Phonon-assisted transport through suspended carbon nanotube quantum dots
Phonon-assisted transport through suspended carbon nanotube quantum dots
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DOI：
10.1103/physrevb.84.155417
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发表时间：
2011-10
影响因子：
3.7
通讯作者：
Tie-Feng Fang;Qing-feng Sun;Hong-Gang Luo
中科院分区：
文献类型：
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作者：
Tie-Feng Fang;Qing-feng Sun;Hong-Gang Luo
受最近几个实验的启发，我们研究了声子在悬浮碳纳米管量子点中的电子辅助输运，包括电子-电子、电子-声子和自旋-轨道相互作用。通过有效地解耦电子和声子的热力学，我们给出了令人困惑的热致振动吸收边带的解释，并进一步预测了部分填充的库仑金刚石中这些吸收边带由于电子和空穴状态的破坏性叠加而明显减弱。自旋-轨道耦合分裂了所有声子辅助的边带，而保持了Kramers简并。有趣的是，在强自旋-轨道耦合区域，一些分裂吸收边带被库仑阻塞效应抑制，而所有分裂发射边带始终存活。
Motivated by several recent experiments, we investigate phonon-assisted electronic transport through suspended carbon nanotube quantum dots including electron-electron, electron-phonon, and spin-orbit interactions. By effectively decoupling the electron and phonon thermodynamics, we present an explanation for the puzzling thermoinduced vibrational absorption sidebands, as well further predict that these absorption sidebands are obviously diminished in the partially filled Coulomb diamonds due to the destructive superposition of electron and hole states. The spin-orbit coupling is shown to split all phonon-assisted sidebands while the Kramers degeneracy remains. Interestingly, in the strong spin-orbit coupling regime, some split absorption sidebands are suppressed by the Coulomb blockade effect, while all split emission sidebands always survive.