Spin-dependent resonant tunneling in CdTe/Cd1−xMnxTe nanostructures: effect of polaronic mass

IF 1.6 4区物理与天体物理 Q3 PHYSICS, CONDENSED MATTER

The European Physical Journal B Pub Date : 2025-03-06 DOI:10.1140/epjb/s10051-025-00888-4

L. Bruno Chandrasekar, A. Dinesh, Lalitha Gnanasekaran, Madhappan Santhamoorthy, M. Karunakaran, A. Manikandan, E. Priyadharshini, P. Shunmuga Sundaram, S. Kaleel Mohamed Ibrahim

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Abstract

Effect of polaronic mass on the resonant tunneling of electrons in CdTe/Cd_1−xMn_xTe double-barrier heterostructure is investigated. The well-known transfer matrix method is employed to calculate the barrier transparency. One can obtain a high degree of spin-polarization at a high concentration of Mn in the barrier region. The barrier transparency peak becomes narrow as the concentration of Mn increases from 10 to 20%. The effect of polaronic mass shifts the transparency peak to the lower value on the energy scale. One can obtain a high degree of spin-polarization at a high concentration of Mn in the barrier region. The account of the polaronic mass shifts the resonance energy of spin-polarization to the lower value and it enhances the spin-polarization. The spin-down electrons spend more time in the heterostructure than the spin-up electrons. The dwell time changes about 1000 times as the concentration of the barrier changes.

Graphical abstract

Spin separation versus Mn concentration (a) without the account of polaronic mass and (b) with the account of polaronic mass

Abstract Image

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CdTe/Cd1−xMnxTe纳米结构中的自旋相关共振隧道效应：极化质量的影响

研究了极化质量对CdTe/Cd1−xMnxTe双势垒异质结构中电子共振隧穿的影响。利用众所周知的传递矩阵法计算势垒透明度。在势垒区高浓度Mn时，可以获得高度的自旋极化。当Mn浓度从10%增加到20%时，势垒透明峰变窄。极化质量的影响使透明峰在能量尺度上向较低的值移动。在势垒区高浓度Mn时，可以获得高度的自旋极化。极化质量的计算使自旋极化的共振能量向较低值偏移，增强了自旋极化。自旋向下的电子比自旋向上的电子在异质结构中停留的时间更长。停留时间随着势垒浓度的变化而变化约1000倍。图示：自旋分离与Mn浓度的关系(a)不考虑极化生质量时，(b)考虑极化生质量时

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