Intersubband pairing induced Fulde-Ferrell phase in metallic nanofilms

Abstract

We consider a free-standing metallic nanofilm with a predominant intersubband paring which emerges as a result of the confinement in the growth direction. We show that the Fermi wave vector mismatch between the subbands, detrimental to the intersubband pairing, can be compensated by the non-zero center of mass momentum of the Cooper pairs. This leads to the spontaneous appearance of the intersubband Fulde-Ferrell (IFF) state, even in the absence of an external magnetic field. Our study of the intrasubband pairing channel on the stability of the IFF phase shows that the former strongly competes with the intersubband pairing, which prohibits the coexistence of the two superconducting phases. Interestingly, upon application of the magnetic field we find a transition to an exotic mixed spin-singlet subband-triplet and spin-triplet subband-singlet paired state. Finally, we discuss the possibility of existence of the IFF pairing in novel superconducting materials.

arXiv comment8 pages, 5 figures

References in corpus (37)

• Proximity effects in superconductor-ferromagnet heterostructures
• Unconventional pairing originating from disconnected Fermi surfaces in superconducting LaFeAsO${}_{1-x}$F${}_x$}
• LaFeAsO${}_{1-x}$F${}_x$: A low carrier density superconductor near itinerant magnetism
• Fulde-Ferrell-Larkin-Ovchinnikov Superconducting State in CeCoIn5
• Evidence for two superconducting energy gaps in MgB2 by point-contact spectroscopy
• Fulde-Ferrell-Larkin-Ovchinnikov State in Heavy Fermion Superconductors
• Two Gap State Density in MgB${}_2$: A True Bulk Property or A Proximity Effect?
• A Universal Critical Density Underlying the Physics of Electrons at the LaAlO3/SrTiO3 Interface
• Evidence for Two Superconducting Gaps in $Mg{B}_2$
• Hard Superconductivity of a Soft Metal in the Quantum Regime
• Macroscopic Superconducting Current through a Silicon Surface Reconstruction with Indium Adatoms: Si(111)-(R7$\times$R3)-In
• Evidence of Andreev bound states as a hallmark of the FFLO phase in $\kappa$-(BEDT-TTF)${}_2$Cu(NCS)${}_2$
• Observation of the Fulde-Ferrell-Larkin-Ovchinnikov state in the quasi-two-dimensional organic superconductor $\kappa$-(BEDT-TTF)${}_2$Cu(NCS)${}_2$
• Fulde-Ferrell-Larkin-Ovchinnikov state in a perpendicular field of quasi two-dimensional CeCoIn5
• Magnetic field - temperature phase diagram of quasi-two-dimensional organic superconductor lambda-(BETS)_2 GaCl_4 studied via thermal conductivity
• Even Parity, Orbital Singlet and Spin Triplet Pairing for Superconducting $La(O_{1-x}{F}_x)FeAs$
• Topological superconductivity and unconventional pairing in oxide interfaces
• Two-dimensional superconducting state of monolayer Pb films grown on GaAs(110) in a strong parallel magnetic field
• Quantum size effects on the perpendicular upper critical field in ultra-thin lead films
• Microscopic study of the Fulde-Ferrell-Larkin-Ovchinnikov state in an all-organic superconductor
• Finite momentum Cooper pairing in 3D topological insulator Josephson junctions
• Antiferromagnetic fluctuations in the normal state of LiFeAs
• Magnetic field induced lattice anomaly inside the superconducting state of CeCoIn${}_5$: evidence of the proposed Fulde-Ferrell-Larkin-Ovchinnikov state
• On interband pairing in multiorbital systems
• Unconventional multi-band superconductivity in bulk SrTiO${}_3$ and LaAlO${}_3$/SrTiO${}_3$ interfaces
• The Fulde-Ferrell-Larkin-Ovchinnikov state in pnictides
• Magnetic-field induced quantum-size cascades in superconducting nanowires
• In-plane magnetic field anisotropy of the FFLO state in layered superconductors
• Multi-band effects on Fulde-Ferrell-Larkin-Ovchinnikov states of Pauli-limited superconductors
• Rise and fall of shape resonances in thin films of BCS superconductors
• Superconducting transition temperature of Pb nanofilms: Impact of the thickness-dependent oscillations of the phonon mediated electron-electron coupling
• Influence of $s_{\pm }$ symmetry on unconventional superconductivity in pnictides above the Pauli limit -- two-band model study
• Instability of Fulde-Ferrell-Larkin-Ovchinnikov states in three and two dimensions
• Quantum size effect on the paramagnetic critical field in Pb nanofilms
• Influence of the electron density on the thickness-dependent energy gap oscillations in superconducting metallic nanofilms
• Spontaneous appearance of nonzero momentum Cooper pairing: Possible application to the iron-pnictides
• Fulde-Ferrell state in superconducting core/shell nanowires: role of the orbital effect

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