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ARPES Studies of Two-Dimensional Electron Gases at Transition Metal Oxide Surfaces

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Spectroscopy of Complex Oxide Interfaces

Part of the book series: Springer Series in Materials Science ((SSMATERIALS,volume 266))

Abstract

High mobility two-dimensional electron liquids (2DELs) underpin today’s silicon based devices and are of fundamental importance for the emerging field of oxide electronics. Such 2DELs are usually created by engineering band offsets and charge transfer at heterointerfaces. However, in 2011 it was shown that highly itinerant 2DELs can also be induced at bare surfaces of different transition metal oxides where they are far more accessible to high resolution angle resolved photoemission (ARPES) experiments. Here we review work from this nascent field which has led to a systematic understanding of the subband structure arising from quantum confinement of highly anisotropic transition metal d-states along different crystallographic directions. We further discuss the role of different surface preparations and the origin of surface 2DELs, the understanding of which has permitted control over 2DEL carrier densities. Finally, we discuss signatures of strong many-body interactions and how spectroscopic data from surface 2DELs may be related to the transport properties of interface 2DELs in the same host materials.

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Acknowledgements

The authors acknowledge financial support through the University of Geneva and the Swiss National Science Foundation and would like to thank C. Bernhard, R. Claessen, A. Fête, S. Gariglio, K. Held, P. D. C. King, F. Lechermann, L. D. Marks, W. Meevasana, N. C. Plumb, M. Radovic, V. Strocov, A. Tamai, J. M. Triscone, D. van der Marel and Z. Wang for discussions.

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  1. University of Geneva, 24 Quai Ernest-Ansermet, 1211, Geneva, Switzerland

    Siobhan McKeown Walker, Flavio Y. Bruno & Felix Baumberger

  2. Swiss Light Source, Paul Scherrer Institut, 5232, Villigen, Switzerland

    Felix Baumberger

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Correspondence to Siobhan McKeown Walker .

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  1. Empa—Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, Switzerland

    Claudia Cancellieri

  2. Spectroscopy of Novel Materials Group, Paul Scherrer Institute, Villigen, Switzerland

    Vladimir N. Strocov

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McKeown Walker, S., Bruno, F.Y., Baumberger, F. (2018). ARPES Studies of Two-Dimensional Electron Gases at Transition Metal Oxide Surfaces. In: Cancellieri, C., Strocov, V. (eds) Spectroscopy of Complex Oxide Interfaces. Springer Series in Materials Science, vol 266. Springer, Cham. https://doi.org/10.1007/978-3-319-74989-1_4

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