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Two-dimensional (2D) superconducting systems are of great importance for exploring exotic quantum physics. The recent development of fabrication techniques has stimulated studies of high-quality 2D crystalline superconductors, where intrinsic properties give rise to unprecedented physical phenomena. In this talk, I will introduce my recent works on Ising superconductivity, quantum Griffiths singularity and anomalous metallic state, which are three important topics in the field of 2D crystalline superconductors. We detected the Interface induced Ising superconductivity [1] and type-II Ising superconductivity [2] in ultrathin crystalline Pb films and PdTe2 films, which can generalize the concept of Ising superconductivity to hundreds of 2D materials. Furthermore, we found a new kind of superconductor-metal transition in ultrathin Pb films, named as anomalous quantum Griffiths singularity, revealing the profound influence of spin-orbit coupling and superconducting fluctuation on the quantum phase transitions [3]. More importantly, we provide solid evidence of anomalous metallic states in the nanopatterned high-temperature superconducting films, which has been under intensive debate for over thirty years around the world [4].
[1] Physical Review X 8, 021002 (2018)
[2] Nano Letters 20, 5728-5734 (2020)
[3] Nature Communications 10, 3633 (2019)
[4] Science 366, 1505–1509 (2019)
Dr. Yi Liu received his bachelor’s degree in Physics from Peking University in 2013, and PhD degree in condensed matter physics from Peking University in 2019. Now he works as a Boya Postdoc in Prof. Jian Wang’s group at Peking University. His current research interests focus on the novel quantum phenomena in the superconducting systems, including anomalous metal, strange metal, quantum phase transitions, Ising superconductivity and unconventional superconductivity.
Venue: TDLI Meeting Room 200
Here is the Zoom link if you prefer to join us remotely:
https://zoom.com.cn/j/95511008045
Password:936828