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首页> 外文期刊>Zeitschrift fur Physik, B. Condensed Matter >Influence of magneto-coupling between the longitudinal motion component and transverse Landau orbits of an electron on transmission features in single quantum barriers
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Influence of magneto-coupling between the longitudinal motion component and transverse Landau orbits of an electron on transmission features in single quantum barriers

机译：电子的纵向运动分量和横向朗道轨道之间的磁耦合对单量子势垒中传输特性的影响

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In this paper we study the influence of the magneto-coupling effect between the longitudinal motion component and the transverse Landau orbits of an electron on transmission features in single barrier structures. Within the parabolic conduction-band approach, a modified one-dimensional effective-mass Schrodinger equation, including the magneto-coupling effect generated from the position-dependent effective mass of the electron, is strictly derived. Numerical calculations for single barrier structures show that the magneto-coupling effect rings about a series of the important changes for the transmission probability, the above-barrier quasi-bound states, and the tunneling time. Through examining the variation of the above-barrier resonant-transmission spectrum with the barrier width and observing the well-defined Lorentzian line-shape of the above-barrier resonant peaks, we convincingly show that the above-barrier resonant transmission in single barrier structures is delivered by the above-barrier quasibound states in the barrier region, just as the below-barrier resonant tunneling in double barrier structures is mediated by the below-barrier quasi-bound states in the well. Furthermore, we come to the conclusion that the magneto-coupling effect brings about not only the splitting of the above-barrier quasi-bound levels but also the striking reduction of the level-width of the quasi-bound states, correspondingly, the substantial increase of the density of the quasi-bound states. We suggest that magneto-coupling effects may be observed by the measurements of the optical absorption spectrum associated with the above-barrier quasi-bound states in the single barrier structures.
机译：在本文中，我们研究了电子的纵向运动分量和横向Landau轨道之间的磁耦合效应对单势垒结构中传输特性的影响。在抛物线导带方法中，严格推导了一个修正的一维有效质量Schrodinger方程，包括从电子的位置相关有效质量产生的磁耦合效应。单个势垒结构的数值计算表明，磁耦合效应围绕着一系列重要的变化而发生环化，这些变化涉及传输概率，高于势垒的准束缚态和隧穿时间。通过检查上述势垒共振传输谱随势垒宽度的变化并观察清晰定义的上述势垒共振峰的洛伦兹线形，我们令人信服地表明，单势垒结构中的上述势垒共振传输是正如在势垒区中的低于势垒准结合态所传递的一样，双势垒结构中的低于势垒的共振隧穿是由井中低于势垒的准结合态介导的。此外，我们得出的结论是，磁耦合效应不仅会导致上述势垒准能级的分裂，而且还会导致准能级的能级宽度显着减小，相应地，显着增加束缚态的密度我们建议通过与单个势垒结构中与上述势垒准结合态相关的光吸收谱的测量可以观察到磁耦合效应。

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