论文标题
在强PEIERLS电子波耦合处的双极液体
Bipolaron liquids at strong Peierls electron-phonon couplings
论文作者
论文摘要
我们使用密度矩阵重新归一化组方法来研究使用PEIERLS Electron-Phonon耦合的一维链，该链描述了通过晶格扭曲对电子跳跃的调节。我们证明，该系统在稀密度极限内对相位分离是稳定的。我们仅在数值上发现相位分离，以使电子偶联的线性近似无效。如果仔细调节声子的分散，则可以在物理参数空间的狭窄片段中稳定这种行为。这些结果表明，在稀释的电子密度极限中，PEIERLS双极液体通常稳定，这与其他电子偶联模型不同。我们表明，这种行为扩展到有限的载体浓度，最多是四分之一填充。 PEIERLS模型中低密度，轻质双质液体液体的稳定性为基于双极性机制的高$ t_c $超导率开辟了一条路径。
We use the Density Matrix Renormalization Group method to study a one-dimensional chain with Peierls electron-phonon coupling, which describes the modulation of the electron hopping by lattice distortions. We demonstrate that this system is stable against phase separation in the dilute density limit. We only find phase separation numerically for large couplings for which the linear approximation for the electron-phonon coupling becomes invalid; this behavior can be stabilized in a narrow sliver of the physical parameter space if the dispersion of the phonons is carefully tuned. These results indicate that in the dilute electron density limit, Peierls bipolaron liquids are generically stable, unlike in other models of electron-phonon coupling. We show that this behavior extends to finite carrier concentrations of up to quarter filling. This stability of low-density, light-mass bipolaron liquids in the Peierls model opens a path to high-$T_c$ superconductivity based on a bipolaronic mechanism, in higher dimensions.
