Tailoring LaAlO3/SrTiO3 Interface Metallicity by Oxygen Surface Adsorbates

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• 作者：Weitao Dai ; Sanjay Adhikari ; Andrés Camilo Garcia-Castro ; Aldo H. Romero ; Hyungwoo Lee ; Jung-Woo Lee ; Sangwoo Ryu ; Chang-Beom Eom ; Cheng Cen
• 刊名：Nano Letters
• 出版年：2016
• 出版时间：April 13, 2016
• 年：2016
• 卷：16
• 期：4
• 页码：2739-2743
• 全文大小：368K
• 年卷期：0
• ISSN：1530-6992

文摘

We report an oxygen surface adsorbates induced metal–insulator transition at the LaAlO₃/SrTiO₃ interfaces. The observed effects were attributed to the terminations of surface Al sites and the resultant electron-accepting surface states. By controlling the local oxygen adsorptions, we successfully demonstrated the nondestructive patterning of the interface two-dimensional electron gas (2DEG). The obtained 2DEG structures are stable in air and also robust against general solvent treatments. This study provides new insights into the metal–insulator transition mechanism at the complex oxide interfaces and also a highly efficient technique for tailoring the interface properties.