二维晶体的铁电不稳定性
Ferroelectric instability of two-dimensional crystals
摘要：
介电晶体的宏观介电常数与组成原子的微观原子极化率通过19世纪中期获得的已知的Clausius-Mossotti关系相关联。我们推导出一个类似的关系，最近发现的二维晶体（单层和双层石墨烯，氮化硼等），并表明，在对比的三维材料，更强的电子-电子相互作用在两个维度导致自发的电极化的强度的基态的二维晶体。预测的铁电相变可能在电动力学和光学中有有趣的应用。
英文摘要：
The macroscopic dielectric permittivity of dielectric crystals is related to the microscopic atomic polarizability of constituent atoms by the known Clausius-Mossotti relation obtained in the middle of 19th century. We derive a similar relation for recently discovered two-dimensional crystals (mono- and bilayer graphene, boron nitride, etc) and show that, in contrast to three-dimensional materials, much stronger electron-electron interaction in two dimensions leads to a spontaneous electric polarization of the ground state of two-dimensional crystals. The predicted ferroelectric transition may have interesting applications in electrodynamics and optics.
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