Spin-orbit-coupled ferroelectric superconductivity

Motivated by recent studies on ferroelectriclike order coexisting with metallicity, we investigate ferroelectric (FE) superconductivity in which a FE-like structural phase transition occurs in the superconducting state. We consider a two-dimensional s-wave superconductor with Rashba-type antisymmetr...

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Bibliographic Details
Published in:Physical review. B 2018-07, Vol.98 (2), p.024521, Article 024521
Main Authors: Kanasugi, Shota, Yanase, Youichi
Format: Article
Language:English
Subjects:
Carrier density
Coupling (molecular)
Displacements (lattice)
Electric polarization
Ferroelectric materials
Ferroelectricity
Magnetic fields
Metallicity
Phase transitions
Spin-orbit interactions
Strontium titanates
Superconductivity
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Summary:Motivated by recent studies on ferroelectriclike order coexisting with metallicity, we investigate ferroelectric (FE) superconductivity in which a FE-like structural phase transition occurs in the superconducting state. We consider a two-dimensional s-wave superconductor with Rashba-type antisymmetric spin-orbit coupling (ASOC). Assuming a linear relationship between the polar lattice displacement and the strength of the ASOC, we treat the Rashba-type ASOC as a molecular field of FE-like order. It is shown that the FE-like order is induced by the magnetic field when the system is superconducting. Furthermore, we clarify the FE superconductivity in a low carrier density regime, which was recently discovered in doped SrTiO3. It is demonstrated that the FE superconducting state can be stable in this regime in the absence of the magnetic field. Our results open a way to control the electric polarization by superconductivity, that is, superconducting multiferroics.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.98.024521