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Correlation-Induced Band Competition in SrTiO3/LaAlO3

Published online by Cambridge University Press:  23 January 2017

Eran Maniv ,
Yoram Dagan  and
Moshe Goldstein
Eran Maniv*
Affiliation:
Raymond and Beverly Sackler School of Physics and Astronomy, Tel Aviv 6997801, Israel
Yoram Dagan
Affiliation:
Raymond and Beverly Sackler School of Physics and Astronomy, Tel Aviv 6997801, Israel
Moshe Goldstein
Affiliation:
Raymond and Beverly Sackler School of Physics and Astronomy, Tel Aviv 6997801, Israel
*
*(Email: eranmaniv@gmail.com)

Abstract

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The oxide interface SrTiO3/LaAlO3 supports a 2D electron liquid displaying superconductivity and magnetism, while allowing for a continuous control of the electron density using a gate. Our recent measurements have shown a similar surprising nonmonotonic behavior as function of the gate voltage (carrier density) of three quantities: the superconducting critical temperature and field, the inverse Hall coefficient, and the frequency of quantum oscillations. While the total density has to be monotonic as function of gate, the last result indicates that one of the involved bands has a nonmontonic occupancy as function of the chemical potential. We show how electronic interactions can lead to such an effect, by creating a competition between the involved bands and making their sturcture non-rigid, and thus account for all these effects. Adding Fock terms to our previous Hartree treatment makes this scenario even more generic.

Keywords

electronic structuremagnetoresistance (transport)superconducting
Type
Articles
Information
MRS Advances , Volume 2 , Issue 23: Electronics, Magnetics and Photonics , 2017 , pp. 1243 - 1248
Copyright
Copyright © Materials Research Society 2017 

References

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