Controlling a Van Hove singularity and Fermi surface topology at a complex oxide heterostructure interface

Mori, Ryo; Marshall, Patrick B.; Ahadi, Kaveh; Denlinger, Jonathan D.; Stemmer, Susanne; Lanzara, Alessandra

doi:10.1038/s41467-019-13046-z

Title: Controlling a Van Hove singularity and Fermi surface topology at a complex oxide heterostructure interface

Journal Article · 04 December 2019 · Nature Communications

DOI: https://doi.org/10.1038/s41467-019-13046-z · OSTI ID:1619601

^[1]; Marshall, Patrick B. ^[2]; Ahadi, Kaveh ^[2]; Denlinger, Jonathan D. ^[3]; Stemmer, Susanne ^[2]; Lanzara, Alessandra ^[4]

Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
Univ. of California, Santa Barbara, CA (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

The emergence of saddle-point Van Hove singularities (VHSs) in the density of states, accompanied by a change in Fermi surface topology, Lifshitz transition, constitutes an ideal ground for the emergence of different electronic phenomena, such as superconductivity, pseudo-gap, magnetism, and density waves. However, in most materials the Fermi level, E_F, is too far from the VHS where the change of electronic topology takes place, making it difficult to reach with standard chemical doping or gating techniques. Here, we demonstrate that this scenario can be realized at the interface between a Mott insulator and a band insulator as a result of quantum confinement and correlation enhancement, and easily tuned by fine control of layer thickness and orbital occupancy. These results provide a tunable pathway for Fermi surface topology and VHS engineering of electronic phases.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; Gordon and Betty Moore Foundation (GBMF); National Science Foundation (NSF); Funai Foundation for Information Technology; USDOE

Grant/Contract Number:: AC02-05CH11231; GBMF4859; 1740213; AC02-05-CH11231

OSTI ID:: 1619601

Alternate ID(s):: OSTI ID: 1581087

Journal Information:: Nature Communications, Vol. 10, Issue 1; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 8 works

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Separation of transport lifetimes in SrTiO3-based two-dimensional electron liquids Mikheev, Evgeny; Freeze, Christopher R.; Isaac, Brandon J. arXiv https://doi.org/10.48550/arxiv.1503.04484	text	January 2015
Polaronic metal state at the LaAlO3/SrTiO3 interface Cancellieri, C.; Mishchenko, A. S.; Aschauer, U. arXiv https://doi.org/10.48550/arxiv.1507.04723	text	January 2015
Carrier density independent scattering rate in SrTiO3-based electron liquids Mikheev, Evgeny; Raghavan, Santosh; Zhang, Jack Y. arXiv https://doi.org/10.48550/arxiv.1512.02294	text	January 2015

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