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arXiv 0908.1400cond-mat.mtrl-scicond-mat.mes-hall
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InAs量子点分子中的空穴自旋混合

Hole Spin Mixing in InAs Quantum Dot Molecules

M. F. Doty, J. I. Climente, A. Greilich, A. S. Bracker, D. Gammon

摘要:

单InAs量子点中的空穴是近年来出现的一种很有前途的量子信息存储和处理系统。这些空穴通常被假设为只有重空穴的特征,并进一步假设在正交重空穴自旋投影之间没有混合(在没有横向磁场的情况下)。相同的假设已经应用于由两个堆叠的InAs量子点形成的InAs量子点分子,所述两个堆叠的InAs量子点通过两个点之间的空穴的相干隧穿耦合。我们提出了通过磁光致发光光谱在此类InAs量子点分子上获得的空穴自旋混合项存在的实验证据。我们使用Luttinger旋量模型来解释这个孔自旋混合项的物理起源:沿着堆叠方向的点的不对准打破了角对称性,并允许通过旋量的光孔分量进行混合。我们讨论了这种新的自旋混合机制可能提供新的自旋操纵的机会,是独特的洞。

英文摘要:

Holes confined in single InAs quantum dots have recently emerged as a promising system for the storage or manipulation of quantum information. These holes are often assumed to have only heavy-hole character and further assumed to have no mixing between orthogonal heavy hole spin projections (in the absence of a transverse magnetic field). The same assumption has been applied to InAs quantum dot molecules formed by two stacked InAs quantum dots that are coupled by coherent tunneling of the hole between the two dots. We present experimental evidence of the existence of a hole spin mixing term obtained with magneto-photoluminescence spectroscopy on such InAs quantum dot molecules. We use a Luttinger spinor model to explain the physical origin of this hole spin mixing term: misalignment of the dots along the stacking direction breaks the angular symmetry and allows mixing through the light-hole component of the spinor. We discuss how this novel spin mixing mechanism may offer new spin manipulation opportunities that are unique to holes.

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