Unidirectional coherent energy transport via conjugated oligo(p-phenylene) chains
Unidirectional coherent energy transport via conjugated oligo(p-phenylene) chains
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DOI：
10.1063/5.0046932
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发表时间：
2021-04-07
影响因子：
4.4
通讯作者：
Rubtsov, Igor V.
中科院分区：
文献类型：
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作者：
Leong, Tammy X.;Qasim, Layla N.;Rubtsov, Igor V.
我们发现了一种使用寡聚（对苯基）链在长距离上快速单向汇集高频振动量子的方法。在-COOH端基的中红外光子光激发后，多余的能量被有效地注入到链中，形成沿链自由传播的振动波包。这种传输方式提供的高能振动量子传输速度可达8.6 km/s，超过了普通金属（类似于5 km/s）和聚合物（类似于2 km/s）中的声速。能量注入链和沿链传递的效率非常高，并且依赖于整个结构的共轭程度。通过电子掺杂调节链的共轭度，可以控制输运速度和效率。这项研究为开发具有可控能量传输特性的材料开辟了道路，用于热管理，为难以到达的区域提供有效的能量输送方案，包括针对热梯度的传输，以及远程启动化学反应的方法。
We discovered a way to funnel high-frequency vibrational quanta rapidly and unidirectionally over large distances using oligo(p-phenylene) chains. After mid-IR photon photoexcitation of a -COOH end group, the excess energy is injected efficiently into the chain, forming vibrational wavepackets that propagate freely along the chain. The transport delivers high-energy vibrational quanta with a range of transport speeds reaching 8.6 km/s, which exceeds the speed of sound in common metals (similar to 5 km/s) and polymers (similar to 2 km/s). Efficiencies of energy injection into the chain and transport along the chain are found to be very high and dependent on the extent of conjugation across the structure. By tuning the degree of conjugation via electronic doping of the chain, the transport speed and efficiency can be controlled. The study opens avenues for developing materials with controllable energy transport properties for heat management, schemes with efficient energy delivery to hard-to-reach regions, including transport against thermal gradients, and ways for initiating chemical reactions remotely.