论文标题
用于新型能量转化和超导性的大（BI）极性
Large (bi)polarons for novel energy conversion and superconductivity
论文作者
论文摘要
含有高密度异常可位移离子（例如钙钛矿）的材料的静态与高频介电常数的比例极高，>2。大极子以电子荷载体自陷入周围离子来形成诸如电子电荷载体的材料。巨大的极性子是非常沉重的缓慢移动的准颗粒，它们被周围的声子散布得非常弱。大偏振迁移率，例如在300 K处的1 cm2/v-SEC远小于常规电子电荷载体的最小值。有效质量M，EH/MKT的巡回电荷载体的最小迁移率发生在其平均值路径落到其de Broglie波长时，例如在室温下300 cm2/v-SEC，用于M等于自由电子质量。与众不同的是，频率依赖性电导率由两种贡献组成，这些贡献随着温度降低而分开。大型极性drude样贡献被降低到低于特征声子的频率。大极子自捕获电子载体的激发的贡献出现在特征声子上方。相对充满的大极大群在短范围内互相排斥。所得的抑制重组促进了异常高效的太阳能电池。相同电荷的大极性子在短范围内互相吸引，以使其真正的空间配对成单型双子双子龙。大双子龙之间的其他吸引力促进了它们的凝结成可能表现出超导性的液体。
Materials containing high densities of exceptionally displaceable ions (e.g. perovskites) have extremely large ratios of their static to high-frequency dielectric constants, > 2. Large polarons form in such materials as their electronic charge carriers self-trap by displacing surrounding ions. Large polarons are very heavy-massed slow-moving quasi-particles that are very weakly scattered by ambient phonons. Large-polaron mobilities, e.g. 1 cm2/V-sec at 300 K, are much smaller than the minimum possible for conventional electronic charge carriers. The minimum mobility for an itinerant charge carrier of effective mass m, eh/mkT, occurs when its mean-free-path falls to its de Broglie wavelength, e.g. 300 cm2/V-sec at room temperature for m equaling the free-electron mass. Distinctively, large-polarons frequency-dependent conductivities consist of two contributions that separate as the temperature is reduced. Large polarons Drude-like contributions are relegated to frequencies below those of characteristic phonons. Contributions from excitations of large polarons self-trapped electronic carriers occur above those of characteristic phonons. Oppositely charged large polarons repel one another at short range. The resulting suppressed recombination facilitates exceptionally efficient solar cells. Large polarons of the same charge attract one another at short range to enable their real-space pairing into singlet bipolarons. Additional attractions between large bipolarons facilitates their condensation into liquids that can exhibit superconductivity.
