Journal Club do Departamento de Física dos Materiais e Mecânica
Nesta semana o pós-doutorando Dr. Jader Pereira dos Santos, da Universidade Federal do ABC, apresentará o artigo "A single-atom heat engine".
Data: 04 de outubro de 2017 (quarta-feira)
Horário: às 12h10min
Local: Sala de Seminários José Roberto Leite - Edifício Alessandro Volta (bloco C)
Abstract:
Heat engines convert thermal energy into mechanical work and generally involve a large number of particles. We report the experimental realization of a single-atom heat engine. An ion is confined in a linear Paul trap with tapered geometry and driven thermally by coupling it alternately to hot and cold reservoirs. The output power of the engine is used to drive a harmonic oscillation. From direct measurements of the ion dynamics, we were able to determine the thermodynamic cycles for various temperature differences of the reservoirs. We then used these cycles to evaluate the power P and efficiency h of the engine, obtaining values up to P = 3.4 × 1022 joules per second and h = 0.28%, consistent with analytical estimations. Our results demonstrate that thermal machines can be reduced to the limit of single atoms.
link: DOI: 10.1126/science.aad6320
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Secretaria do Departamento de Física dos
Materiais e Mecânica - DFMT
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