“Transport properties of high-quality ultrathin two-dimensional superconducting Mo2C crystals and Heterostructures”

发布者:康宁发布时间:2019-10-10浏览量:

澳门新葡亰手机版天马材料研究论坛168

 

题  目:Transport properties of high-quality ultrathin two-dimensional superconducting Mo2C crystals and Heterostructures”

报告人:康宁 副教授

地  点:工程实验大楼244240多媒体报告厅

时  间:20191011日(周五)上午9:30-11:00

主持人:李梓维 副教授

邀请人:材料科学与程学院

承办人:材料学院天马材料研究论坛日常工作小组

 

报告人简介:

康宁,北京大学信息科学技术学院物理电子研究所副教授。毕业于南京大学物理系,中国科学院物理研究所获得理学博士学位,先后在德国Konstanz大学物理系、日本东京大学和巴黎十一大学做博士后研究员。现北京大学电子系任职副教授。研究领域集中在极低温、强磁场和高压的极端物理条件下低维电子体系及其量子器件的表征和输运性质研究。

报告摘要:

Despite a number of investigations in various superconducting films, so far the transport studies have been mostly limited to the case of disordered two-dimensional (2D) superconducting systems, either amorphous or granular. There is particularly interesting in the studies on a cleaner superconducting crystal samples for the understanding the intrinsic nature of superconducting fluctuations in the 2D limit.

Recently, we have obtained high-quality 2D ultrathin Mo2C superconducting crystals and graphene/Mo2C heterostructures by means of chemical vapor deposition method. Here, we report on low-temperature transport measurements on high-quality ultrathin superconducting Mo2C crystals and heterostructures in the 2D limit. We discuss that these anomalous transport behaviors can be understood quantitatively by including the effects of inhomogeneous superconducting phase and quantum fluctuations of the phase order parameter in the vicinity of the superconductor-insulator transition regime. For graphene/ Mo2C heterostructures, the strong interface coupling leads to a phase diagram of superconducting transition with multiple voltage steps being observed. Furthermore, we demonstrate the realization of highly transparent Josephson junction devices based on these strongly coupled heterostructures.

Our results demonstrate that such stable high-quality clean 2D superconducting crystals and heterostructures provide a new material platform to investigate novel phenomena in 2D superconductor.

 

 

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