A5047217925- Electron and X-Ray Spectroscopy Techniques
- Organic and Molecular Conductors Research
- Advanced Electron Microscopy Techniques and Applications
- Physics of Superconductivity and Magnetism
- Advanced Chemical Physics Studies
- Electronic and Structural Properties of Oxides
- High-pressure geophysics and materials
- Transition Metal Oxide Nanomaterials
- Surface and Thin Film Phenomena
- Advanced X-ray Imaging Techniques
- Magnetic and transport properties of perovskites and related materials
- Laser-Matter Interactions and Applications
- Advanced Memory and Neural Computing
- Quantum, superfluid, helium dynamics
- Topological Materials and Phenomena
- Mechanical and Optical Resonators
- Advanced Condensed Matter Physics
- Quantum many-body systems
- Crystal Structures and Properties
- Machine Learning in Materials Science
- Inorganic Fluorides and Related Compounds
- Neural Networks and Reservoir Computing
- 2D Materials and Applications
- Ga2O3 and related materials
- Chalcogenide Semiconductor Thin Films
Institute of Physics
2025
Chinese Academy of Sciences
2025
University of Chinese Academy of Sciences
2025
Argonne National Laboratory
2022-2023
Michigan State University
2015-2021
Michigan United
2020
Characterizing and understanding the emergence of multiple macroscopically ordered electronic phases through subtle tuning temperature, pressure, chemical doping has been a long-standing central issue for complex materials research. We report first comprehensive studies optical doping-induced stable metastable hidden visualized in situ by femtosecond electron crystallography. The phase transitions are triggered infrared pulses, temperature-optical density diagram is constructed substantiated...
Abstract Nonequilibrium phase transitions play a pivotal role in broad physical contexts, from condensed matter to cosmology. Tracking the formation of nonequilibrium phases requires resolution long-range cooperativity on ultra-short timescales. Here, we study spontaneous transformation charge-density wave CeTe 3 stripe order into bi-directional state inaccessible thermodynamically but is induced by intense laser pulses. With ≈100 fs coherent electron diffraction, capture entire course this...
We design and construct an ultrafast optical spectroscopy instrument that integrates both on-site in situ high-pressure technique low-temperature tuning capability. Conventional related instruments rely on off-site calibration of the high pressure. Recently, we have developed technique, which has advantage removing repositioning fluctuation. That only works at room temperature, greatly hampers its application to investigation correlated quantum materials. Here, further integrate low...
Abstract Photoinduced threshold switching processes that lead to bistability and the formation of metastable phases in photoinduced phase transition VO 2 are elucidated through ultrafast electron diffraction diffusive scattering techniques with varying excitation wavelengths. We uncover two distinct regimes dynamical change: a nearly instantaneous crossover into an intermediate state its decay led by lattice instabilities over 10 ps timescales. The structure this is identified be monoclinic,...
The interplay between a multitude of electronic, spin, and lattice degrees freedom underlies the complex phase diagrams quantum materials. Layer stacking in van der Waals (vdW) heterostructures is responsible for exotic electronic magnetic properties, which inspires control two-dimensional magnetism. Beyond order interlayer magnetism, we discover spin-shear coupling mechanism subtle shear atomic layers can have profound effect on intralayer family vdW antiferromagnets. Using time-resolved...
A frontier challenge in implementing femtosecond electron microscopy is to gain precise optical control of intense beams mitigate collective space charge effects for significantly improving the throughput. Here, we explore flexible uses an RF cavity as a longitudinal lens high-intensity beam column condensing both temporally and spectrally, relevant design ultrafast microscopy. Through introduction novel atomic grating approach characterization bunch phase optics, elucidate principles...
Strong spin-lattice coupling in van der Waals (vdW) magnets shows potential for innovative magneto-mechanical applications. Here, nanoscale and picosecond imaging by ultrafast electron microscopy reveal heterogeneous spin-mediated coherent acoustic phonon dynamics a thin-film cavity of the vdW antiferromagnet FePS3. The harmonics interlayer shear modes are observed, which even odd exhibit distinct nanoscopic dynamics. Corroborated wave simulation, role defects forming is elucidated. Above...
Nonequilibrium phase transition plays a pivotal role in broad physical context from condensed matter to cosmology. Tracking the formation of non-equilibrium phases is challenging and requires resolution long-range cooperativity on ultra-short timescales. Here, we study spontaneous symmetry breaking transformation charge-density wave system stripe into checkerboard state. Such state thermodynamically forbidden, but introduced through quench using ultrashort, intense laser pulses. The dynamics...
The advances of ultrafast imaging and spectroscopy technologies in the last decades have enabled a new perspective understanding fundamental processes at far from equilibrium. Ranging molecular systems to long-range-ordered electronic crystals, photo-driven transient decoupling between constituents, e.g. electronic, spin vibrational degrees freedom, allows interaction hierarchy be observed. These photoinduced nonequilibrium dynamics are not only central for complex interactions, but also may...