2015年1月5日（周一）上午9:30，量子物质科学协同创新中心 & 物理系seminar：

报告题目： 2-dimensional Superconductivity at the LaAlO3/SrTiO3 Interface 报告人：李丹枫 DQMP, University of Geneva 报告时间： 2015.1.5 9:30 am 报告地点：清华理科楼三楼报告厅摘要： The interface between LaAlO3 and SrTiO3, two good band insulators, which was found in 2004 to be conducting [1], and, in some doping range, superconducting with a maximum critical temperature of about 200 mK [2] is attracting of lot of attention. The electron gas has a thickness of a few nanometers at low temperatures and a low electronic density, typically 5 1013 electrons/cm2. Being naturally sandwiched between two insulators, it is ideal for performing electric field effect experiments that allow the carrier density to be tuned.
I will discuss in this presentation superconductivity, the phase diagram of the system and the link with doped bulk SrTiO3 [2,3]; spin orbit and recent experiments on nanostructures that reveal a remarkable tuning of the electronic properties and allow weak localization and weak anti-localization as a function of doping and temperature to be followed [4,5]. Finally, I will discuss an approach [6] that should allow superconducting coupling between different gases in the functional bi-interface LaAlO3/SrTiO3 heterostructures to be studied.
[1] A. Ohtomo, H. Y. Hwang, Nature 427, 423 (2004).
[2] N. Reyren, S. Thiel, A. D. Caviglia, L. Fitting Kourkoutis, G. Hammerl, C. Richter, C. W. Schneider, T. Kopp, A.-S. Ruetschi, D. Jaccard, M. Gabay, D. A. Muller, J.-M. Triscone and J. Mannhart, Science 317, 1196 (2007).
[3] A. D. Caviglia, S. Gariglio, N. Reyren, D. Jaccard, T. Schneider, M. Gabay, S. Thiel, G. Hammerl, J. Mannhart, and J.-M. Triscone, Nature 456, 624 (2008).
[4] A. D. Caviglia, M. Gabay, S. Gariglio, N. Reyren, C. Cancellieri, and J.-M. Triscone, Physical Review Letters 104, 126803 (2010).
[5] A. Fête, S. Gariglio, A. D. Caviglia, M. Gabay, and J.-M. Triscone, Physical Review B (RC) 86, 201105 (2012).
[6] D. Li, S. Gariglio, C. Cancellieri, A. Fête, D. Stornaiuolo, and J.-M. Triscone, APL Materials 2, 012102 (2014). 报告人简介：李丹枫，男，1986年8月生。目前于日内瓦大学攻读博士学位（四年级），导师为钙钛矿氧化物界面与异质结领域著名学者Jean-Marc Triscone教授。2008年毕业于浙江大学材料科学与工程系，之后就读于香港理工大学应用物理系，并于2011年获得理学硕士学位。期间，于2010年2月至8月，在日内瓦大学做短期访问，并完成硕士论文。硕士以来的研究方向和研究兴趣主要为：钙钛矿过渡金属元素氧化物异质结的外延生长和超晶格结构的制备、氧化物界面输运性质与场效应调制、低维系统超导态等。博士的研究课题为“钙钛矿型过渡金属氧化物界面二维电子态的电子输运及超导特性”。过去的三年中，作为第一作者或共同作者，共发表或投稿论文7篇，共参加国际性学术会议19次，并在重要国际会议上做报告9次，其中包括在美国材料研究学会春季年会上做邀请报告一次。