The main research directions of the research group:

1. Research on spectroscopy and optoelectronic properties of low-dimensional materials

• Controlling the Quasiparticle Behavior of Two-Dimensional Magnetic Materials

Through variable temperature and magnetic field spectroscopy (such as Raman spectroscopy), the frequency and behavior of quasiparticles such as magnons and their interactions can be observed and controlled, and the microscopic mechanism of quasiparticle behavior can be accurately understood.

• Photoelectric response of two-dimensional semiconductor materials

By regulating the band gap of semiconductor materials through electric fields, photoluminescence spectroscopy is used to detect and clarify the key factors affecting the photoelectric response and band gap transition of two-dimensional semiconductor materials

• Multi-field control near-field optical imaging

Characterize and regulate the behavior of surface polaritons in metallic materials, semiconductor materials, and insulating materials by using variable temperature strong magnetic fields and applied electric fields, and analyze their coupling and propagation mechanisms under multi-field regulation

• Ultrafast dynamics of condensed matter systems

Through ultrafast laser systems, we study carrier dynamics (measure carrier lifetime, thermal cooling process, etc. through pump detection), exciton dynamics and coupling (observe various characteristics of excitons, interface charge transfer and device carrier efficiency and speed in two-dimensional materials and heterojunctions), and transient behaviors of excitons under external field control (combined with gate voltage to study the regulation of external fields on excitons, energy levels, and optical selection rules).

Time-resolved fluorescence kinetics and energy transfer studies

Fluorescence lifetime imaging can provide information on molecular environment, exciton recombination dynamics and two-dimensional material defects, observe heterojunction energy/charge transfer and complement transient absorption, and simultaneously provide confocal spatial resolution imaging to analyze the fluorescence characteristics of the sample surface.

• Research on magnon dynamics and spin wave properties

By analyzing the magnetic field/temperature-dependent spin wave frequency, key dynamic parameters such as magnetic anisotropy field, exchange stiffness and Gilbert damping coefficient can be quantified. With its wave vector resolution and micron-level spatial resolution, this technology can simultaneously obtain the energy, lifetime and dispersion relation of the magnetic oscillator, breaking through the limitation of traditional ferromagnetic resonance that only detects uniform modes.

• Momentum space photon-matter coupling and band structure research

By characterizing the angle-resolved reflectivity spectrum and angle-resolved photoluminescence spectrum and analyzing the behavior of photons in momentum space, we can detect the dispersion relation of the photonic crystal structure and give the photon band image of the optical cavity, quickly evaluate the thickness and refractive index of the optical film, and study the light-matter coupling characteristics, especially the interaction between polaritons and photons (for two-dimensional materials, we can observe phenomena such as exciton-photon anticrossing and Rabi splitting, revealing physical mechanisms such as strong/weak coupling and spin selectivity)

2. Research on the properties and mechanisms of two-dimensional (antiferromagnetic) and ferroelectric materials

• Two-dimensional (antiferromagnetic) materials

Room temperature long-range magnetic order (perpendicular magnetic anisotropy); magnetic regulation (electric field/strain/light); magnetic coupling mechanism (intralayer/interlayer interaction); stability research (Curie temperature, environmental stability)

• Two-dimensional ferroelectric materials

Spontaneous polarization mechanism (interlayer sliding, interface charge regulation); ferroelectric domain characterization and manipulation; device applications (memory, optoelectronic devices)

3. Growth and preparation of low-dimensional materials

• Top-down: Chemical vapor transport/flux method + mechanical/chemical stripping

• Bottom-up: physical/chemical vapor deposition, micro-region confined flux method

4. Development of optoelectronic devices

• Electroluminescence ( LED ) from 2D materials

  Valley-polarized LED; 2D semiconductor Moiré superlattice LED; 2D magnetic material LED

• Strong coupling of exciton microcavities in two-dimensional materials

• Two-dimensional material laser (Laser)