论文标题
在准碘电势中相互作用的玻色子的非线性响应
Non-linear response of interacting bosons in a quasiperiodic potential
论文作者
论文摘要
从理论上讲，我们研究了在没有不超过的超晶格电位的情况下，在光学晶格中加载的相互作用玻色子的电动脉动驱动的非线性反应。在非相互作用的限制$（u = 0）$中，该模型根据不兑换潜在的$ v_0 $的强度来接受本地化和离界阶段。我们表明，与鉴定出均匀和奇数谐波的局部相比，粒子电流在离域相中仅包含奇数。这些偶数的相对大小，峰值谐波和峰的清晰度可以通过不同的频率和施加脉冲的循环数来调节。在出现排斥相互作用的情况下，偶数和奇数的幅度进一步取决于相互作用$ u $的相对优势和潜在的$ v_0 $。我们说明，可以通过粒子电流来区分和表征疾病和相互作用引起的相位。最后，我们讨论了电场引起的激发的动力学，负责在当前光谱中表现出较高的谐波。
We theoretically study the electric pulse-driven non-linear response of interacting bosons loaded in an optical lattice in the presence of an incommensurate superlattice potential. In the non-interacting limit $(U=0)$, the model admits both localized and delocalized phases depending on the strength of the incommensurate potential $V_0$. We show that the particle current contains only odd harmonics in the delocalized phase in contrast to the localised phase where both even and odd harmonics are identified. The relative magnitudes of these even and odd harmonics and sharpness of the peaks can be tuned by varying frequency and the number of cycles of the applied pulse, respectively. In the presence of repulsive interactions, the amplitudes of the even and odd harmonics further depend on the relative strengths of the interaction $U$ and the potential $V_0$. We illustrate that the disorder and interaction-induced phases can be distinguished and characterized through the particle current. Finally, we discuss the dynamics of field induced excitation responsible for exhibiting higher harmonics in the current spectrum.
