Electroabsorption in a narrow gap semiconductor nanotube in the field of uniformly charged ring

• Interband and intraband electrooptical transitions in nanotube are considered.
• In the field of homogeneously charged ring.
• The field of the charged ring is brought to the field of the modified one dimensional Coulomb-like potential.

The electronic states as well as interband and intraband electrooptical transitions are considered for the narrow gap InSb nanotube in the field of homogeneously charged ring. The problem is solved in the framework of the variational approach. The field of the charged ring is brought to the field of the modified one dimensional Coulomb-like potential. Physically appropriate wave functions are suggested for this potential and the intensities of the threshold frequencies of the electrooptical transitions are calculated.