Reversible Formation of 2D Electron Gas at the LaFeO3/SrTiO3 Interface via Control of Oxygen Vacancies

• DOI: 10.1002/adma.201604447
• Publication Date: 2017-01-16T14:03:15Z
• Authors: Pengfa Xu; Wei Han; Philip M. Rice; Jaewoo Jeong; Mahesh G. Samant; Katayoon Mohseni; Holger L. Meyerheim; Sergey Ostanin; Igor V. Maznichenko; Ingrid Mertig; Eberhard K. U. Gross; Arthur Ernst; Stuart S. P. Parkin
• Keywords: 02 engineering and technology; 0210 nano-technology

A conducting 2D electron gas (2DEG) is formed at the interface between epitaxial LaFeO3 layers >3 unit cells thick and the surface of SrTiO3 single crystals. The 2DEG is exquisitely sensitive to cation intermixing and oxygen nonstoichiometry. It is shown that the latter thus allows the controllable formation of the 2DEG via ionic liquid gating, thereby forming a nonvolatile switch.