通过量子点中的多重 Kondo 跃迁揭示隐藏的共振
Unhiding a concealed resonance by multiple Kondo transitions in a quantum dot
AI总结：
本文通过碳纳米管磁输运实验，发现由不对称隧穿耦合和电势降驱动的赝自旋不守恒跃迁增强，揭示了Kondo系统中隐藏的共振特征及其微观机制。
摘要：
Kondo 关联导致库仑阻塞量子点在低温下的微分电导中出现零偏压峰。在碳纳米管中可实现的全局 SU(2)$\otimes$SU(2) 对称性下，它们还会抑制与该对称性相关的 Kramers 赝自旋守恒的非弹性跃迁。我们报告了 Kondo 关联碳纳米管的磁输运实验，在对应于赝自旋守恒跃迁的偏压处观察到了共振特征。我们将此效应归因于该偏压下赝自旋不守恒跃迁的同步增强。该过程由两个 Kramers 双重态与导线的不对称隧穿耦合及导线处的电势降不对称性所驱动。因此，本研究揭示了支配远离平衡态的 Kondo 系统输运的基本微观机制。
英文摘要：
Kondo correlations are responsible for the emergence of a zero-bias peak in the low temperature differential conductance of Coulomb blockaded quantum dots. In the presence of a global SU(2)$\otimes$SU(2) symmetry, which can be realized in carbon nanotubes, they also inhibit inelastic transitions which preserve the Kramers pseudospins associated to the symmetry. We report on magnetotransport experiments on a Kondo correlated carbon nanotube where resonant features at the bias corresponding to the pseudospin-preserving transitions are observed. We attribute this effect to a simultaneous enhancement of pseudospin-non-preserving transitions occurring at that bias. This process is boosted by asymmetric tunneling couplings of the two Kramers doublets to the leads and by asymmetries in the potential drops at the leads. Hence, the present work discloses a fundamental microscopic mechanisms ruling transport in Kondo systems far from equilibrium.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
