论文标题
在强相关系统中，声子辅助相位分离
Phonon-assisted phase separation in strongly correlated systems
论文作者
论文摘要
我们将在许多晶体中观察到的相位分离与负电子可压缩性区域有明显的电子相关性。它们是在描述强电子相关性的几种模型中发现的。在低温下，这些区域发生在与位点在哈密顿量中的基态变化相对应的化学势。负电子可压缩性导致系统将系统分离为富电子和电子贫困域。在这种分离过程中释放的能量被声子吸收。声子的另一个作用是给出不同电子浓度的晶格扭曲和域，给出确定的形式 - 条纹或棋盘。此类纹理的形状，方向和周期性由晶格扭曲的波向量确定，这些晶格扭曲最强烈地散射电子。
We relate the phase separation observed in many crystals with pronounced electron correlations to the regions of negative electron compressibility. They were found in several models describing strong electron correlations. At low temperatures, these regions arise near chemical potentials corresponding to the change of the ground state in the site Hamiltonian. The negative electron compressibility leads to the separation of the system into electron-rich and electron-poor domains. The energy released in the course of this separation is absorbed by phonons. Another role of phonons is to give a definite form -- stripes or checkerboards -- to lattice distortions and domains of different electron concentrations. The shape, direction, and periodicity of such textures are determined by wave vectors of lattice distortions, which most strongly scatter electrons.
