论文标题
稳定的偏置长距离订单状态在一个谐振脉冲场引起的半熔化的哈伯德链中
Steady off-diagonal long-range order state in a half-filled dimerized Hubbard chain induced by a resonant pulsed field
论文作者
论文摘要
我们表明，即使在二聚体哈伯德模型的深莫特绝缘阶段，谐振脉冲场也可以诱导稳定的超导状态。此处在非平衡稳态下发现的超导性是由于$η$ pairing机制所致，其特征是存在非对角线长距离阶（ODLRO），并且在地面相图中不存在。该方案的关键在于来自价值键固体的场诱导的电荷密度波（CDW）状态的产生。该状态的动力学位于二聚哈伯德模型的高度激发的子空间中，并由$η$ -Spin铁磁模型主导。由于节能，这种悠久的激发的衰减被抑制。我们还开发了一种动态方法来检测非平衡稳态的ODLRO。我们的发现表明，由谐振外场与电子电子相互作用之间相互作用引起的非平衡多体动力学是访问新的外来量子状态的替代途径，并且还提供了增强超导性的替代机制。
We show that a resonant pulsed field can induce a steady superconducting state even in the deep Mott insulating phase of the dimerized Hubbard model. The superconductivity found here in the non-equilibrium steady state is due to the $η$-pairing mechanism, characterized by the existence of the off-diagonal long-range order (ODLRO), and is absent in the ground-state phase diagram. The key of the scheme lies in the generation of the field-induced charge density wave (CDW) state that is from the valence bond solid. The dynamics of this state resides in the highly-excited subspace of dimerized Hubbard model and is dominated by a $η$-spin ferromagnetic model. The decay of such long-living excitation is suppressed because of energy conservation. We also develop a dynamical method to detect the ODLRO of the non-equilibrium steady state. Our finding demonstrates that the non-equilibrium many-body dynamics induced by the interplay between the resonant external field and electron-electron interaction is an alternative pathway to access a new exotic quantum state, and also provides an alternative mechanism for enhancing superconductivity.
