将双量子点中的塞曼分裂转变为可切换的电荷极化
Turning Zeeman splitting into switchable charge polarization in a double quantum dot
AI总结：
该研究通过保对称格林函数运动方程方法，揭示均匀塞曼场可反转非对称开放双量子点的单电子电荷极化，确立了固定静电失谐下磁控电荷极化的机制。
AI中文摘要：
通常认为，对两个量子点产生相同作用的磁场不会在它们之间转移电荷。然而，我们证明均匀塞曼场可强烈重构甚至反转非对称开放双量子点的单电子电荷极化。采用保对称性的格林函数运动方程方法，我们确定了 preferred 点占据反转且系统仍处于单电子电荷区域的参数区间。两种不同机制导致该行为：不等的栅极能级产生不同的占据响应，因为塞曼移位的共振相对于库化学势处于不同位置；而不等的在位相互作用通过多体加和谱区分两个量子点。库仑阻塞稳定了单电子区域，使库介导的响应表现为空间电荷再分布而非总占据的变化。我们的结果确立了在固定静电失谐下磁控电荷极化的机制。
英文摘要：
A magnetic field that acts identically on two quantum dots is not expected to move charge between them. Nevertheless, we show that a uniform Zeeman field can strongly reconfigure and even reverse the single-electron charge polarization of an asymmetric open double quantum dot. Using a symmetry-preserving Green's-function equation-of-motion approach, we identify regimes where the preferred dot occupation reverses while the system remains in the single-electron charge sector. Two distinct mechanisms produce this behavior. Unequal gate levels produce different occupation responses because the Zeeman-shifted resonances lie at different positions relative to the reservoir chemical potential, whereas unequal onsite interactions distinguish the dots through their many-body addition spectra. Coulomb blockade stabilizes the single-electron sector, causing the reservoir-mediated response to appear as spatial charge redistribution rather than a change in total occupation. Our results establish a mechanism for magnetic control of charge polarization at fixed electrostatic detuning.
