光泵声子电子压缩的瞬态超导性
Transient superconductivity from electronic squeezing of optically pumped phonons
摘要：
光源和时间分辨光谱学的进步使得激发固体中特定的原子振动并观察由此产生的电子性质的变化成为可能，但声子激发引起电子性质质变的机制仍不清楚。在这里，我们表明，占主导地位的电子密度和偶极有源模式之间的耦合意味着电子密度相关的压缩的声子状态，提供了一个有吸引力的贡献的电子-电子相互作用，独立的裸电子-声子耦合的符号和大小成比例的程度的激光诱导的声子激发。合理的激发振幅导致不可忽略的吸引相互作用，这可能会导致显着的瞬态变化的电子特性，包括超导性。该机制一般适用于广泛的系统，提供了一个很有前途的路线操纵和控制新材料中的电子相行为。
英文摘要：
Advances in light sources and time resolved spectroscopy have made it possible to excite specific atomic vibrations in solids and to observe the resulting changes in electronic properties but the mechanism by which phonon excitation causes qualitative changes in electronic properties, has remained unclear. Here we show that the dominant symmetry-allowed coupling between electron density and dipole active modes implies an electron density-dependent squeezing of the phonon state which provides an attractive contribution to the electron-electron interaction, independent of the sign of the bare electron-phonon coupling and with a magnitude proportional to the degree of laser-induced phonon excitation. Reasonable excitation amplitudes lead to non-negligible attractive interactions that may cause significant transient changes in electronic properties including superconductivity. The mechanism is generically applicable to a wide range of systems, offering a promising route to manipulating and controlling electronic phase behavior in novel materials.
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