during grain selection in the 2D grain selectors is also analyzed.
Article
Chemistry, Multidisciplinary
Subham Ranjan, Satoshi Takamizawa
Summary: In this work, two-dimensional ferroelasticity in 4-iodoaniline was observed under external stress, as investigated by force measurement and single-crystal X-ray diffraction techniques at macroscopic and microscopic levels.
CRYSTAL GROWTH & DESIGN
(2022)
Article
Physics, Multidisciplinary
A. Shuvaev, V. M. Muravev, P. A. Gusikhin, J. Gospodaric, A. Pimenov, I. Kukushkin
Summary: The experimental discovery of superluminal electromagnetic 2D plasma waves in a high-quality GaAs/AlGaAs two-dimensional electron system on a dielectric substrate is reported. The study shows a strong hybridization between plasma and Fabry-Perot light modes at large two-dimensional densities, and the plasma resonance split into two modes in the presence of a perpendicular magnetic field, each corresponding to a specific sense of circular polarization. The experimental results are in good agreement with the theory.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Jun Ding, Ding-Fu Shao, Ming Li, Li-Wei Wen, Evgeny Y. Tsymbal
Summary: The recent discovery of two-dimensional ferroelectric materials has opened up a new route for realizing tunnel junctions with new functionalities and nanoscale dimensions. Using first-principles calculations, it has been demonstrated that bilayer In2X3 barriers exhibit stable ferroelectric and antiferroelectric states separated by sizable energy barriers, enabling nonvolatile switching between these states. Quantum-mechanical modeling predicts giant tunneling electroresistance effects and multiple nonvolatile resistance states in 2D AFTJs, suggesting the potential for high-density nanoscale memory devices.
PHYSICAL REVIEW LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Yuqiong Huang, Hao Luo, Baohao Zhang, Kuo Su, Wentao Chen, Guomin Sui, Lusheng Liang, Bao Zhang, Jian Song, Peng Gao
Summary: Passivation of bulk 3D perovskite films using inlaid 1D or 2D perovskite phases from the same organic spacer was demonstrated. The formation of two low-dimensional chiral perovskite phases resulted in reduced defect-assisted recombination and improved energy level alignment. The 2D perovskite phase showed higher efficiency as a passivator compared to the 1D perovskite phase.
APPLIED MATERIALS TODAY
(2022)
Article
Chemistry, Physical
Katarzyna Posmyk, Natalia Zawadzka, Mateusz Dyksik, Alessandro Surrente, Duncan K. Maude, Tomasz Kazimierczuk, Adam Babinski, Maciej R. Molas, Watcharaphol Paritmongkol, Miroslaw Maczka, William A. Tisdale, Paulina Plochocka, Michal Baranowski
Summary: This study reveals the exciton fine structure of (PEA)2PbI4 single crystals using low temperature magneto-optical spectroscopy and provides valuable quantification of the fine structure splitting in (PEA)2PbI4. The results support the standard multiband, effective-mass theories for the exciton fine structure in 2D perovskites.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
