Hao Zeng

University at Buffalo, State University of New York

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Renat Sabirianov

University of Nebraska at Omaha

Fan Sun

China Jiliang University

Shouheng Sun

Brown University

Hui Xing

Shanghai Jiao Tong University

Xiaohong Xu

Shanxi Normal University

Zhong Lin Wang

Georgia Institute of Technology

Jianwei Miao

California NanoSystems Institute

Shengbai Zhang

Rensselaer Polytechnic Institute

Yi‐Yang Sun

Chinese Academy of Sciences

Haolei Hui

University at Buffalo, State University of New York

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Chinese Academy of Sciences

180

University at Buffalo, State University of New York

154

University of Chinese Academy of Sciences

Xi'an Jiaotong University

Institute of High Energy Physics

University of Science and Technology of China

Peking University

Central South University

Shanghai Jiao Tong University

Zhejiang University

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Growth mechanism of largescale MoS₂monolayer by sulfurization of MoO₃film

Materials Research Express (2016)

Payam Taheri Jieqiong Wang Hui Xing Joel F. Destino M. Arik

Monolayer two-dimensional transition metal dichalcogenides (TMDCs) such as MoS2 with broken inversion symmetry possesses two degenerate yet inequivalent valleys that can be selectively excited by circularly polarized light. This unique property renders interesting valley physics. The ability to manipulate valley degrees of freedom with light or external field makes them attractive for optoelectronic and spintronic applications. There is great demand for large area monolayer (ML) TMDCs for certain measurements and device applications. Recent reports on large area ML TDMCs focus on chemical vapor deposition growth. In this work, we report a facile approach to grow largescale continuous ML MoS2 nearly free of overgrowth and voids, by sulfurizing evaporated molybdenum trioxide ultrathin films. Photo conductivity scales with device sizes up to 4.5 mm, suggesting excellent film uniformity. The growth mechanism is found to be vaporization, diffusion, sulfurization and lateral growth, all at local micrometer scale. Our approach provides a new pathway for large-area ML TMDC growth and lithography-free device fabrication.

10.1088/2053-1591/3/7/075009

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Citations (45)

Emergent order in the spin-frustrated systemDyxTb2−xTi2O7

Physical Review B (2010)

Hui Xing Mi He Chunmu Feng Hanjie Guo Hao Zeng

We report the a.c. susceptibility study of Dy_xTb_{2-x}Ti_2O_7 with x in [0, 2]. In addition to the single-ion effect at Ts (single-ion effect peak temperature) corresponding to the Dy3+ spins as that in spin ice Dy_2Ti_2O_7 and a possible spin freezing peak at Tf (Tf < 3 K), a new peak associated with Tb^{3+} is observed in $\chi_{ac}(T)$ at nonzero magnetic field with a characteristic temperature T^* (Tf < T^* < Ts). T^* increases linearly with x in a wide composition range (0 < x < 1.5 at 5 kOe). Both application of a magnetic field and increasing doping with Dy3+ enhance T^*. The T^* peak is found to be thermally driven with an unusually large energy barrier as indicated from its frequency dependence. These effects are closely related to the crystal field levels, and the underlying mechanism remains to be understood.

10.1103/physrevb.81.134426

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Citations (15)

Leakage current simulations of Low Gain Avalanche Diode with improved Radiation Damage Modeling

Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment (2022)

Tao Yang Kewei Wu Mei Zhao Xuewei Jia Yuhang Tan

radiation damage

Single-photon avalanche diode

Leakage (economics)

10.1016/j.nima.2022.167111

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Citations (4)

Neuroimaging of six neurosyphilis cases mimicking viral encephalitis

Journal of the Neurological Sciences (2013)

Tao Xiang Guoliang Li Lan Xiao Si Chen Hao Zeng

Neurosyphilis

Viral encephalitis

10.1016/j.jns.2013.08.019

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Citations (17)

Capturing the Atomic Coordinates of Surface and Subsurface Structure in 4D with Atomic Electron Tomography

Microscopy and Microanalysis (2020)

