Theory of Laser-Controlled Competing Superconducting and Charge Orders.
Theory of Laser-Controlled Competing Superconducting and Charge Orders.
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激光控制竞争超导和电荷序理论
DOI：
10.1103/physrevlett.118.087002
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发表时间：
2017
影响因子：
8.6
通讯作者：
C. Kollath
中科院分区：
文献类型：
--
作者：
M. A. Sentef;A. Tokuno;A. Georges;C. Kollath
本文研究了Hubbard模型中超导序和电荷密度波序竞争共存的非平衡动力学。时间周期激光场提升了SC-CDW简并度，因为CDW与场线性耦合（），而SC由于规范不变性而以二阶耦合（）。这导致了一个惊人的共振：当光子能量与平衡单粒子能隙相比是红色失谐时，CDW被增强，SC被抑制，而这种行为在蓝色失谐时相反。这两个订单振荡的新兴慢频率，这是由第三个诱导订单，namelypairing，由两个初级订单的交换子给出的小振幅控制。诱导配对控制的优势订单的增强和抑制。最后，我们证明了光诱导超导性是可能的，从一个占主导地位的CDW初始状态。
We investigate the nonequilibrium dynamics of competing coexisting superconducting (SC) and charge-density wave (CDW) orders in an attractive Hubbard model. A time-periodic laser fieldlifts the SC-CDW degeneracy, since the CDW couples linearly to the field (), whereas SC couples in second order () due to gauge invariance. This leads to a striking resonance: When the photon energy is red detuned compared to the equilibrium single-particle energy gap, CDW is enhanced and SC is suppressed, while this behavior is reversed for blue detuning. Both orders oscillate with an emergent slow frequency, which is controlled by the small amplitude of a third induced order, namelypairing, given by the commutator of the two primary orders. Theinducedpairing is shown to control the enhancement and suppression of the dominant orders. Finally, we demonstrate that light-induced superconductivity is possible starting from a predominantly CDW initial state.
影响因子：
3.7
作者：
Hussey, NE;Nozawa, K;Tanabe, K
通讯作者：
Tanabe, K