Pantheon SEMPARIS Le serveur des séminaires parisiens Paris

Status Confirmed
Seminar Series SEM-LPTM-UCP
Subjects cond-mat
Date Tuesday 15 January 2019
Time 14:00
Institute LPTM
Seminar Room 4.13 St Martin II
Speaker's Last Name Rastelli
Speaker's First Name Gianluca
Speaker's Email Address
Speaker's Institution Universität Konstanz, Fachbereich Physik, Konstanz, Allemagne
Title Electron-vibration and electron-photon interaction in nanoscale hybrid systems
Abstract Engineered nanoscale systems, as nanomechanical resonators or microwave photon cavities coupled to mescoscopic conductors, have emerged as a versatile platform for fundamental science and applications. Their tailored properties offer paradigms for nonlinear dynamical couplings in the quantum regime, facilitating the unraveling of new phenomena. For example, these systems open the avenue to engineered quantum light sources, which can be tuned purely by applied voltages. Similarly, they provide a way to access the quantum regime of large mechanical systems containing many billions of individual atoms. To achieve the latter goal, a crucial requirement is cooling the mechanical resonator, integrated in an electrical circuit, to very low temperature. I will present a theoretical study about the nonequilibrium states of nanomechanical resonators or microwave cavities coupled to quantum dots. One of the main results is that ground state cooling of the mechanical resonator can be realistically achieved using spin-polarised current [1,2] or superconducting contacts [3,4]. Furthermore, I will show that a spin-polarized current passing through a quantum dot can efficiently excite a photon cavity and it encodes a special single-atom laser that is characterized by the emergence of complex switching dynamics between multiple limit-cycles [5]. For the different proposals and in various regimes, I will discuss how the nonequilibrium states of the resonator can be readily detected by direct measurements of the dc current.
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