Chirped pulsed field initiated excitation dynamics in impurity doped quantum dot under the influence of noise
Department of Chemistry, Physical Chemistry Section, Visva-Bharati University, 731235, Santiniketan, Birbhum, West Bengal, India
2 Eklavya Model Residential School, 713148, Kanksa, West Burdwan, West Bengal, India
3 Department of Chemistry, Abhedananda Mahavidyalaya, 731234, Sainthia, Birbhum, West Bengal, India
Accepted: 16 October 2022
Published online: 22 October 2022
Current enquiry meticulously analyses the role of Gaussian white noise (GWN) and external chirped pulsed field (CPF) on the time-average excitation rate (TAER) of impurity doped quantum dot (QD). The CPF brings about the transfer of the ground state electronic population to the excited states during the time-propagation. GWN couples with the system additively and multiplicatively. The study examines the role of various physical parameters, introduction of noise including its pathway and the features of the CPF (amplitude, phase, number of pulses and the chirping parameters) in fabricating the TAER profiles. The TAER profiles are enriched with physical attributes like monotonic rise, monotonic fall, maximization (relevant to achieving large nonlinear optical response), minimization and saturation (the dynamic freezing). Occurrence of above phenomenon depends on the overlap between the various eigenstates, which, in turn, is governed by the effective confinement potential (ECP) of the system. An analytical calculation reveals that the features of the TAER profiles are being guided by the pattern of the net average energy delivered by the CPF to the system over the entire time-propagation.
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