Observation of orbital selective charge transfer in a Fe/BaTi⁢O3 interfacial two-dimensional electron gas

Sohn, Byungmin; Marcaud, Guillaume; Shin, Yeongjae; Lee, Sangjae; Werner, Tyler; Yilmaz, Turgut; Yang, Jinming; Wei, Wenzheng; Fedorov, Alexei; Vescovo, Elio; He, Yu; Ismail-Beigi, Sohrab; Ahn, Charles H.; Walker, Frederick J.

doi:10.1103/physrevb.109.155106

Title: Observation of orbital selective charge transfer in a Fe/BaTi⁢O₃ interfacial two-dimensional electron gas

Journal Article · 01 April 2024 · Physical Review. B

DOI: https://doi.org/10.1103/physrevb.109.155106 · OSTI ID:2433983

Sohn, Byungmin ^[1];

^[2]; Shin, Yeongjae ^[2]; Lee, Sangjae ^[2]; Werner, Tyler ^[2]; Yilmaz, Turgut ^[3];

^[2];

^[4]; Vescovo, Elio ^[3];

^[2]; Ismail-Beigi, Sohrab ^[2]; Ahn, Charles H. ^[2]; Walker, Frederick J. ^[2]

Yale Univ., New Haven, CT (United States); Sungkyunkwan University (Korea, Republic of)
Yale Univ., New Haven, CT (United States)
Brookhaven National Laboratory (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Two-dimensional electron gas (2DEG) states at oxide interfaces between two ferroic materials have been fertile ground to realize controllable multiferroicity. Here, in this work, we investigate the 2DEG states at the interface of ferroelectric BaTi⁢O₃ and a magnetic layer of iron using angle-resolved photoemission spectroscopy. Orbital-selective charge transfer occurs on the surprisingly robust 2DEG. Based on first-principles calculations, we show how the interfacial hybridization can give rise to the unexpected charge transfer in the magnetic 2DEG. Our study reveals a close interplay on a 2DEG between magnetic and ferroelectric interfaces, which sheds light on future design principles of multiferroic 2DEG states.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)

Grant/Contract Number:: SC0012704; AC02-05CH11231

OSTI ID:: 2433983

Alternate ID(s):: OSTI ID: 2474409

Report Number(s):: BNL--225974-2024-JAAM; {"Journal ID: ISSN 2469-9950",""}

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 15 Vol. 109; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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electronic structure
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Title: Observation of orbital selective charge transfer in a Fe/BaTi⁢O3 interfacial two-dimensional electron gas

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Title: Observation of orbital selective charge transfer in a Fe/BaTi⁢O₃ interfacial two-dimensional electron gas