二维近藤晶格中量子相变的腔调控
Cavity control of quantum phase transitions in a two-dimensional Kondo lattice
AI总结：
该研究利用腔量子电动力学，通过腔诱导的导带动量依赖自能，调控二维近藤晶格的重费米子相与反铁磁相之间的量子相变，揭示了电磁场真空涨落对强关联二维近藤材料的调控作用。
AI中文摘要：
腔量子电动力学提供了一种利用受限电磁场的真空涨落来调控量子相的途径。特别是，基于极性范德华材料的平面腔可产生强受限模式，有望用于调控二维关联材料。最近，莫尔材料已成为研究二维重费米子系统及其量子相变的核心平台。近藤晶格是研究量子相边界的原型模型，其由近藤屏蔽与局域磁矩有序化之间的竞争驱动。我们表明，腔诱导的相互作用可通过导带的动量依赖自能，改变二维近藤晶格中重费米子相与反铁磁相之间的量子相变。对于由h-BN双曲声子极化激元激发的纵向投影场，该自能有利于近藤杂化，扩大重费米子区域；横向和面内圆形模型结构则产生不同效应，横向情况相对有利于磁有序相，圆形情况介于纵向和横向情况之间。这些结果表明，电磁场真空涨落可有效调控强关联二维近藤材料的控制参数。
英文摘要：
Cavity quantum electrodynamics offers a route to control quantum phases by using vacuum fluctuations of confined electromagnetic fields. In particular, planar cavities based on polar van der Waals materials can generate strongly confined modes and are promising for controlling two-dimensional correlated materials. Recently, moiré materials have become central platforms for studying two-dimensional heavy-fermion systems and their quantum phase transitions. Kondo lattices provide a prototypical model for studying quantum phase boundaries, driven by competition between Kondo screening and the ordering of local magnetic moments. We show that a cavity-induced interaction can shift the quantum phase transitions between a heavy-fermion phase and an antiferromagnetic phase in a two-dimensional Kondo lattice through a momentum-dependent self-energy of the conduction bands. For the longitudinal projected field motivated by h-BN hyperbolic phonon polaritons, the self-energy favors Kondo hybridization and expands the heavy-fermion region. Transverse and circular in-plane model structures give distinct effects, with the transverse case relatively favoring the magnetically ordered phase and the circular case lying between the longitudinal and transverse cases. These results indicate that electromagnetic vacuum fluctuations can effectively modify the control parameters of strongly correlated two-dimensional Kondo materials.
