Quantum Thermal Transport

We study the nuclear quantum effects on thermal transport. We found that the atomic quantum tunneling in ice and perovskite leads to strong interactions with heat-carrrying phonons. As a result, materials with two-level system or multi-level system will have anomalous thermal conductivity due to the coherent tunneling (in perovskite) or concerted incoherent tunneling (in ice).

Reference:

Nature Communications 11, 6039 (2020)

arXiv:2305.15713

Electron-phonon Coupling

We study how electron-phonon coupling affect thermal properties in metals, semi-metals, and semiconductors.

Thermal Transport in Semiconductors and across their Interfaces

Our main focus is on thermal transport in III-V semiconductors and across metal/semiconductor and semiconductor/semiconductor interfaces.

Reference:

Nature Materials 18, 136 (2019)

Nature Communications 13, 4901 (2022)

Thermally Functional Materials

We try to synthesis and develop general routes to the world's most thermally conductive polymers. We also study the mechanism lead to ultralow thermal conductivity. 2D materials are also our research interest.

Microchannel for Cooling

We fabricate microchannel devices for ultraefficient cooling.

Facilities

2x TDTR setup

TDTR1: with Coherent Chameleon Ultra II laser.

TDTR2: with Spectra-Physics Mai Tai HP. Integrated with Ruby Fluorescence Spectroscopy.

3x Cryostat: Janis ST-500 (80-500 K); Janis VPF 800 (80-800 K); Physik S500-P (80-500 K, 0-50 GPa).

1x High temperature chamber: up to 1500 K

Diamond Anvil Cells (0-50 GPa)

1x Sputter, sample stage up to 800°C

1x FDTR setup

1x Microchannel test setup