My Research
Frequency-domain thermoreflectance
@NanoEngineering Group
We use modulated CW pump beam to heat up sample and use green CW probe to sense the surface temperature response at different frequencies.
Transient thermal grating
@NanoEngineering Group
We use interfering pulsed pump beams to heat up sample and use diffracted probe to sense the surface temperature changes of materials. Capable of changing the period length of the grating, we measure the heat diffusivity and buried interface conductance with high fidelity.
Nonequilibrium Green's function
@NanoEngineering Group
We use nonequilibrium Green's function to identify the specular transmission and diffuse transmission channels for electron/phonon transport across interfaces.
The adjustable thermal resistor by reversibly folding a graphene sheet
@Nano Heat Group (Advisor: Prof. Nuo Yang)
Phononic (thermal) devices are studied such as thermal diode, thermal transistors, thermal logic gates, and thermal memories. However, the thermal resistor has not been demonstrated yet. Here, we propose an instantaneously adjustable thermal resistor by folded graphene. Through theoretical analysis and molecular dynamics simulations, we studied the phonon folding effect and the dependent of thermal resistivity on the length between two folds and the overall length. Further, we discuss on the possibility to realize the instantaneously adjustable thermal resistor in experiment. Our studies bring insights in designing thermal resistor and understanding thermal modulation of 2D materials by adjusting its basic structure parameters.