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Terahertz plasmon waves amplifier with a double-layer graphene

Keywords:

M.Yu. Morozov – Ph.D. (Phys.-Math.), Senior Research Scientist, A.V. Kotelnikov IRE RAS(Saratov Branch)
I.M. Moiseenko - Post-graduate Student, Saratov State University
E-mail: MoiseenkoIM@yandex.ru
V.V. Popov – Dr.Sc. (Phys.-Math.), Head of Laboratory, A.V. Kotelnikov IRE RAS(Saratov Branch);
Professor, Saratov State University


Amplification of terahertz plasmon waves (plasmons) in a double-layer active (with inverted population of free charge carriers) graphene monolayers is studied theoretically. In symmetric double graphene layer structure plasmon splits into two branches with a symmetric and an antisymmetric distribution of tangential to graphene component of the electric field across the plane of symmetry of the structure. It is shown that normalized to the plasmon wavelength amplification factor of the symmetric plasmon mode in the double-layer graphene structure could be an order of magnitude greater than that in a single graphene layer.

References:
  1. Novoselov K.S., Fal′ko V.I., Colombo L., et al. // Nature. 2012. V. 490. P. 192.
  2. Aleshkin V.Ya., Dubinov A.A., Ryzhii V. // Pisma v JETF. 2009. V. 89. P. 70.
  3. Dubinov A.A., et al. // J. Phys.: Condens. Matter. 2011. V. 23. P. 145302.
  4. Morozov M.Yu., A. R. Davoyan, I. M. Moiseenko, A. Satou, T. Otsuji, V. V. Popov // Appl. Phys. Lett. 2015. V. 106. P. 061105.
  5. Gan C.H., Chu H.S., Li E.P. // Phys. Rev. B. 2012. V. 85. P. 125431.

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