同轴纳米管中的赝自旋激发
Pseudospin excitations in coaxial nanotubes
摘要：
在一个二维电子气限制在两个同轴管的“管自由度”可以描述在pseudosin-1/2动力学。两个电子管之间的隧道效应导致了一种集体振荡，称为赝自旋共振。我们采用微扰理论来研究这种模式的频率相对于一个同轴磁场的情况下，小的管间距离的依赖关系。库仑相互作用导致的共振频率的移动和有限的寿命的赝自旋激发。同轴磁场的存在引起谐振频率偏移的显著峰值。对于大的磁场，由于塞曼分裂的影响，这种位移消失。最后导出了谐振线宽的表达式。该表达式的数值分析表明，线宽强烈依赖于同轴磁场，这导致几个峰值的线宽以及阻尼几乎完全抑制的区域。
英文摘要：
In a 2DEG confined to two coaxial tubes the `tube degree of freedom' can be described in terms of pseudospin-1/2 dynamics. The presence of tunneling between the two tubes leads to a collective oscillation known as pseudospin resonance. We employ perturbation theory to examine the dependence of the frequency of this mode with respect to a coaxial magnetic field for the case of small intertube distances. Coulomb interaction leads to a shift of the resonance frequency and to a finite lifetime of the pseudospin excitations. The presence of the coaxial magnetic field gives rise to pronounced peaks in the shift of the resonance frequency. For large magnetic fields this shift vanishes due to the effects of Zeeman splitting. Finally, an expression for the linewidth of the resonance is derived. Numerical analysis of this expression suggests that the linewidth strongly depends on the coaxial magnetic field, which leads to several peaks of the linewidth as well as regions where damping is almost completely suppressed.
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