Controlling heat and particle currents in nanodevices by quantum observation

Abstract

THERMOELECTRICS: Observe and control The presence of a quantum observer, acting locally in a thermoelectric nanodevice, is shown to be enough to change its heat and electronic transport path. In quantum mechanics the observation of a phenomenon can affect its outcome. Local quantum observation of a system can induce continuous and dynamic changes in its quantum coherence, thus providing another level of control of its properties. Angel Rubio and colleagues study theoretically this idea in a nanodevice whose left and right side are connected to hot and thermal baths, respectively; this configuration forces the energy and particles to flow clockwise. Introduction of a quantum observer however, induces a counter-clockwise particle ring-current due to the localized electronic state and symmetry breaking of the system. Such heat flow control might prove useful for spintronics, quantum phononics, and sensing devices.