论文标题
掺杂的量子paraelectrics中的准粒子和非Quasiparticle运输
Quasiparticle and Nonquasiparticle Transport in Doped Quantum Paraelectrics
论文作者
论文摘要
掺杂的量子paralectrics（QP）中的电荷运输呈现出许多难题，包括电阻率明显的$ t^2 $制度。我们通过两次响应机制在QP中分析了QP中的电荷传输。对于超过软模式频率的$ t $，但低于某些特征刻度（$ e_0 $），电阻率刻度具有正方形的职业数量，即$ t^2 $。 $ t^2 $散射率不取决于载体数量密度，并且不受与实验一致的退化和非分类状态之间的交叉影响。高于$ e_0 $的温度对应于非quasiparticle制度，我们通过将dyson方程映射到超对称量子力学的问题来分析。两个两个散射与声子和纵向光学模式的组合很好地解释了数据。
Charge transport in doped quantum paralectrics (QPs) presents a number of puzzles, including a pronounced $T^2$ regime in the resistivity. We analyze charge transport in a QP within a model of electrons coupled to a soft transverse optical (TO) mode via a two-phonon mechanism. For $T$ above the soft-mode frequency but below some characteristic scale ($E_0$), the resistivity scales with the occupation number of phonons squared, i.e., as $T^2$. The $T^2$ scattering rate does not depend on the carrier number density and is not affected by a crossover between degenerate and non-degenerate regimes, in agreement with the experiment. Temperatures higher than $E_0$ correspond to a non-quasiparticle regime, which we analyze by mapping the Dyson equation onto a problem of supersymmetric quantum mechanics. The combination of scattering by two TO phonons and by a longitudinal optical mode explains the data quite well.