Jihan Zhou Yongsoo Yang Yao Yang Colin Ophus Fan Sun

The atomic arrangement of surface/subsurface structure is critical for many applications ranging from catalysis and electronics to biosensing and targeted delivery [1].Currently, there are several surface structure analysis methods, including electron scattering, X-ray scattering, spectroscopic methods and scanning probe microscopy such as atomic force microscopy (AFM) and scanning tunneling microscopy (STM) [2].AFM and STM can provide a real-space mapping of surface atoms with sub-atomic resolution.However, the 3D atomic coordinates of the surface and especially subsurface cannot be easily accessed by those methods.Over the past few years, in a combination of the state-of-the-art electron microscopy, powerful 3D reconstruction and atom tracing algorithms, a groundbreaking method, termed atomic electron tomography (AET) [3], has been developed to determine the 3D atomic structures, including surface and subsurface atomic structures, of nanomaterials without the assumption of crystallinity [4][5][6][7].More recently, we established a state-of-art data acquisition method to add a new dimension (time) to AET (i.e.4D-AET) to study early stage nucleation dynamics in solid-solid phase transitions [8].Using an iron-platinum (FePt) nanoparticle as a model system, we advanced AET to capture how the surface atoms rearrange during early nucleation at 4D atomic resolution.By annealing the same FePt nanoparticle at 520 °C in vacuum at different annealing times, we obtained a sequential series of three models of the same particle with an accumulated annealing time of 9, 16 and 26 minutes, respectively.The surface and subsurface atomic positions and chemical ordering information with a 3D precision of 26 picometers is shown in Fig. 1.All the nuclei are situated on the surface or subsurface.Most nucleation sites are located on the facets, edges or corners (Fig. 2).This experiment adds a new dimension (time) to AET, allowing the observation of time evolution of structure in materials in four atomic dimensions, which is currently not accessible by any other experimental methods.We anticipate that AET will play a key role in helping to solve some fundamental problems in materials science, nanoscience, condensed-matter physics, and chemistry [9].

Atomic model

10.1017/s1431927620019364

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Atomic Resolution Tomography of Magnetically Anisotropic FePt Nanoparticles

Microscopy and Microanalysis (2014)

Mary Scott Che-Yang Chen Hao Zeng Peter Ercius John Miao

Journal Article Atomic Resolution Tomography of Magnetically Anisotropic FePt Nanoparticles Get access Mary Scott, Mary Scott Department of Physics & Astronomy and California NanoSystems Institute, University of California, Los Angeles, CA 90095, USA Search for other works by this author on: Oxford Academic Google Scholar C-C Chen, C-C Chen Department of Physics & Astronomy and California NanoSystems Institute, University of California, Los Angeles, CA 90095, USA Search for other works by this author on: Oxford Academic Google Scholar Hao Zeng, Hao Zeng Department of Physics, University at Buffalo, the State University of New York, Buffalo, New York 14260, USA Search for other works by this author on: Oxford Academic Google Scholar Peter Ercius, Peter Ercius National Center for Electron Microscopy, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA Search for other works by this author on: Oxford Academic Google Scholar John Miao John Miao Department of Physics & Astronomy and California NanoSystems Institute, University of California, Los Angeles, CA 90095, USA Search for other works by this author on: Oxford Academic Google Scholar Microscopy and Microanalysis, Volume 20, Issue S3, 1 August 2014, Pages 804–805, https://doi.org/10.1017/S1431927614005741 Published: 27 August 2014

National laboratory

10.1017/s1431927614005741

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Citations (1)

Bifunctional Magneto-Optical FePt−CdS Hybrid Nanoparticles

The Journal of Physical Chemistry C (2008)

Shuli He Hongwang Zhang Savas Delikanli Yueling Qin Mark T. Swihart

This paper describes preparation of binary FePt−CdS hybrid nanoparticles by spontaneous heteroepitaxial nucleation and growth of the CdS component onto FePt-seed nanoparticles in high-temperature organic solution. FePt nanoparticles with average sizes of 4 and 9 nm were used as seeds. Lattice mismatch makes complete coating of the seed particles unfavorable, resulting in peanut-like and flower-like FePt−CdS nanoparticles. The CdS photoluminescence is quenched in 9 nm FePt−CdS hybrid nanoparticles. The band edge emission is observed in 4 nm FePt−CdS nanoparticles, albeit with substantially lower intensity than in pure CdS nanoparticles. We suggest that the strong FePt-size dependent photoluminescence intensity results from the interplay between interface charge transfer and quantum confinement effects.

10.1021/jp806247f

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Citations (60)

Signature of Electron-magnon Umklapp Scattering in L10 FePt probed by Thermoelectric Measurements

arXiv (Cornell University) (2013)

Xiaoxian Yan Chang Huai Hui Xing James P. Parry Yusen Yang

We report unconventional thermoelectric power (Seebeck coefficient, S) in L10 structured FePt films. The temperature dependence of S can be well fitted by a phenomenological expression consisting of electron diffusion and magnon-drag contributions. Interestingly, the magnon drag coefficient carries an opposite sign to that of electron diffusion, revealing a dominant contribution from the elusive electron-magnon Umklapp scattering. DFT calculations identify several bands crossing the Brillouin zone boundaries, facilitating the Umklapp process. The large spin-orbit coupling in FePt results in strong mixing of majority and minority spins among some of those bands, greatly enhancing the electron-magnon scattering.

Magnon

10.48550/arxiv.1312.1634

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Metal precursor with bi-layer indium for Cu(In,Ga)Se2 thin film preparation

Solar Energy Materials and Solar Cells (2016)

Jun Tong Hao Zeng Qiuming Song Zhu‐An Xu Chunlei Yang

Thin layers

10.1016/j.solmat.2016.02.008

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Citations (3)

Surface Induced Suppression of Magnetization and Surface magnetization Reversal in Magnetic Nanoparticles

APS March Meeting Abstracts (2010)

Chaehyun Kim Wei‐Jen Lai Renat Sabirianov Yuhang Ren Hao Zeng

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