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报告题目:Oxygen Vacancy-Driven Orbital One- and Two-channel Kondo Effect in RuO2 and IrO2 Nanowires
报告时间:2024-11-25 14:00 (星期一)
报告地点:北洋园校区49教学楼410会议室
报告人:林志忠 教授 (台湾阳明交通大学)
报告摘要:
Strong electron correlations have longbeen recognized as driving the emergence of novel phases of matter. A well-recognizedexample is high-temperature superconductivity which cannot be understood in termsof the standard weak-coupling theory. The exotic properties accompanying theformation of the two-channel Kondo (2CK) effect including the emergence of anunconventional metallic state in the low-energy limit also originate fromstrong electron interactions. Despite its paradigmatic role in the formation ofnon-standard metal behavior, the stringent conditions required for itsemergence have made the observation of the nonmagnetic, orbital 2CK effect inreal quantum materials difficult, if not impossible. We report the observationof orbital one- and two-channel Kondo physics in the symmetry-enforced Diracnodal line (DNL) metals IrO2 and RuO2 nanowires and showthat the symmetries that enforce the existence of DNLs also promote theformation of nonmagnetic Kondo correlations. Rutile oxide nanostructures thusform a versatile quantum matter platform to engineer and explore intrinsic,interacting topological states of matter.
References
报告人简介:
林志忠教授于1979年在台湾交通大学电子物理系获得学士学位,1986年在美国普渡大学获得物理学博士学位,之后分别在密歇根大学和弗吉尼亚大学做博士后研究。他于1988年获聘为台湾大学物理系副教授,于1992年晋升为教授。自1997年以来,他一直在台湾(阳明)交通大学物理研究所和电子物理系任教。他的研究领域是低温凝聚态物理实验,聚焦于量子输运和电子退相干、近藤效应、低频噪声以及小型器件和异质结构中的非常规超导性质。