论文标题
AC驱动的正常Mott构造量子点阵列中的超导体样效应
Superconductor-like effects in an AC driven normal Mott-insulating quantum dot array
论文作者
论文摘要
我们使用分析性的Keldysh场理论方法研究了AC驱动的耗散性Mott绝缘体系统（正常量子点阵列）的当前响应。在莫特绝缘体状态下，非平衡稳态（NESS）响应类似于电阻分流的约瑟夫森阵列，随着驱动频率ω的增加，无序的莫特向导体过渡产生了绝缘。在传导阶段，NESS的磁性成分是异常的，这意味着负电感，令人惊讶地让人联想到约瑟夫森阵列的ηpairing阶段，具有负相位刚度。但是，在存在额外的直流场的情况下，超高潮的签名 - 夏皮罗步骤 - 完全不存在。我们将这些属性解释为与约瑟夫森系统共有的数字波动效应，而不是超导性。
We study the current response of an AC driven dissipative Mott insulator system, a normal quantum dot array, using an analytical Keldysh field theory approach. Deep in the Mott insulator regime, the nonequilibrium steady state (NESS) response resembles a resistively shunted Josephson array, with a nonequilibrium Mott insulating to conductor transition as the drive frequency Ω is increased. The diamagnetic component of the NESS in the conducting phase is anomalous, implying negative inductance, strikingly reminiscent of the η-pairing phase of a Josephson array with negative phase stiffness. However in the presence of an additional DC field the signature of supercurrent - Shapiro steps - is completely absent. We interpret these properties as number-phase fluctuation effects shared with Josephson systems rather than superconductivity.
