库仑阻塞悬浮碳纳米管中振动激发的泵浦
Pumping of vibrational excitations in a Coulomb blockaded suspended carbon nanotube
摘要：
对悬浮的少孔碳纳米管量子点的低温输运谱进行了测量，发现了一个与门相关的谐波激发谱，该谱发生在库仑阻塞区。量子化的激发能对应于纳米管的纵向振动所预期的尺度。电子输运过程被确定为cotunnel辅助顺序隧穿，导致非平衡占领的机械模式。它们只出现在电子纳米管激发的尺度上的高偏置阈值之上。我们讨论模型的泵送过程，解释增强的非平衡占领，并表明它是连接到一个微妙的相互作用之间的电子和振动自由度。
英文摘要：
Low-temperature transport spectroscopy measurements on a suspended few-hole carbon nanotube quantum dot are presented, showing a gate-dependent harmonic excitation spectrum which, strikingly, occurs in the Coulomb blockade regime. The quantized excitation energy corresponds to the scale expected for longitudinal vibrations of the nanotube. The electronic transport processes are identified as cotunnel-assisted sequential tunneling, resulting from non-equilibrium occupation of the mechanical mode. They appear only above a high-bias threshold at the scale of electronic nanotube excitations. We discuss models for the pumping process that explain the enhancement of the non-equilibrium occupation and show that it is connected to a subtle interplay between electronic and vibrational degrees of freedom.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
