研究目的
Investigating the spin-dependent tunneling of light holes (LH) and heavy holes (HH) in a symmetrical heterostructure with externally applied electric and magnetic fields.
研究成果
A perfect spin filter is proposed using CdTe/Cd1–xMnxTe double barrier heterostructure. The spin-dependent properties are evaluated using the matrix method. The polarization efficiency of LH approaches zero as Ez increases, whereas it is almost ?1 for HH except at resonances. The current densities of spin-up and spin-down LHs are reported; however, the current density of spin-down HH is finite and spin-up HH is almost zero.
研究不足
The study is limited to the specific conditions of the CdTe/Cd1–xMnxTe double barrier heterostructure and the effects of externally applied electric and magnetic fields. The polarization efficiency and current density are analyzed under these specific conditions, which may not be generalizable to other materials or configurations.
1：Experimental Design and Method Selection:
The study uses the matrix method to evaluate spin-dependent properties in a CdTe/Cd1–xMnxTe double barrier heterostructure. The Hamiltonian of hole motion along the z-axis in the framework of the effective mass approximation is considered.
2：Sample Selection and Data Sources:
The heterostructure potential V0 (B, z) depends on the externally applied magnetic field and decreases as the field increases. The Zeeman splitting and giant Zeeman splitting are accounted for.
3：List of Experimental Equipment and Materials:
The study involves the use of a CdTe/Cd1–xMnxTe double barrier heterostructure with applied electric and magnetic fields.
4：Experimental Procedures and Operational Workflow:
The polarization efficiency of LH and HH as a function of applied magnetic field and bias voltage is analyzed. The current density of LH and HH is calculated considering spin-down and spin-up components.
5：Data Analysis Methods:
The transfer matrix is formed from the interface matrices to calculate the transmission coefficients and the polarization efficiency.
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