Relaxation dynamics via acoustic phonons in carbon nanotubes

被引：3

作者：

Koehler, Christopher ^{[1
]}

Watermann, Tobias ^{[2
]}

Malic, Ermin ^{[1
]}

机构：

[1] Tech Univ Berlin, Inst Theoret Phys, D-10623 Berlin, Germany

[2] Free Univ Berlin, Dahlem Ctr Complex Quantum Syst, Dept Phys, D-14195 Berlin, Germany

来源：

PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS | 2012年 / 249卷 / 12期

关键词：

acoustic phonons; Boltzmann scattering; carbon nanotubes; non-equilibrium; relaxation times;

D O I：

10.1002/pssb.201200404

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We have investigated the efficiency of scattering processes through acoustic phonons in semiconducting nanotubes. Based on the density matrix formalism we obtain Boltzmann scattering equations, which give us a microscopic access to the time- and momentum-resolved relaxation dynamics of optically excited carriers. In agreement with a recent experiment [see Dyatlova et al., Nano Lett. 12, 2249 (2012)], we obtain relaxation times on the picosecond time scale. Here we study the importance of carrierphonon interaction as a function of probe energy and initial temperature for the exemplary (8,7) nanotube. Furthermore, we calculate the relaxation dynamics for nanotubes with different diameters focusing on the change in the relaxation time with the curvature of the corresponding energetically lowest conduction subband.

引用

页码：2483 / 2486

页数：4

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