论文标题
驱动的安德森杂质模型中的Kondo纳米力学耗散
Kondo nanomechanical dissipation in the driven Anderson impurity model
论文作者
论文摘要
最近显示，磁性杂质从昆多到非kondo状态的循环突然切换涉及每个周期几个$ k_bt_k $的重要耗散。通过例如通过纳米力学耗散来揭示此和其他电子过程的可能性，例如，超敏感的原子力显微镜（AFM）工具当前代表了一种异常且有趣的光谱形式。在这里，我们探讨了对预期耗散的切换时间的依赖性，该数量的数量在物理上的幅度分别在突然和慢速切换之间从最大降至零。通过将基于时间依赖的矩阵产物状态算法应用于磁场模型中的磁场诱导的丘多切换，我们发现耗散需要在近kondo时时间尺度$ \ hbar（k_b t_k）^{ - 1} $或faster中进行切换。尽管对于当前的AFM设置，这种快速切换似乎有问题，但对于以后的手段而言，挑战是通过时间相关的磁场，静电杂质级别移动或杂交切换来检测这种耗散的挑战。
The cyclic sudden switching of a magnetic impurity from Kondo to a non-Kondo state and back was recently shown to involve an important dissipation of the order of several $k_BT_K$ per cycle. The possibility to reveal this and other electronic processes through nanomechanical dissipation by e.g., ultrasensitive Atomic Force Microscope (AFM) tools currently represents an unusual and interesting form of spectroscopy. Here we explore the dependence on the switching time of the expected dissipation, a quantity whose magnitude is physically expected to drop from maximum to zero between sudden and slow switching, respectively. By applying a recently established matrix-product-state based time-dependent variational algorithm to the magnetic field-induced Kondo switching in an Anderson model of the magnetic impurity, we find that dissipation requires switching within the Kondo time scale $\hbar(k_B T_K)^{-1}$ or faster. While such a fast switching seems problematic for current AFM setups, the challenge is open for future means to detect this dissipation by time-dependent magnetic fields, electrostatic impurity level shift, or hybridization switching.
