Separation of transport lifetimes in SrTiO3-based two-dimensional electron liquids

Abstract

Deviations from Landau Fermi liquid behavior are ubiquitous features of the normal state of unconventional superconductors. Despite several decades of investigation, the underlying mechanisms of these properties are still not completely understood. In this work, we show that two-dimensional electron liquids at SrTiO3/RTiO3 (R = Gd or Sm) interfaces reveal strikingly similar physics. Analysis of Hall and resistivity data show a clear separation of transport and Hall scattering rates, also known as "two-lifetime" behavior. This framework gives a remarkably simple and general description of the temperature dependence of the Hall coefficient. Distinct transport lifetimes accurately describe the transport phenomena irrespective of the nature of incipient magnetic ordering, the degree of disorder, confinement, or the emergence of non-Fermi liquid behavior. The Hall scattering rate diverges at a critical quantum well thickness, coinciding with a quantum phase transition. Collectively, these results introduce new constraints on the existing microscopic theories of lifetime separation and point to the need for unified understanding.

arXiv commentVersion accepted for publication in Phys. Rev. B

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Cited by in corpus (12)

• Unusual behavior of cuprates explained by heterogeneous charge localization
• Evidence of a topological Hall effect in Eu${}_{1-x}$Sm${}_x$TiO${}_3$
• Novel metal-insulator-transition at the SrTiO3/SmTiO3 interface
• Carrier density independent scattering rate in SrTiO3-based electron liquids
• Interface-driven ferromagnetism within the quantum wells of a rare earth titanate superlattice
• Electron gas induced in SrTiO${}_3$
• Realization of a "Two Relaxation Rates" in the Hubbard-Falicov-Kimball Model
• Oxide Heterostructures from a Realistic Many-Body Perspective
• Octahedral tilt independent magnetism in confined GdTiO${}_3$ films
• Resolving interfacial charge transfer in titanate superlattices using resonant X-ray reflectometry
• Disorder versus two transport lifetimes in a strongly correlated electron liquid
• Potential Fluctuations at Low Temperatures in Mesoscopic-Scale SmTiO${}_3$/SrTiO${}_3$/SmTiO${}_3$ Quantum Well Structures