Oettinger, David; Chitra, R.; Restrepo, Juliana (2014-02-12)
Abstract:Controlled heat flow has been a longstanding quest in solid state physics as this is a fundamental requisite for thermotronics. Recently, there has been a lot of interest in nanoscale hybrid systems as possible candidates for thermal devices. In this context, we study the heat current in the simplest hybrid device of a two level system weakly coupled to two heat baths. We use the reduced density matrix approach coupled with a simple Born-Markov approximation to calculate the heat current in the steady state. We consider different kinds of reservoirs and show that the nature of the reservoir plays a very important role in determining the thermal characteristics of the device. In particular, we investigate the effectiveness of a conventional superconductor as a reservoir with regard to manipulating the heat current. In the emergent temperature characteristics, we find that superconductivity in the reservoirs leads to enhanced thermal currents and that the superconducting phase transition is clearly visible in the heat current. We observe negative differential thermal conductance and a pronounced rectification of the heat current making this a good building block for a quantum thermal diode.
Es proyecto?:no
Autor:Oettinger, David
Programa Nal. Colciencias:Programa Nacional de Ciencias Básicas
Insitución cofinanciadora:Departamento Administrativo de Ciencia, Tecnología e Innovación [CO] Colciencias
Institución participante:Universidad de Antioquia, UdeA
Tipo de producto resultado de investigación:info:eu-repo/semantics/other.generacióndecontenidos
Fecha:2014-02-12
Proyecto id:1115-569-34912
Comunidad vinculada:Comunidad científica colombiana