铁电量子临界点附近电子与TO声子的非谐耦合
Anharmonic coupling between electrons and TO phonons in the vicinity of ferroelectric quantum critical point
摘要：
我们探索了一种新的耦合机制的电子与横向光学（TO）声子分支的制度时，TO模式变得高度非谐，并驱动铁电相变。我们表明，这种非谐性，这导致了集体运动的离子，是能够耦合电子和晶格位移场。需要一种有效的相关电子-离子动力学方法来捕获由于接近量子临界点的这种集体行为而引起的局部电极化的强度的开始的影响。我们确定了一个中间的温度范围内出现的声子阻力可能会大大有助于在此制度的热电电导率。我们发现，在最佳条件下，这种额外的贡献可能大于迄今为止在基准材料PbTe中实现的值。在最后一部分中，我们使我们的结果在非谐电子晶格动力学的一般问题的重要性。
英文摘要：
We explore a novel coupling mechanism of electrons with the transverse optical (TO) phonon branch in a regime when the TO mode becomes highly anharmonic and drives the ferroelectric phase transition. We show that this anharmonicity, which leads to a collective motion of ions, is able to couple electronic and lattice displacement fields. An effective correlated electron-ion dynamics method is required to capture the effect of the onset of the local electric polarization due to this collective behavior close to the quantum critical point. We identify an intermediate temperature range where an emergent phonon drag may contribute substantially to thermoelectric conductivity in this regime. We find that, under optimal conditions, this extra contribution may be larger than values achieved so far in the benchmark material, PbTe. In the last part we make a case for the importance of our results in the generic problem of anharmonic electron-lattice dynamics.
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