Kovacs Memory Effect with an Optically Levitated Nanoparticle
Metadatos
Mostrar el registro completo del ítemEditorial
American Physical Society
Fecha
2021-09-24Referencia bibliográfica
Militaru, A... [et al.]. Kovacs Memory Effect with an Optically Levitated Nanoparticle. PHYSICAL REVIEW LETTERS 127, 130603 (2021). [https://doi.org/10.1103/PhysRevLett.127.130603]
Patrocinador
European Union's Horizon 2020 Research and Innovation Programme 863132; Swiss National Science Foundation (SNSF); European Commission 200021L-169319; FEDER/Ministerio de Ciencia, Innovacion y Universidades-Agencia Estatal de Investigacion MTM2017-84446-C2-2-R PID2020-116567GB-C22 PID2020-112796RB-C22; Madrid Government (Comunidad de Madrid-Spain) under the Multiannual Agreement with UC3M EPUC3M23; FEDER/Junta de Andalucia-Consejeria de Economia y Conocimiento C-FQM-410UGR18 P18-FR-3583Resumen
The understanding of the dynamics of nonequilibrium cooling and heating processes at the nanoscale is
still an open problem. These processes can follow surprising relaxation paths due to, e.g., memory effects,
which significantly alter the expected equilibration routes. The Kovacs effect can take place when a
thermalization process is suddenly interrupted by a change of the bath temperature, leading to a
nonmonotonic evolution of the energy of the system. Here, we demonstrate that the Kovacs effect can
be observed in the thermalization of the center of mass motion of a levitated nanoparticle. The temperature
is controlled during the experiment through an external source of white Gaussian noise that mimics an
effective thermal bath at a temperature that can be changed faster than any relaxation time of the system.We
describe our experiments in terms of the dynamics of a Brownian particle in a harmonic trap without any
fitting parameter, suggesting that the Kovacs effect can appear in a large variety of systems.