152 citations · 209 across the 4 of their papers we have counts for
4 papers
A quantum Otto-type heat engine with fixed frequency
Richard Q. Matos, Rogerio J. de Assis, Norton G. de Almeida
In this work, we analyze an Otto-type cycle operating with a working substance composed of a quantum harmonic oscillator (QHO). Unlike other studies in which the work extraction is…
Universal two-level quantum Otto machine under a squeezed reservoir
Rogério J. de Assis, José S. Sales, Jefferson A. R. da Cunha +1
We study an Otto heat machine whose working substance is a single two-level system interacting with a cold thermal reservoir and with a squeezed hot thermal reservoir. By adjusting…
Efficiency of a quantum Otto heat engine operating under a reservoir at effective negative temperatures
Rogério J. de Assis, Taysa M. de Mendonça, Celso J. Villas-Boas +4
Abstract We perform an experiment in which a quantum heat engine works under two reservoirs, one at a positive spin temperature and the other at an effective negative spin temperat…
Feasible platform to study negative temperatures
R. J. de Assis, C. J. Villas-Boas, N. G. de Almeida
We afford an experimentally feasible platform to study Boltzmann negative temperatures. Our proposal takes advantage of well-known techniques of engineering Hamiltonian to achieve…