论文标题
单分子连接处的电荷依赖状态振动松弛
Charge-state dependent vibrational relaxation in a single-molecule junction
论文作者
论文摘要
核和电子自由度之间的相互作用强烈影响分子电荷转运。在此，我们报告了通过卟啉二聚体分子的传输，该分子弱耦合到石墨烯电极，该分子在库仑阻滞状态内显示了顺序的隧穿。顺序传输是通过电流诱导的声子吸收来启动的，并通过非平衡振动分布的快速顺序转运进行。我们只有当振动耗散相对于顺序隧道速率缓慢并获得8 ns的振动弛豫时间的下限时，我们才能证明这是可能的，该值取决于分子电荷状态。
The interplay between nuclear and electronic degrees of freedom strongly influences molecular charge transport. Herein, we report on transport through a porphyrin dimer molecule, weakly coupled to graphene electrodes, that displays sequential tunneling within the Coulomb-blockade regime. The sequential transport is initiated by current-induced phonon absorption and proceeds by rapid sequential transport via a non-equilibrium vibrational distribution. We demonstrate this is possible only when the vibrational dissipation is slow relative to sequential tunneling rates, and obtain a lower bound for the vibrational relaxation time of 8 ns, a value that is dependent on the molecular charge state.
