Probing the Electronic Structure of (110)- and (111)-KTaO₃Two Dimensional Electron Gases by ARPES

Two dimensional electron gases (2DEGs) in oxides show great potential for the discovery of new physical phenomena and, at the same time, hold promise for electronic applications. The strong spin-orbit coupling material KTaO₃ (KTO) can host a 2DEG in the three main crystallographic directions that recently brought surprises in both areas. On the hand superconductivity with critical temperatures of T_c ~ 2.2 K and T_c ~ 0.9 K for 2DEGs confined at the (111) and (110) interfaces was observed. Additionally Spin–Charge interconversion was demonstrated in KTO based 2DEGs. In this talk we will present angle resolved photoemission spectroscopy (ARPES) measurements of the electronic structure of the 2DEGs stabilized in (110) and (111)-KTO surfaces and/or interfaces.[1] Our measurements are well reproduced by self-consistent tight-binding supercell calculations performed with BinPo. [2] We will finally discuss the spin and orbital texture of both systems and its implications for superconductivity and devices.