Electronic cavities in mesoscopic devices
Michael S. Ferguson1, Giorgio Nicolì2, David Oehri1, Clemens Rössler3, Thomas Ihn2, Klaus Ensslin2, Gianni Blatter1, and Oded Zilberberg1
1Institute for Theoretical Physics, ETH Zurich
2Solid State Physics Laboratory, ETH Zurich
3Infineon Technologies, Austria
Spin-coherent transport in all electronic dot—cavity systems has been recently demonstrated experimentally [Phys. Rev. Lett. 115, 166603 (2015)] and explained theoretically [Phys. Rev. B 96, 235431]. We propose technological and fundamental applications for electronic cavities. Technologically they can be used to enhance spectroscopic cotunelling signatures of excited states, which provides information on the structure of quantum dots. On the fundamental side we propose them as a tool to investigate the Kondo-box problem, where the size of the metal encasing an impurity is reduced. This situation is simulated by an electronic cavity setup, where the dot—cavity singlet takes on the role of the Kondo singlet in the limit of vanishing level spacing. These proposals lay the groundwork for electronic cavities as a standard building block in future mesoscopic devices.