标题： 长程相位相干在具有大厚度金属量子阱的双势垒磁性隧道结中 显示英文标题

标题： Long range phase coherencein double barrier magnetic tunnel junctions with large thick metallic quantum well

摘要： 双势垒异质结构是研究电子隧穿和量子阱（QW）中离散能级的模型系统。 到目前为止，在金属QW中观察到的共振隧穿现象仅限于有限的厚度（1-2纳米），在此厚度下电子相位相干性得以保持。 在本研究中，我们展示了在完全外延的双MgAlOx势垒磁性隧道结中，Fe QW在室温下达到12纳米厚的QW共振态的证据。 由于Fe/MgAlOx界面处的小晶格失配导致的均匀界面相位偏移，使得这种QW中的电子相位相干性具有前所未有的高质量。 对界面应变在QW相位相干性中关键作用的物理理解将大大促进自旋依赖的量子共振隧穿应用的发展。 显示英文摘要

摘要： Double barrier heterostructures are model systems for the study of electron tunneling and discrete energy levels in a quantum well (QW). Until now resonant tunneling phenomena in metallicQW have been observed for limited thicknesses (1-2 nm) under which electron phase coherence is conserved. In the present study we show evidence of QW resonance states in Fe QW up to12 nmthick and at room temperature in fully epitaxial doubleMgAlOxbarrier magnetic tunnel junctions. The electron phase coherence displayed in this QWis of unprecedented quality because ofa homogenous interface phase shift due to the small lattice mismatch at the Fe/MgAlOx interface. The physical understanding of the critical role of interface strain on QW phase coherence will greatly promote the development of the spin-dependent quantum resonant tunneling applications.