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Pressure is an effective tool to tune the properties of quantum materials and new states can emerge under pressure. Therefore, it is necessary to conduct reliable experiments under pressure to investigate pressure-induced states. In this seminar, I will describe our magnetoresistance studies of MoTe2 and CrAs, both featuring interesting temperature-pressure phase diagrams. In MoTe2, we track the Shubnikov-de Haas quantum oscillations in magnetoresistance as a function of pressure, enabling us to identify a hole Fermi pocket which is expected to present but has never been detected in quantum oscillations before. In CrAs, I will present our discovery of a linear magnetoresistance under pressure, which we attribute to quantum magnetoresistance from a tiny Fermi pocket hosting semi-Dirac electrons. Some future directions will be discussed in the seminar.
References:
[1] Y. J. Hu, W. C. Yu, Kwing To Lai, D. Sun, F. F. Balakirev, W. Zhang, J. Y. Xie, K. Y. Yip, E. I. Paredes Aulestia, Rajveer Jha, Ryuji Higashinaka, Tatsuma D. Matsuda, Y. Yanase, Yuji Aoki, and Swee K. Goh, Phys. Rev. Lett. 124, 076402 (2020)
[2] Y. J. Hu, Yuk Tai Chan, Kwing To Lai, Kin On Ho, Xiaoyu Guo, Hai-Peng Sun, K. Y. Yip, Dickon H. L. Ng, Hai Zhou Lu, and Swee K. Goh, Phys. Rev. Materials 3, 034201 (2019)
[3] Q. Niu, W. C. Yu, E. I. Paredes Aulestia, Y. J. Hu, Kwing To Lai, H. Kotegawa, E. Matsuoka, H. Sugawara, H. Tou, D. Sun, F. F. Balakirev, Y. Yanase, and Swee K. Goh, Phys. Rev. B 99, 125126 (2019)
[4] Q. Niu, W. C. Yu, K. Y. Yip, Z. L. Lim, H. Kotegawa, E. Matsuoka, H. Sugawara, H. Tou, Y. Yanase, Swee K. Goh, Nat. Commun. 8, 15358 (2017)
Professor Swee K. Goh received his PhD degree in University of Cambridge in 2009. After PhD, Swee worked as a Trinity College Research Fellow in Cavendish Laboratory in Cambridge for 4 years until 2013. Swee also spent one year in between working as a Visiting Researcher in Kyoto University. After his postdoc career, Swee joined the Department of Physics of the Chinese University of Hong Kong. There, he leads a research group to study magnetoresistance and quantum oscillations of quantum materials under pressure.