论文标题
量子关键顺序的Kapitza稳定
Kapitza stabilization of quantum critical order
论文作者
论文摘要
动态扰动以令人惊讶的方式修改了古典系统的状态，并在科学和技术中引起了重要的应用。例如，当对诸如弹簧常数等参数施加强大的周期性变化时，Floquet Engineering利用了频域中频带形成的可能性。我们在这里描述了Kapitza工程，在该系统的频率上，驱动场振荡远比系统的线性响应的特征频率高得多，以至于在平衡时发现的Maxima在平衡上发现的Maxima以与著名的Kapitza pendulum相比，与质量的Kapitza pendulum相比，相比之下，相比之上，与下面的质量相比，与下面的质量相比，它与下面的质量相比，而不是在下面的下面，而不是在下面的情况下，而不是在下面的情况下，而不是在下面的范围。我们的起点是Ginzburg-Devonshire类型的量子场理论，适用于许多冷凝物质系统，包括特别是铁电和量子paralectrics。我们表明，由激光驱动的THZ源产生的异位振荡电场可以在量子关键极限下诱导铁电顺序。估计使用脉冲辐射估计加热效果是可管理的。 ``hidden" radiation-induced order can persist to low temperatures without further pumping due to stabilization by strain. We estimate the Ginzburg-Devonshire free-energy coefficients in SrTiO${}_{3}$ using density-functional theory (DFT) and the stochastic self-consistent harmonic approximation accelerated by a machine-learned force field. Although we find that srtio $ {} _ {3} $不是Kapitza稳定的最佳选择，我们表明可以在计算方便的密度密度功能理论水平上进行进一步的候选材料。
Dynamical perturbations modify the states of classical systems in surprising ways and give rise to important applications in science and technology. For example, Floquet engineering exploits the possibility of band formation in the frequency domain when a strong, periodic variation is imposed on parameters such as spring constants. We describe here Kapitza engineering, where a drive field oscillating at a frequency much higher than the characteristic frequencies for the linear response of a system changes the potential energy surface so much that maxima found at equilibrium become local minima, in precise analogy to the celebrated Kapitza pendulum where the unstable inverted configuration, with the mass above rather than below the fulcrum, actually becomes stable. Our starting point is a quantum field theory of the Ginzburg-Devonshire type, suitable for many condensed matter systems, including particularly ferroelectrics and quantum paralectrics. We show that an off-resonance oscillatory electric field generated by a laser-driven THz source can induce ferroelectric order in the quantum-critical limit. Heating effects are estimated to be manageable using pulsed radiation; ``hidden" radiation-induced order can persist to low temperatures without further pumping due to stabilization by strain. We estimate the Ginzburg-Devonshire free-energy coefficients in SrTiO${}_{3}$ using density-functional theory (DFT) and the stochastic self-consistent harmonic approximation accelerated by a machine-learned force field. Although we find that SrTiO${}_{3}$ is not an optimal choice for Kapitza stabilization, we show that scanning for further candidate materials can be performed at the computationally convenient density-functional theory level. We suggest second-harmonic-generation, soft-mode-spectroscopy, and X-ray-diffraction experiments to characterize the induced order.
