Transport and excitations in a negative-U quantum dot at the LaAlO₃/SrTiO₃ interface.

ABSTRACT: In a solid-state host, attractive electron-electron interactions can lead to the formation of local electron pairs which play an important role in the understanding of prominent phenomena such as high T _c superconductivity and the pseudogap phase. Recently, evidence of a paired ground state without superconductivity was demonstrated at the level of single electrons in quantum dots at the interface of LaAlO₃ and SrTiO₃. Here, we present a detailed study of the excitation spectrum and transport processes of a gate-defined LaAlO₃/SrTiO₃ quantum dot exhibiting pairing at low temperatures. For weak tunneling, the spectrum agrees with calculations based on the Anderson model with a negative effective charging energy U, and exhibits an energy

SUBMITTER: Prawiroatmodjo GEDK 

PROVIDER: S-EPMC5577219 | biostudies-literature | 2017 Aug

REPOSITORIES: biostudies-literature