Fluctuations superconductivity and giant negative magnetoresistance in a gate voltage tuned 2D electron liquid with strong spin-orbit impurity scattering

Abstract

We present a quantitative theory of the gate-voltage tuned superconductor-to-insulator transition (SIT) observed experimentally in the 2D electron liquid created in the (111) interface between crystalline SrTiO_3 and LaAlO_3 . Considering two fundamental opposing effects of Cooper-pair fluctuations; the critical conductivity enhancement, known as para-conductivity, and its suppression associated with the loss of unpaired electrons due to Cooper-pairs formation, we employ the standard thermal fluctuations theory, modified to include quantum fluctuations within a novel phenomenological approach. Relying on the quantitative agreement found between our theory and a large body of experimental sheet-resistance data, we conclude that spin-orbit scatterings, via significant enhancement of the interaction between fluctuations, strongly enhance the sheet resistance peak at high fields, and reveal anomalous metallic behavior at low fields, due to mixing of relatively heavy electron bands with a light electron band near a Lifshitz point.

arXiv commentsupplemental material included

References in corpus (25)

• Electric Field Control of the LaAlO${}_3$/SrTiO${}_3$ Interface Ground State
• Tunable Rashba spin-orbit interaction at oxide interfaces
• Quantum suppression of superconductivity in ultrathin nanowires
• Nature of the superconductor-insulator transition in disordered superconductors
• A Universal Critical Density Underlying the Physics of Electrons at the LaAlO3/SrTiO3 Interface
• Superconductivity in one dimension
• Role of Spatial Amplitude Fluctuations in Highly Disordered s-Wave Superconductors
• Superconductivity-Related Insulating Behavior
• Anomalous metals -- failed superconductors
• Localized Superconductivity in the Quantum-Critical Region of the Disorder-Driven Superconductor-Insulator Transition in TiN Thin Films
• Single and two-particle energy gaps across the disorder-driven superconductor-insulator transition
• Possible field-tuned SIT in high-Tc superconductors: implications for pairing at high magnetic fields
• Giant negative magnetoresistance driven by spin-orbit coupling at the LAO/STO interface
• Six-fold crystalline anisotropic magnetoresistance in the (111) LaAlO${}_3$/SrTiO${}_3$ oxide interface
• Evidence of quantum phase slip effect in titanium nanowires
• Link between the Superconducting Dome and Spin-Orbit Interaction in the (111) LaAlO${}_3$/SrTiO${}_3$ Interface
• Competition Between Kondo Screening and Magnetism at the LaAlO${}_3$/SrTiO${}_3$ Interface
• Competition between electron pairing and phase coherence in superconducting interfaces
• High field magneto-transport in two-dimensional electron gas LaAlO3/SrTiO3
• Symmetry and correlation effects on band structure explain the anomalous transport properties of (111) LaAlO${}_3$/SrTiO${}_3$
• Magnetoresistance in the superconducting state at the (111) LaAlO${}_3$/SrTiO${}_3$ interface
• Semiclassical theory of anisotropic transport at LaAlO3/SrTiO3 interfaces under in-plane magnetic field
• Quantum phase slip phenomenon in superconducting nanowires with low-Ohmic environment
• Magnetic field tuned superconductor-to-insulator transition at the LaAlO${}_3$ /SrTiO${}_3$ interface
• Vortex excitations in the Insulating State of an Oxide Interface

Cited by in corpus (1)

• Field-Induced Boson Insulating States in a 2D Superconducting Electron Gas with Strong Spin-Orbit Scatterings