Direct observation of surface bandgap shrinkage and negative electronic compressibility in SrTiO3

Warakorn Jindata, Trung-Phuc Vo, Chutchawan Jaisuk +4

In this work, we investigate and compare the electronic structures of SrTiO3 and KTaO3 under ultraviolet (UV) light induced electron doping. Using angle-resolved photoemission spec…