报告题目Title：Terahertz charge dynamics in the proximity of quantum critical point in the phase diagram of rare earth nickelates
报 告 人Speaker：V. Eswara Phanindra（Indian Institute of Science Education and Research (IISER) Bhopal, India）
报告时间Time：2018年1月11日（周四）15:30
报告地点Venue：校本部E106 会议室
摘要：The intertwined and competing energy scales of various interactions like charge, spin, orbital and lattice correlations in rare-earth nickelates RNiO3 (R = La to Lu) hold potential for wide range of exotic ground states, realized via unified approach of transport measurements and unconventional techniques like terahertz (THz) spectroscopy. In this regard, I studied about novel electronic phase crossovers in structurally modified PrNiO3 (PNO) and LaNiO3 (LNO) thin films, which lies in the proximity of quantum critical point (QCP) in nickelates phase diagram1. In the first part of my talk, I will give an overview of unusual low-energy dynamic phases in structurally modified PNO thin films explored via THz spectroscopy2. Furthermore such THz spectral features are in turn accompanied by novel electronic phase crossovers like non-Fermi liquid (implying the proximity to a QCP) to Fermi liquid behavior as one traverses from compressive to tensile PNO films3. In the second part of my talk, I choose structurally distorted LNO as a model system and thereby observed a pronounced disparity in the static and dynamic transport behaviors along orthogonal axes. This unique crystal axis induced transport anisotropy, emphasizes the need to engineer the charge transport along appropriate crystal axis to ascertain the application potential of nickelates4.
