自旋分裂、Kondo相关性和单重-双重量子相变在超导耦合InSb纳米片量子点中
Spin splitting, Kondo correlation and singlet-doublet quantum phase transition in a superconductor-coupled InSb nanosheet quantum dot
AI总结：
该研究在InSb纳米片量子点中观察到自旋分裂、Kondo相关性和单重-双重量子相变，揭示了其在拓扑量子设备中的潜力。
摘要：
我们在InSb纳米片中实现了一个超导耦合量子点（QD），这是一种有前景用于研究拓扑超导性的二维平台。该装置由超导体-QD-超导体结组成，其中底部双层栅极定义了QD并允许调节其与超导电极的耦合。QD表现出大的g因子和强的自旋轨道耦合。传输测量揭示了具有偶-奇交替大小的库仑钻石状微分电导特征，并且有明显的电导线与超导能隙相关，证实了几个电子、超导耦合的 regime。在奇数电子占据时，Kondo特征出现，包括零偏峰，其在磁场下分裂，并在较高温度下被对数抑制。我们进一步观察到双重-单重量子相变，表现为Andreev束缚态从交叉到反交叉的明显变化，随着耦合强度的增加。这些结果突显了InSb纳米片QD丰富的物理性质及其在拓扑量子设备中的前景。
英文摘要：
We realize a superconductor-coupled quantum dot (QD) in an InSb nanosheet, a 2D platform promising for studies of topological superconductivity. The device consists of a superconductor-QD-superconductor junction, where a bottom bilayer gate defines the QD and allows tuning of its coupling to the superconducting leads. The QD exhibits large $g$-factors and strong spin-orbit coupling. Transport measurements reveal Coulomb diamond-shaped differential conductance features with even-odd alternating sizes and pronounced conductance lines associated with the superconducting gap, confirming a few-electron, superconductor-coupled regime. At an odd electron occupation, Kondo signatures emerge, including a zero-bias peak that splits with magnetic field and is logarithmically suppressed at elevated temperatures. We further observe a doublet-singlet quantum phase transition, manifested by a clear change of Andreev bound states from crossing to anticrossing as the coupling strength increases. These results underscore the rich physics of InSb nanosheet QDs and their promise for topological quantum devices.
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