Abstract
We report the formation and observation of an electron liquid in , the quasi-two-dimensional counterpart of , through reactive molecular-beam epitaxy and in situ angle-resolved photoemission spectroscopy. The lowest lying states are found to be comprised of Ti orbitals, analogous to the interface and exhibit unusually broad features characterized by quantized energy levels and a reduced Luttinger volume. Using model calculations, we explain these characteristics through an interplay of disorder and electron-phonon coupling acting cooperatively at similar energy scales, which provides a possible mechanism for explaining the low free carrier concentrations observed at various oxide heterostructures such as the interface.
- Received 20 October 2014
DOI:https://doi.org/10.1103/PhysRevLett.115.096405
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