Spin-polarized two-dimensional electron gas in undoped MgxZn1−xO/ZnO heterostructures
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Han, K.
Tang, N.
Ye, J. D.
Duan, J. X.
Liu, Y. C.
Teo, K. L.
Shen, B.
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American Institute of Physics (AIP)
Abstract
Quantum transport properties of two-dimensional electron gas(2DEG) in undoped MgₓZn₁ˍₓO/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 MgₓZn₁ˍₓO barrier around the interface results in the spin polarization of the 2DEG.
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Applied Physics Letters
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