线性原子链中的电子扭声：1000 km/s的化学能输运
Electronic torsional sound in linear atomic chains: chemical energy transport at 1000 km/s
摘要：
我们研究了线性累积分子链中的电子扭转振动模。堆积物的碳核沿着主轴定位，因此它们只能参与横向和纵向运动。然而，原子间的电子云表现为一个扭转弹簧，具有显着的扭转刚度。这些云的集体动力学可以用电子振动量子来描述，我们称之为扭曲。结果表明，由于电子的质量与原子质量相比很小，所以扭转子波包的群速度远高于典型的声速。出于同样的原因，在累积分子中的扭转子的最大能量高达几个电子伏特，而最小可能的能量被估计为几百个波数，这个最小值与零点原子振动的不对称性有关。分子系统的预测提出了实验评估。
英文摘要：
We investigate entirely electronic torsional vibrational modes in linear cumulene chains. The carbon nuclei of a cumulene are positioned along the primary axis so they can participate only in transverse and longitudinal motions. However, the interatomic electronic clouds behave as a torsion spring with remarkable torsional stiffness. The collective dynamics of these clouds can be described in terms of electronic vibrational quanta, which we name torsitons. It is shown that the group velocity of the wavepacket of torsitons is much higher than the typical speed of sound, because of the small mass of participating electrons compared to the atomic mass. For the same reason the maximum energy of the torsitons in cumulenes is as high as a few electronvolts, while the minimum possible energy is evaluated as a few hundred wavenumbers and this minimum is associated with asymmetry of zero point atomic vibrations. Molecular systems for experimental evaluation of the predictions are proposed.
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