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Topological insulators and their properties are among the most highly studied domains in condensed matter physics. In this talk, I will first present my study of the chemical-vapor deposition growth of Bi2Se3 nanocrystals on a Si substrate, with a gold catalyst. Through study of the temperature dependence of the growth, we find that the size of the Bi2Se3 nanocrystals changes as the growth temperature rises from 500°C to 600°C, and crystallization quality of the nanocrystals reaches its optimum at 560°C, at which nanocrystals of desired physical dimensions for nanoscale fabrications can be obtained.
Next, I will present our measurement of magneto-resistance and Shubnikov de Haas oscillations on the longitudinal resistance of the single crystal of Ta3SiTe6, a topological semimetal candidate. Topological semimetals characterize a novel class of quantum materials hosting Dirac/Weyl fermions, and the important characteristics of these topological fermions can be exhibited by quantum oscillations. Performing SdH oscillation measurements with an applied magnetic field up to 38 T, our data shows that the Fermi pocket of Ta3SiTe6 has a cross-section area of 0.13 Å-2. Combining magneto-transport measurements and the first-principle calculations, we observe that these oscillations come from the hole pocket. Hall resistivity and the SdH oscillations indicate that Ta3SiTe6 is a hole dominated system.
Dr. Muhammad Naveed completed his master degree study in Nanjing University (NJU) in 2017, then received his PhD degree in Physics also in NJU in 2021. His PhD supervisor is Prof. Fengqi Song. Dr. Naveed’s research interests include: topological insulators and topological semimetals, nano-material synthesis, chemical vapor deposition, thin film growth and fabrication etc. Till now Dr. Naveed has published 12 research papers.
Tencent Meeting link: https://meeting.tencent.com/dm/tkXsUF80duGO
Meeting ID: 759 641 679 Password: 123456