Spin-polarized two-dimensional electron gas in undoped MgxZn1-xO/ZnO heterostructures

被引：14
|
作者：
Han, K. [1 ]
Tang, N. [1 ]
Ye, J. D. [2 ,3 ]
Duan, J. X. [1 ]
Liu, Y. C. [1 ]
Teo, K. L. [4 ]
Shen, B. [1 ]
机构：
[1] Peking Univ, State Key Lab Artificial Microstruct & Mesoscop P, Sch Phys, Beijing 100871, Peoples R China
[2] Nanjing Univ, Sch Elect Sci & Engn, Nanjing 210093, Jiangsu, Peoples R China
[3] Australia Natl Univ, Dept Elect Mat Engn, Res Sch Phys & Engn, Canberra, ACT 0200, Australia
[4] Natl Univ Singapore, Dept Elect & Comp Engn, Singapore 117576, Singapore
来源：
APPLIED PHYSICS LETTERS | 2012年 / 100卷 / 19期
基金：
中国国家自然科学基金;
关键词：
ZNO;
D O I：
10.1063/1.4711775
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Quantum transport properties of two-dimensional electron gas (2DEG) in undoped MgxZn1-x O/ZnO heterostructures grown by metal organic vapor phase epitaxy have been investigated. A large zero-field spin-splitting energy more than 15 meV in the 2DEG is determined at 1.6 K. Meanwhile, ferromagnetism is observed in the heterostructures. The findings reveal that the 2DEG is spin polarized at zero magnetic fields. It is believed that the exchange interaction between the itinerant electrons in the two-dimensional channel and the magnetic polarons in the MgxZn1-xO barrier around the interface results in the spin polarization of the 2DEG. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4711775]
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页数：4
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