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年1月5日9:30

报告地点：理科楼B315

报告摘要：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.