Since the first observation of high mobility electron gas at LaAlO3 (LAO) and SrTiO3 (STO) interface in 2004, the research on complex oxide heterostructures have been fertile for its potential electronic applications. It has also been diverging to other physical phenomena to electric field tunable superconductivity, metal-insulator transition, and coexistence of superconductivity and ferromagnetism. In this talk, I will introduce what we have recently observed in a LAO/STO heterostructure via persistent photoconductivity effect following a brief overview of this research area. We are able to stablise the high mobility two dimensional HOLE gas at the surface in coexistence with an electron gas at the interface. A series of Shubnikov-de Haas oscillations in various gate voltages allows to see the hole gas with a density of 3x10^11 cm^-2 and a mobility of 10,000 cm^2/Vs.
Date:
Thursday, 22 November, 2012 - 14:30 to 16:30
Contact name:
Kimberly Cole
Contact email:
Contact phone:
01223764822
Event location:
Mott Seminar