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Siow Mean Loh

Research

I am a first-year PhD student under the supervision of Dr. Nicholas Hine. I graduated from National Chung Cheng University in 2013 with a Bachelor’s Degree and in 2014 with a Master’s degree in Physics.

I have been interested in transition-metal dichalcogenide (TMDC) materials since I was a research assistant in Taiwan because they have some promising properties, such as direct band gap, which can be utilised in areas such as nanoelectronic and optoelectronic devices. The band gap of TMDC materials can be tuned by various methods, for example, applying external strain [1] and changing the compositions [2-3]. My work so far aims to investigate the electronic properties of Mo1-xWxS2 and W1-xNbxS2 monolayer. ONETEP, a linear-scaling density functional theory (LS-DFT) package is mainly used to do the material simulations. I have already done some works on the effects of alloying on their electronic properties, for example, band gap and the splitting of valence band maximum (VBM) when considering spin orbit coupling. Those properties are also compared with the experimental data from Dr. Neil Wilson’s group. There are still some other interesting properties and TMDC materials worth investigating and I will keep going to study this kind of materials.

References
[1] H. L. Shi, H. Pan, Y.-W. Zhang, and B. I. Yakobson, Phy. Rev. B 87, 155304 (2013)
[2] W. T. Zhang, X. D. Li, T. T. Jiang, J. L. Q. Song, Y. Lin, L. X. Zhu and X. L. Xu, Nanoscale 7, 13554 (2015).
[3] B. Huang, M. Yoon, B. G. Sumpter, S.-H. Wei and F. Liu, Phys. Rev. L 115, 126806 (2015).