Speaker
Description
The two-dimensional electron gas (2DEG), formed at the surface/interface of oxide insulators, exhibits exotic physical properties. The modulation of electronic structures of 2DEG system are of crucial importance to control the properties. In this report, I will introduce the ARPES results on two 2DEG systems. (1) In amorphous LaAlO3/LaMnO3/SrTiO3, the LaMnO3 buffer layer significantly suppresses the formation of oxygen vacancies, and the electron-phonon interaction is reduced, explaining the mobility boost in this system. (Published on ACS Nano) (2) On SrTiO3 surface, we discovered band modulations with in-situ sputtering-annealing, and a robust single-band 2DEG states. Meanwhile, the possible origination and mechanisms of light-induced 2DEG on SrTiO3 surface are also discussed.
