Two-dimensional metallic behavior at polar MgO/BaTiO3 (110) interfaces

doi:10.1088/1674-1056/24/3/037301

Abstract The first-principles calculations are employed to investigate the electrical properties of polar MgO/BaTiO₃ (110) interfaces. Both n-type and p-type polar interfaces show a two-dimensional metallic behavior. For the n-type polar interface, the interface Ti 3d electrons are the origin of the metallic and magnetic properties. Varying the thickness of BaTiO₃ may induce an insulator-metal transition, and the critical thickness is 4 unit cells. For the p-type polar interface, holes preferentially occupy the interface O 2p_y state, resulting in a conducting interface. The unbalance of the spin splitting of the O 2p states in the interface MgO layer leads to a magnetic moment of about 0.25μ_B per O atom at the interface. These results further demonstrate that other polar interfaces, besides LaAlO₃/SrTiO₃, can show a two-dimensional metallic behavior. It is helpful to fully understand the role of polar discontinuity on the properties of the interface, which widens the field of polar-nonpolar interfaces.

Keywords: electronic structures MgO/BaTiO₃ (110) polar interfaces two-dimensional electron gas (2DEG) magnetism

Received: 22 August 2014
Revised: 05 October 2014
Accepted manuscript online:

PACS:	73.20.At	(Surface states, band structure, electron density of states)
	75.70.Cn	(Magnetic properties of interfaces (multilayers, superlattices, heterostructures))
	73.20.-r	(Electron states at surfaces and interfaces)
	75.70.-i	(Magnetic properties of thin films, surfaces, and interfaces)

Fund: Project supported by the National Basic Research Program of China (Grant No. 2013CB632506), the National Natural Science Foundation of China (Grant Nos. 11374186, 51231007, 51202132, and 51102153), and the Independent Innovation Foundation of Shandong University, China (Grant No. 2012TS027).

Corresponding Authors: Li Ji-Chao
E-mail: lijichao@sdu.edu.cn

Cite this article:

Du Yan-Ling (杜颜伶), Wang Chun-Lei (王春雷), Li Ji-Chao (李吉超), Zhang Xin-Hua (张新华), Wang Fu-Ning (王芙凝), Liu Jian (刘剑), Zhu Yuan-Hu (祝元虎), Yin Na (尹娜), Mei Liang-Mo (梅良模) Two-dimensional metallic behavior at polar MgO/BaTiO₃ (110) interfaces 2015 Chin. Phys. B 24 037301

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Two-dimensional metallic behavior at polar MgO/BaTiO3 (110) interfaces

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Two-dimensional metallic behavior at polar MgO/BaTiO₃ (110) interfaces