ABSTRACT
The emergence of new electronic and optical structures from the intricate coupling of charge, spin, orbital and lattice degrees of freedom have been a central research theme in modern Condensed Matter Physics. Besides, the understanding of coupling dynamics allows us to control and modulate novel physical phenomena in new materials. The optical spectroscopic techniques at different energy range are great methods to explore such coupling. In this seminar, I will summarize my previous research studies on correlated systems using multiple optical spectroscopy techniques.
Using the integrated optical spectroscopic approach, 1. investigate the electronic correlations in high-Tc superconducting cuprate films studied. In which, we unravel the coexistence of a distinct antiferromagnetic mid-gap and a Mott state in ambipolar cuprate films, which unifies a long-standing puzzle about the correlation strengths, and resolves the origin of asymmetry between electron and hole doping cuprates. 2. We will next discuss the phase transition dynamics and many-body interactions in 2D transition metal dichalcogenides (2D-TMDs). Specifically, a new method has been conceived to induce the 1H-1T’ phase transition and its underlying mechanism. From which, a tunable inverted gap and a fundamental gap can be observed in 1T’-phase 2D-TMDs. 3. The integrated experimental approach also leads to the detection of three electronic and magnetic phases in manganite films on various oxide substrates and analysis unravels the mechanism that controls the transport and magnetic properties in the manganite films. 4. I will end off the seminar with some information on the observation of new quantum quasi-particles in the quantum materials which I have presented.
BIOGRAPHY
Dr Yin Xinmao, is a Research Fellow at the Physics department, National University of Singapore and the Singapore Synchrotron Light Source. His research interests lie in the integration of optical spectroscopic and synchrotron-based methods to study the electronic and spin structures of novel condensed matter systems. With special emphasis on novel systems such as 2D transition metal dichalcogenides, High-Tc superconducting cuprates, and colossal magnetoresistance manganites, and their interfaces, he seeks to understand the physical mechanism underlying the superconductive, ferromagnetic, phase transition, and quasi-particle dynamics in these systems. His works have been published in multiple high-impact peer review journals including Physical Review Letters, Nature Communications, NPG Asia Materials, Advanced Science, ACS Nano, Advanced Materials, Advanced Functional Materials, ACS Applied Materials & Interfaces, and Physical Review B. He also serves as a referee to many peer-review journals, such as Nature Communications, Advanced Functional Materials and ACS Nano.
Dr Yin Xinmao received his PhD from National University of Singapore in 2015, and was a visiting research fellow at Shenzhen University from 2016—2017. Prior to that, Xinmao graduated from Zhejiang University in 2010 with a bachelor’s degree in Physics.
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https://cityu.zoom.us/meeting/register/tJMkdeGgrTkvGta36FZjJYh2o7Lao5vsPY3F
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