Dynamical response and confinement of the electrons at the LaAlO3/SrTiO3 interface

Abstract

With infrared ellipsometry and transport measurements we investigated the electrons at the interface between LaAlO3 and SrTiO3. We obtained a sheet carrier density of Ns~5-9x 10E13 cm^-2, an effective mass of m*~3m_e, and a strongly frequency dependent mobility. The latter are similar as in bulk SrTi1-xNbxO3 and therefore suggestive of polaronic correlations of the confined carriers. We also determined the vertical density profile which has a strongly asymmetric shape with a rapid initial decay over the first 2 nm and a pronounced tail that extends to about 11 nm.

4 pages, 3 figures, 1 EPAPS file (3 figures)

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• Localization of Two-dimensional Electron Gas in LaAlO3/SrTiO3 Heterostructures
• Tuning up or down the critical thickness in LaAlO3/SrTiO3 through in situ deposition of metal overlayers
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• Large band offset as driving force of 2-dimensional electron confinement: the case of SrTiO${}_3$/SrZrO${}_3$ interface
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• High sensitivity variable-temperature infrared nanoscopy of conducting oxide interfaces
• Large Negative Electronic Compressibility of LaAlO3-SrTiO3 Interfaces with Ultrathin LaAlO3 Layers
• Evolution of the SrTiO${}_3$ surface electronic state as a function of LaAlO${}_3$ overlayer thickness
• Anomalous response to gate voltage application in mesoscopic LaAlO_3/SrTiO_3 devices
• Infrared ellipsometry study of the confined electrons in a high-mobility $\gamma$-Al${}_2$O${}_3$/SrTiO${}_3$ heterostructure
• Thermal and electrostatic tuning of surface phonon-polaritons in LaAlO3/SrTiO3 heterostructures
• Self-consistent iteration procedure in analyzing reflectivity and spectroscopic ellipsometry data of multilayered materials and their interfaces
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• Temperature-Dependent Band Structure of SrTiO${}_3$ Interfaces
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• Anisotropy of the infrared-active phonon modes in the mono-domain state of tetragonal SrTiO3 (110)
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• Direct observation of two-dimensional small polarons at correlated oxide interface
• Ground state features and spectral properties of large polaron liquids from low to high charge densities
• Two-dimensional electron gas in a metal/amorphous oxide interface with spin orbit interaction
• Modified transverse Ising model for the dielectric properties of SrTiO${}_3$ films and interfaces
• Anomalous Thermodynamic Properties of Electron Accumulation Layer in SrTiO${}_3$
• Anisotropic magnetotransport in LaAlO${}_3$/SrTiO${}_3$ nanostructures
• THz carrier dynamics in $SrTi{O}_3/LaTi{O}_3$ interface two-dimensional electron gases