Shape Resonances in superconducting gaps in a 2DEG at oxide-oxide interface

Abstract

In multiband superconductivity, the case where the single electron hopping between different Fermi surface spots of different symmetry is forbidden by selection rules is recently attracting a large interest. The focus is addressed to superconductivity made of multiple condensates with different symmetry where the chemical potential crosses a 2.5 Lifshitz transition. This can now be investigated experimentally by fine-tuning of the chemical potential in the range of tens meV around a band edge using gate voltage control. We discuss here the case of the two-dimensional electron gas (2DEG), at the interface between two insulating oxides confined within a slab of 5 nanometers thickness, where the electronic structure is made of subbands generated by quantum size effects. We focus on the case of the BCS-BEC transition in the upper subband for different pairing strength in the shallow Fermi surface.

10 pages, 6 figures, MBT17 Conference Proceedings, Rostock, Germany, Sept 2013

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Cited by in corpus (21)

• Superconductivity in dilute SrTiO${}_3$: a review
• Superconductivity vs bound state formation in a two-band superconductor with small Fermi energy -- applications to Fe-pnictides/chalcogenides and doped SrTiO3
• Dimensional crossover and incipient quantum size effects in superconducting niobium nanofilms
• Fermi-Bose mixtures and BCS-BEC crossover in high-Tc superconductors
• Modulation of the superconducting critical temperature due to quantum confinement at the LaAlO${}_3$/SrTiO${}_3$ interface
• Rise and fall of shape resonances in thin films of BCS superconductors
• Spin-orbit coupling controlling the superconducting dome of artificial superlattices of quantum wells
• Resonant multigap superconductivity at room temperature near a Lifshitz topological transition in sulfur hydrides
• Multigaps superconductivity at unconventional Lifshitz transition in a 3D Rashba heterostructure at atomic limit
• Classifying induced superconductivity in atomically thin Dirac-cone materials
• High-Tc superconducting dome in artificial heterostructures made of nanoscale quantum building blocks
• Fe-As bond fluctuations in a double-well potential in LaFeAsO
• Multigap superconductivity and interaction driven resonances in superconducting nanofilms with an inner potential barrier
• Impact of disorder on the superconducting transition temperature near a Lifshitz transition
• Multifaceted impact of a surface step on superconductivity in atomically thin films
• Upper critical magnetic field and multiband superconductivity in artificial high-Tc superlattices of nano quantum wells
• Dimensional crossover in ultracold Fermi gases from Functional Renormalisation
• Dynamic properties of superconductors: Anderson-Bogoliubov mode and Berry phase in BCS and BEC regimes
• Phase separation and pairing fluctuations in oxide materials
• Periodicity of superconducting shape resonances in thin films
• Modulation of superconductivity by quantum confinement in doped strontium titanate