Byungmin Sohn1,Guillaume Marcaud1,Yeongjae Shin1,Sangjae Lee1,Tyler Werner1,Turgut Yilmaz2,Jinming Yang1,Wenzheng Wei1,Alexei Fedorov3,Elio Vescovo2,Yu He1,Sohrab Ismail-Beigi1,Charles Ahn1,Frederick Walker1
Yale University1,Brookhaven National Laboratory2,Lawrence Berkeley National Laboratory3
Byungmin Sohn1,Guillaume Marcaud1,Yeongjae Shin1,Sangjae Lee1,Tyler Werner1,Turgut Yilmaz2,Jinming Yang1,Wenzheng Wei1,Alexei Fedorov3,Elio Vescovo2,Yu He1,Sohrab Ismail-Beigi1,Charles Ahn1,Frederick Walker1
Yale University1,Brookhaven National Laboratory2,Lawrence Berkeley National Laboratory3
Two-dimensional electron gas (2DEG) states at oxide interfaces have been of interest for a few decades. Here, we investigate with angle-resolved photoemission spectroscopy (ARPES) a potential ferromagnetic 2DEG state on a ferroelectric, BaTiO<sub>3</sub>, induced by a layer of iron atoms. As the iron layer is introduced, orbital-selective charge transfer, coupled with magnetic signatures, appears in 2DEG states, which is well resolved by ARPES measurements. First-principles calculations show that ferromagnetic atoms such as iron can introduce magnetism in 2DEG states by interfacial coupling effects. These observations lead to an understanding of how interfacial ferromagnetism in 2DEG states can be induced, shedding light on potential platforms that use ferromagnetic 2DEG states as a spin-dependent electric channel.