Tratamento de sistemas abertos via reservatórios térmicos bosônico e fermiônico
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2019-04-15
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Universidade Federal de Goiás
Resumo
We developed this work at the moment with the objective to resolver the master equation
for both thermal reservoir: bosonic and fermionic, as well as the master equation in reservoirs
of vacuum and of Fock compressed . the bosonic thermal reservoir is modeled by a collection
of coupled harmonic oscillators and the fermionic reservoir by a collection of two-level atoms.
We made use of the Jaynes-Cummings model and the Bohr, Bohr-Markov and Markov
approaches. In the end we discussed the application to the master equation for two distinct
phenomena, Cooling by Heating (CBH) analyzing average energy graphs to the atomic system
versus number of photons, and the average energy of the bosonic system as a function of the
mean number of phonons, we observed the negative temperature in the absolute scale due to
the inversion of population of states in function of cooperativity, we also analyzed a signature
of negative response in a three level system interacting in a optical cavity, that comes as a
result of decrease in the output field intensity when the input field intensity is increased.
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ARAÚJO, D. I. E. Tratamento de sistemas abertos via reservatórios térmicos bosônico e fermiônico. 2019. 84 f. Dissertação (Mestrado em Física) - Universidade Federal de Goiás, Goiânia, 2019.