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Impurity enhanced coherent polarization of excitons in single‐walled zigzag nanotubes
Author(s) -
Peng Feng
Publication year - 2012
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201147467
Subject(s) - bosonization , exciton , zigzag , polarization (electrochemistry) , impurity , condensed matter physics , excitation , circular polarization , carbon nanotube , electron , physics , polarization rotator , materials science , magnetic field , birefringence , optics , quantum mechanics , chemistry , nanotechnology , geometry , mathematics , fermion
We study the effect of the impurity on the excitonic polarization in single‐walled zigzag carbon nanotubes under a laser field. The time evolutions of both the excitonic polarization and its fluctuation are calculated by introducing a bosonization scheme for the low energy excitation of interacting electron–hole system. Our calculations show that under certain conditions the excitons enter into the coherent states that the polarization fluctuation is equal to the one of the vacuum states, and the existence of the impurity can effectively enhance the coherent polarization of excitons.