电子分子极化激元的非平衡腔泵浦
Non-equilibrium cavity pumping of electronic molecular polaritons
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- Norwegian University of Science and Technology（挪威科技大学）
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中文总结 AI 辅助
本文提出用拉格朗日乘子约束光子数的QED Hartree-Fock方法，模拟单分子与多光子腔模的稳态，实现非平衡腔泵浦，并展示其可调控分子性质与相互作用。
中文摘要 AI 辅助
光学腔中的强光-物质耦合提供了一种非侵入性的途径来修改分子性质，通常通过将许多分子集体耦合到同一模式来实现。在此，我们考虑集体光子的对应情形，即单个分子与一个持有许多光子的腔模式（泵浦腔的稳态）相互作用。由于Pauli-Fierz哈密顿量的本征态不携带横向电场，这样的状态不能描述为光-物质系统的激发态。因此，我们通过拉格朗日乘子约束强耦合QED Hartree-Fock波函数的光子数，并相对于所有参数自洽地最小化能量。受约束的参考态携带一个具有平均光子数的相干态的场，该场由腔模式产生，其有效自由场频率被乘子降低。我们将此框架应用于苯和苯-水复合物，其中泵浦腔使分子极化并像静态经典场一样修改它们的相互作用。对于过氧化氢，该场可以重塑扭转势和远红外扭转光谱。经典驱动场极限因此从量子化平均场描述中涌现，光子密度成为腔修饰化学的控制参数。
英文摘要
Strong light-matter coupling in optical cavities offers a non-invasive route to modify molecular properties, and it is usually reached by collectively coupling many molecules to the same mode. Here we consider the photonic counterpart of the collective regime, in which a single molecule interacts with a cavity mode holding many photons, a steady state of the pumped cavity. Since the eigenstates of the Pauli-Fierz Hamiltonian carry no transverse electric field, such a state cannot be described as an excited state of the light-matter system. We therefore constrain the photon number of the strong coupling QED Hartree-Fock wave function with a Lagrange multiplier and self consistently minimize the energy with respect to all parameters. The constrained reference carries the field of a coherent state with an average number of photons, generated by a cavity mode whose effective free-field frequency is lowered by the multiplier. We apply this framework to benzene and a benzene-water complex, where the pumped cavity polarizes the molecules and modifies their interaction as with a static classical field. For hydrogen peroxide, the field can reshape the torsional potential and the far-infrared torsional spectrum. The classical driven field limit thus emerges from a quantized mean field description, and the photon density becomes a control parameter for cavity-modified chemistry.
