ARPES studies in LaTiO3/SrTiO3 heterostructures

ORAL

Abstract

Electronic band structure of LaTiO3/SrTiO3 heterostructures was studied using angle resolved photoemission spectroscopy (ARPES). LaTiO3 films, grown by in situ pulsed laser deposition (PLD) on beamline 7.0.1 at Advanced Light Source, exhibit a thickness-dependent phase transition from the correlated metallic interface to Mott insulator. We observed the quasi-particle peak at the Fermi level explaining the metallic interface for ultrathin LaTiO3, and the band gap opened for thick LaTiO3 similar to the bulk. We compare the thickness dependent electronic structure with theoretically calculated phase diagram (S. Okamoto and A. J. Millis, Nature 428, 630 (2004)).

*Work supported by U.S. DOE (DE-AC02-05CH11231 for ALS), the Max Planck Society, and Swiss National Science Foundation (PBELP2-125484).

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Authors

  • Young Jun Chang

    • Advanced Light Source and Fritz-Haber-Institut

  • Luca Moreschini

    • ALS
    • Advanced Light Source

  • Yong Su Kim

    • ALS and Hanyang University

  • A. Walter

    • ALS and Fritz-Haber-Institut
    • FHI, Max-Planck-Gesellschaft and ALS, E. O. Lawrence Berkeley Laboratory

  • Davide Innocenti

    • Advanced Light Source and University of Rome ``Tor Vergata''
    • ALS and University of Rome ``Tor Vergata''

  • Aaron Bostwick

    • Lawrence Berkeley National Laboratory
    • ALS

  • Geoffrey A. Gaines

    • ALS

  • Karsten Horn

    • Fritz-Haber-Institut

  • Eli Rotenberg

    • ALS
    • LBL Berkeley
    • Lawrence Berkeley National Laboratory