教學情況
從教以來先後講授《熱學》、《大學物理》、《科技英語》、《熱力學·統計物理》和《量子統計物理學》等本科生、研究生課程。指導本科生課程設計、畢業論文與設計12名。
研究方向
（1）半導體和鐵電體納米結構的電子學和光電子學研究；
（2）分子器件中的電子輸運機理。
學術情況
自2003年以來, 先後主持中國博士後科學基金1項, 主持湖南省教育廳青年科學基金1項。在國際及國內專業學術刊物上，如Phys.Rev.B，The European Physical Journal B, Journal of Applied Physics等國內外核心刊物上發表研究SCI檢索論文8篇。
近年發表的有代表性的論文：
1. Xin-Hai Liu, Xue-Hua Wang, and Ben-Yuan Gu, “Effects of interwell coupling on plasmon modes in symmetric double square quantum well structures”, Phys. Rev. B 64, 195322 (2001).
2. Xin-Hai Liu, Xue-Hua Wang, and Ben-Yuan Gu, “Effects of tunneling coupling on plasmon modes in asymmetric double-quantum- well structures”, Eur. Phys. J. B 24, 37 (2001).
3. Xin-Hai Liu, Xue-Hua Wang, and Ben-Yuan Gu, “Effects of extension and overlap of wave functions on plasmon modes in symmetric double-quantum-well structures”, Commun. Theor. Phys. 36, 227 (2001).
4. Xin-Hai Liu, Xue-Hua Wang, and Ben-Yuan Gu, “Plasmons in asymmetric double quantum well structures”, Eur. Phys. J. B 30, 339 (2002)
5.Xin-Hai Liu, Jian Wu, Wenhui Duan, and Bing-Lin Gu, Generation of narrow-band terahertz radiation with preset frequency components in poled ferroelectric materials, J. Appl. Phys. 97，114108 (2005).
6. Xi-Li Zhang, Xue-Hua Wang, Xin-Hai Liu, and Ben-Yuan Gu, “Effects of dielectric mismatch on the plasmons in quantum well systems”, Int. J. Mod. Phys. B 17, 6073 (2003).
7. Kai-HeDing，Zhen-Gang Zhu，and Xing-Hai Liu, “Spin-dependent transport through a finite interacting quantum dot with intradot spin-flip scattering”, Modern Physics Letters B 22, 323 (2008).
8. LI Jiang-Fan, FANG Jia-Yuan, XIAO Fu-Liang, LIU Xin-Hai, and WANG Cheng-Zhi, “Time Evolution and Squeezing of Degenerate and Non-degenerate Coupled Parametric Down-Conversion with Driving Term”, Commun. Theor. Phys. 51, 514 (2009).
