Dr. Longlong Wu is a professor at the Shanghai Advanced Research Institute, Chinese Academy of Sciences. He applies coherent X-ray methods and machine learning to the development of high-resolution imaging methods and the defect detection of funtional material and devices. His research focuses on using Bragg coherent X-ray diffraction imaging techniques (i.e., Bragg CDI, Bragg Ptychography) to study the magnetic domain structure and dynamics of correlated materials. He also works on the development of high-performance algorithms for these imaging methods and applying them to study the microstructure of materials. His previous experience was in using surface X-ray scattering techniques (i.e., GISAXS) to study the structure and dynamical phenomena of soft materials on surfaces.

Extensive experience with coherent X-ray diffraction experiments at synchrotron light sources/X-ray free-electron laser facilities, as well as scientific programming for high-performance simulations, automated experiments, and big data analysis.

Scientific experience in: 

• Bragg Coherent X-ray Diffraction;

• Ptychography, Bragg Ptychography, Ptychographic tomography;

• SAXS, GISAXS, ultrafast PDF, XRD;

• Machine learning;

• Multi-modal scanning probe microscopy.

Education

2014-2019, Ph.D. in Materials Physics and Chemistry, University of Chinese Academy of Sciences, CN

2010-2014, B.S. in Applied Physics, University of Shanghai for Science and Technology, CN

Professional Appointments

2024-Present, Professor, Shanghai Advanced Research Institute‌, Shanghai, CN             

2021-2024, Research Staff, Brookhaven National Laboratory, Upton, USA

2019-2021, Postdoctoral Research Associate, Brookhaven National Laboratory, Upton, USA

（1） Low-temperature state in strontium titanate microcrystals using multireflection Bragg coherent x-ray diffraction imaging, Physical Review B, 2025

（2） Electronic Melting of Silicon in Nanostructures using X-ray Forbidden Bragg Reflections, JOURNAL OF ELECTRONIC MATERIALS, 2025

（3） Dose-efficient automatic differentiation for ptychographic reconstruction, OPTICA, 2024

（4） Resolving length-scale-dependent transient disorder through an ultrafast phase transition, Nature Materials, 2024

（5） Suppressing strain propagation in ultrahigh-Ni cathodes during fast charging via epitaxial entropy-assisted coating, NATURE ENERGY, 2024

（6） Ultrafast Bragg coherent diffraction imaging of epitaxial thin films using deep complex-valued neural networks, NPJ COMPUTATIONAL MATERIALS, 2024

（7） Behavior of strain stripe networks in barium titanate nanocrystals on crossing its ferroelectric phase transition, PHYSICAL REVIEW MATERIALS, 2024

（8） Ptychography Based Resolution-enhanced X-ray Fluorescence Microscopy Using Deep Neural Networks, ACTA CRYSTALLOGRAPHICA A-FOUNDATION AND ADVANCES, 2023

（9） Compressive effects in melting of palladium thin films studied by ultrafast x-ray diffraction, PHYSICAL REVIEW B, 2023

（10） Resolution-enhanced X-ray fluorescence microscopy via deep residual networks, Resolution-enhanced X-ray fluorescence microscopy via deep residual networks, NPJ COMPUTATIONAL MATERIALS, 2023

（11） Structural Explanation of the Dielectric Enhancement of Barium Titanate Nanoparticles Grown under Hydrothermal Conditions, ADVANCED FUNCTIONAL MATERIALS, 2023

（12） Anisotropy of antiferromagnetic domains in a spin-orbit Mott insulator, PHYSICAL REVIEW B, 2023

（13） Integrating AlphaFold and deep learning for atomistic interpretation of cryo-EM maps, BRIEFINGS IN BIOINFORMATICS, 2023

（14） Correlative imaging with multi-modal scanning probe microscopy, ACTA CRYSTALLOGRAPHICA A-FOUNDATION AND ADVANCES, 2023

（15） Three-dimensional strain imaging of irradiated chromium using multi-reflection Bragg coherent diffraction, NPJ MATERIALS DEGRADATION, 2022

（16） Real Space Imaging of Spin Stripe Domain Fluctuations in a Complex Oxide, PHYSICAL REVIEW LETTERS, 2021

（17） Machine Learning approach to the phase problem in Bragg Coherent Diffraction Imaging, ACTA CRYSTALLOGRAPHICA A-FOUNDATION AND ADVANCES, 2021

（18） Structure of a seeded palladium nanoparticle and its dynamics during the hydride phase transformation, COMMUNICATIONS CHEMISTRY, 2021

（19） Three-dimensional coherent X-ray diffraction imaging via deep convolutional neural networks, Three-dimensional coherent X-ray diffraction imaging via deep convolutional neural networks, NPJ COMPUTATIONAL MATERIALS, 2021

（20） Imaging the Phase Transformation in Single Particles of the Lithium Titanate Anode for Lithium-Ion Batteries, ACS APPLIED ENERGY MATERIALS, 2021

（21） Complex imaging of phase domains by deep neural networks, IUCRJ, 2021

（22） Precise Fabrication of De Novo Nanoparticle Lattices on Dynamic 2D Protein Crystalline Lattices, NANO LETTERS, 2020

（23） Improving efficiency and stability of colorful perovskite solar cells with two-dimensional photonic crystals, NANOSCALE, 2020

（24） Evolution of ferroelastic domain walls during phase transitions in barium titanate nanoparticles, PHYSICAL REVIEW MATERIALS, 2020

（25） Strain and Electronic Nematicity in La2-xSrxCuO4, JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM, 2020

（26） In Situ Observation of Crystallization Dynamics and Grain Orientation in Sequential Deposition of Metal Halide Perovskites, ADVANCED FUNCTIONAL MATERIALS, 2019

（27） Dynamic Crystallization and Phase Transition in Evaporating Colloidal Droplets, NANO LETTERS, 2019

（28） Experimental evidence for x-ray standing wave modulated surface scattering effect, APPLIED PHYSICS LETTERS, 2019

（29） In Situ Real-Time Study of the Dynamic Formation and Conversion Processes of Metal Halide Perovskite Films, ADVANCED MATERIALS, 2018

（30） In situ X-ray scattering observation of two-dimensional interfacial colloidal crystallization, Nature Communications, 2018

（31） Real-Time Probing of Nanowire Assembly Kinetics at the Air-Water Interface by In Situ Synchrotron X-Ray Scattering, ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 2018

（32） Controllable Formation of Efficient CuSe Counter Electrodes for Quantum Dot Sensitized Solar Cells, JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 2017

（33） Wide-angle polarization-free plasmon-enhanced light absorption in perovskite films using silver nanowires, OPTICS EXPRESS, 2017

（34） Mesoporous Silica Thin Membranes with Large Vertical Mesochannels for Nanosize-Based Separation, ADVANCED MATERIALS, 2017

（35） X-ray standing wave enhanced scattering from mesoporous silica thin films, APPLIED PHYSICS LETTERS, 2017

（36） X-ray and optical characterizations of DNA-mediated Janus nanostructures, APPLIED PHYSICS LETTERS, 2016

（37） Structural and optical control of DNA-mediated Janus plasmonic nanostructures, NANOSCALE, 2016

（38） Two-Dimensional Organic-Inorganic Hybrid Perovskite Photonic Films, NANO LETTERS, 2016