AI 中文总结
研究高迁移率准一维纳米缩颈中近藤自旋，通过光刻定义全片上电子谐振器和QPC，利用ER占据奇偶性控制相关自旋态，揭示0.7反常与近藤自旋单重态的不同，展示检测开放纳米缩颈内自发磁性杂质的非侵入性量子方法。
AI 中文摘要
当扩展到多个自旋杂质时，或者更有趣的是，当局域自旋本身可能已经是在假定为离域的开放纳米缩颈（如量子点接触（QPC））中多体相互作用的结果时，近藤自旋的确切性质仍然是个谜。在这样一个强关联系统中，将近藤态与其他共存的多体自旋态区分开来在实验上具有挑战性。在此，我们通过光刻在高迁移率的GaAs/AlGaAs异质结构晶体管中定义了一个全片上电子谐振器（ER）和一个QPC。QPC自旋的局域近藤屏蔽和跨ER - QPC集成的非局域自旋单重态可根据ER占据奇偶性进行控制。我们还表明，QPC中另一个强关联态——0.7反常，不仅有不同的物理起源，而且还抵消了近藤自旋单重态。这些结果展示了一种用于检测开放纳米缩颈内自发磁性杂质的非侵入性量子方法。
英文摘要
The precise nature of Kondo spins has remained enigmatic when extended to multiple spin impurities or, more intriguingly, when the localized spin itself may already be the consequence of many-body interactions in a presumably-delocalized open nanoconstriction, such as a quantum point contact (QPC). It is experimentally challenging to distinguish the Kondo state from other coexisting many-body spin states in such a strongly correlated system. Here we lithographically define an all-on-chip electronic resonator (ER) and a QPC in a high-mobility GaAs/AlGaAs heterostructure transistor. Local Kondo screening of the QPC spin and nonlocal spin singlet across the ER-QPC integration are controllable in response to ER occupancy parity. We also show that the 0.7 anomaly, another strongly-correlated state in QPCs, not only has a different physical origin but furthermore counteracts the Kondo spin singlet. These results demonstrate a noninvasive quantum method for sensing spontaneous magnetic impurities within an open nanoconstriction.
Comments18 pages, 4 figures
Journal refNano Letters 25, 7740-7747 (2025)
DOI：10.1021/acs.nanolett.5c00560
