AI 中文总结
该研究揭示量子多体系统中光可产生源于光吸收耗散的非保守静态力，在激子绝缘体和非公度电荷密度波材料中分别表现为激子凝聚体光子发射峰移动与直流电流产生的效应。
AI 中文摘要
在量子多体系统中，周期驱动通常可对慢集体自由度产生有效静态力。我们研究固体系统中光对电子序参量产生的静态力，发现该力可具有源于耗散（即光吸收）的非保守分量。该效应在两个非平凡实例中得到验证：其一，在激子绝缘体中，光场通过带间激发对激子序参量的相位产生非保守力，该力使相位加速，表现为激子凝聚体的光子发射峰发生移动；其二，在具有非公度电荷密度波的材料中，传播的光场对其序参量的相位产生非保守力，驱动电荷密度波进入滑动运动，通过拓扑Thouless泵浦产生直流电流。
英文摘要
In a quantum many-body system, a periodic drive can often generate effective static forces on the slow collective degrees of freedom. We study the static forces generated by light on electronic order parameters in solid-state systems. We show that the forces can have nonconservative components that originate from dissipation, i.e., optical absorption. This effect is demonstrated in two nontrivial examples. In excitonic insulators, via interband excitations, the light field generates a nonconservative force on the phase of the excitonic order parameter. This force leads to an acceleration of the phase, which manifests as a shift of the photon emission peak from an exciton condensate. In materials with an incommensurate charge density wave, a propagating light field generates a nonconservative force on the phase of its order parameter. It drives the charge density wave into sliding motion, leading to a DC electric current via topological Thouless pumping.
Comments9+13 pages, 3+2 figures
