Scharf, Benedikt / B and Fabian, Jaroslav and Matos-Abiague, Alex (2009) Pseudospin excitations in coaxial nanotubes. Physical Review B (PRB). (Submitted)
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Other URL: http://arxiv.org/abs/0910.2552
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.
|Date:||14 October 2009|
|Institutions:||Physics > Institute of Theroretical Physics > Chair Professor Richter > Group Jaroslav Fabian|
|Projects:||SFB 689: Spinphänomene in reduzierten Dimensionen, GRK 638 Nonlinearity and nonequilibrium in condensed matter|
|Keywords:||collective excitations, pseudospintronics, ferromagnetic resonance|
|Subjects:||500 Science > 530 Physics|
|Refereed:||No, this version has not been refereed yet (as with preprints)|
|Created at the University of Regensburg:||Yes|
|Owner:||Prof. Dr. Jaroslav Fabian|
|Deposited On:||20 Oct 2009 12:16|
|Last Modified:||27 Aug 2012 13:12|