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)

Physical Review Letters 132, 264101 (2024)

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

Thermal measurement facilities

2x TDTR setup

TDTR1: with Coherent Chameleon Ultra II laser.

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

1x FDTR setup

4x Cryostat: Janis ST-500 (80-500 K); Janis VPF 800 (80-800 K); Physik Vcryo V-200 (80-500 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 Microchannel test setup

Thin film deposition

1x Sputter, sample stage up to 800°C

1x MBE, sample stage up to 1200°C

Spectroscopies

Home build Raman and time-resolved Raman

1x Fluorescence Spectroscopy with Ocean Optics HR 4000 Spectrometer