三角形三重量子点中的电荷阻挫
Charge frustration in a triangular triple quantum dot
摘要：
实验研究了三角形三重量子点中几何对称性引起的电荷（同位旋）阻挫。我们观察到基态电荷配置的六倍简并，表现的挫折。在电荷稳定性图中，这种阻挫导致了全方向的电荷输运，并伴随着附近的非平凡三重简并态。研究结果与电容相互作用模型一致。我们还观察到不寻常的运输的挫折，这可能与弹性cotunneling和通过点的轨迹的干扰。这项工作展示了一种独特的方式研究几何挫折的可控方式。
英文摘要：
We experimentally investigate the charge (isospin) frustration induced by a geometrical symmetry in a triangular triple quantum dot. We observe the ground-state charge configurations of six-fold degeneracy, the manifestation of the frustration. The frustration results in omnidirectional charge transport, and it is accompanied by nearby nontrivial triple degenerate states in the charge stability diagram. The findings agree with a capacitive interaction model. We also observe unusual transport by the frustration, which might be related to elastic cotunneling and the interference of trajectories through the dot. This work demonstrates a unique way of studying geometrical frustration in a controllable way.
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