超导国家重点实验室学术讲座

报告题目：Tailoring the Electronic Structure of Quantum Materials under Extreme Conditions

报告人：Oleksandr Zheliuk，Special Postdoctoral Researcher，RIKEN Center for the Emergent Matter Science (CEMS)

报告时间：2026年7月15日 （星期三）10:00

报告地点：M253会议室

联系人： 陈其宏 研究员

报告摘要：

The ability to manipulate the electronic structure of quantum materials is pivotal to discovering emergent quantum phases and developing future quantum technologies. External tuning parameters-including dimensional confinement, electrostatic doping, and high magnetic fields-provide powerful and complementary means to engineer electronic states and uncovering their underlying properties. In this talk, I will present several examples illustrating how these approaches can be combined to control and probe the electronic structure of low-dimensional materials. I will first demonstrate how dimensional confinement and electrostatic doping lead to the realization of the quantum Hall state in semiconducting Bi2O2Se [1]. In contrast, dimensional reduction applied to rare-earth tritellurides (RTe3) preserves the characteristic linearly dispersing electronic states down to the few-layer limit, demonstrating remarkable robustness of their electronic structure [2]. Finally, I will discuss multivalley electronic structure of ion-gated transition-metal dichalcogenides resolved through Shubnikov-de Haas oscillations, providing new insights into the microscopic origin of superconductivity. Together, these examples demonstrate how external perturbations can be used to tailor the electronic structure of quantum materials and uncover fundamental quantum phenomena that remain hidden under normal conditions.

[1] O. Zheliuk, Y. Kreminska, Q. Fu, D. Pizziranni, E.L.Q.N. Ammerlaan, Y. Wang, S. Hameed, P. Wan, X. Peng, S. Wiedmann, Z. Liu, J.T. Ye & U. Zeitler, “Quantum Hall effect in CVD-grown oxide”, Nature Communications 15, 10052 (2024)

[2] O. Zheliuk, Y. Kreminska, D. Pizzirani, C.S.A. Müller, P. v.d. Berg, S. Hameed, P. Wan, X. Peng, S. Lei, S. Grytsiuk, L. Schoop, M. Rösner, U. Zeitler, S. Wiedmann, & J.T. Ye, “Linearly dispersing carriers in atomically thin NdTe3”, DOI:10.21203/rs.3.rs-8040002/v1

报告人简介：

Oleksandr Zheliuk is a Special Postdoctoral Researcher at the RIKEN Center for the Emergent Matter Science (CEMS), Japan. He received his Ph.D. in condensed matter physics from the University of Groningen and later continued his research at the High Field Magnet Laboratory in Nijmegen, before joining RIKEN. His research explores quantum transport phenomena in low-dimensional quantum materials, including superconductors and high-mobility layered van der Waals systems under high magnetic fields, low temperatures and electrostatic doping. His work seeks to reveal new electronic states of matter and advance the development of next-generation quantum and nanoelectronics technologies.