Polaronic metal state at the LaAlO3/SrTiO3 interface

C. Cancellieri, A. S. Mishchenko, U. Aschauer, A. Filippetti, C. Faber, O. S. Barišić, V. A. Rogalev, T. Schmitt, N. Nagaosa and V. N. Strocov ()
Additional contact information
C. Cancellieri: Swiss Light Source, Paul Scherrer Institute
A. S. Mishchenko: RIKEN Center for Emergent Matter Science
U. Aschauer: Materials Theory, ETH Zurich
A. Filippetti: CNR-IOM, Istituto Officina dei Materiali, Cittadella Universitaria, Cagliari, Monserrato 09042-I, Italy
C. Faber: Materials Theory, ETH Zurich
O. S. Barišić: Institute of Physics
V. A. Rogalev: Swiss Light Source, Paul Scherrer Institute
T. Schmitt: Swiss Light Source, Paul Scherrer Institute
N. Nagaosa: RIKEN Center for Emergent Matter Science
V. N. Strocov: Swiss Light Source, Paul Scherrer Institute

Nature Communications, 2016, vol. 7, issue 1, 1-8

Abstract: Abstract Interplay of spin, charge, orbital and lattice degrees of freedom in oxide heterostructures results in a plethora of fascinating properties, which can be exploited in new generations of electronic devices with enhanced functionalities. The paradigm example is the interface between the two band insulators LaAlO3 and SrTiO3 that hosts a two-dimensional electron system. Apart from the mobile charge carriers, this system exhibits a range of intriguing properties such as field effect, superconductivity and ferromagnetism, whose fundamental origins are still debated. Here we use soft-X-ray angle-resolved photoelectron spectroscopy to penetrate through the LaAlO3 overlayer and access charge carriers at the buried interface. The experimental spectral function directly identifies the interface charge carriers as large polarons, emerging from coupling of charge and lattice degrees of freedom, and involving two phonons of different energy and thermal activity. This phenomenon fundamentally limits the carrier mobility and explains its puzzling drop at high temperatures.

Date: 2016
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DOI: 10.1038/ncomms10386

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