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Paper   IPM / Nano-Sciences / 14735
School of Nano Science
  Title:   Phonon induced optical gain in a current carrying two-level quantum dot
  Author(s):  Amir Eskandari-asl
  Status:   Published
  Journal: Physica B
  Vol.:  513
  Year:  2017
  Pages:   82
  Publisher(s):   Elsevier. Ltd
  Supported by:  IPM
In this work we consider a current carrying two level quantum dot(QD) that is coupled to a single mode phonon bath. Using self-consistent Hartree-Fock approximation, we obtain the I-V curve of QD. By considering the linear response of our system to an incoming classical light, we see that depending on the parametric regime, the system could have weak or strong light absorption or may even show lasing. This lasing occurs at high enough bias voltages and is explained by a population inversion considering side bands, while the total electron population in the higher level is less than the lower one. The frequency at which we have the most significant lasing depends on the level spacing and phonon frequency and not on the electron-phonon coupling strength.

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