发表机构
China Agricultural University; Renmin University of China（中国农业大学; 中国人民大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
该研究针对三角三量子点中循环电流随偏置反转的不明起源，提出耗散隧穿制备轨道赝自旋、虚拟电荷涨落产生兰姆场的机制，通过储库诱导的轨道 Hanle 效应将轨道极化转化为标量自旋手性，经层级计算验证了低偏置反转与手性进动的特性。
AI 中文摘要
三角三量子点中的循环电流即便在零磁通量和实哈密顿量的情况下也会随偏置反复反转，这一现象的起源一直不明确。我们证明，耗散隧穿会制备出轨道赝自旋，而虚拟电荷涨落会产生非共线的兰姆场，该场会将轨道赝自旋旋转到手性方向。偏置会改变它们的相对取向，从而反转电流。这种由储库诱导的轨道 Hanle 效应会将非手性的轨道极化转化为标量自旋手性，而精确的基态多重态恒等式将该手性与循环电流关联起来。运动方程的层级计算表明，低偏置反转在超出二阶弱耦合描述的范围内仍然存在，而突然电压切换后手性的二次增长则证实了进动。更广泛地说，时间反演奇响应可在开放量子系统中由耗散态制备与相干进动的相互作用产生。
英文摘要
Circulating currents in triangular triple quantum dots reverse repeatedly with bias even at zero magnetic flux and for a real Hamiltonian, a phenomenon whose origin has remained unclear. We show that dissipative tunneling prepares an orbital pseudospin, while virtual charge fluctuations generate a noncollinear Lamb field that rotates it toward the chiral direction. Bias changes their relative orientation and thereby reverses the current. This reservoir-induced orbital Hanle effect converts a nonchiral orbital polarization into scalar spin chirality, which an exact ground-multiplet identity links to the circulating current. Hierarchical-equations-of-motion calculations show that the low-bias reversal survives beyond the second-order weak-coupling description, while the quadratic growth of chirality after a sudden voltage switch identifies precession. More broadly, time-reversal-odd responses can emerge in open quantum systems from the interplay between dissipative state preparation and coherent precession.
