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

Guenevere E. D. K. Prawiroatmodjo, Martin Leijnse, Felix Trier, Yunzhong Chen, Dennis V. Christensen, Merlin Soosten, Nini Pryds and Thomas S. Jespersen ()
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Guenevere E. D. K. Prawiroatmodjo: University of Copenhagen
Martin Leijnse: University of Copenhagen
Felix Trier: University of Copenhagen
Yunzhong Chen: Technical University of Denmark
Dennis V. Christensen: Technical University of Denmark
Merlin Soosten: University of Copenhagen
Nini Pryds: Technical University of Denmark
Thomas S. Jespersen: University of Copenhagen

Nature Communications, 2017, vol. 8, issue 1, 1-7

Abstract: 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 gap corresponding to the Zeeman energy of the magnetic pair-breaking field. In contrast, for strong coupling, low-bias conductance is enhanced with a characteristic dependence on temperature, magnetic field and chemical potential consistent with the charge Kondo effect.

Date: 2017
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DOI: 10.1038/s41467-017-00495-7

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