Electronic response of a Mott insulator at a current-induced insulator-to-metal transition

Suen CT, Marković I, Zonno M, Heinsdorf N, Zhdanovich S, Jo NH, Schmid M, Hansmann P, Puphal P, Fürsich K, Smit S, Au-Yeung C, Zimmermann V, Zwartsenberg B, Krautloher M, Elfimov IS, Koch R, Gorovikov S, Jozwiak C, Bostwick A, Franz M, Rotenberg E, Keimer B, Damascelli A (2024)

Publication Type: Journal article

Publication year: 2024

Journal

Nature Physics Nature Research

DOI: 10.1038/s41567-024-02629-3

Abstract

The Mott insulator Ca2RuO4 exhibits an insulator-to-metal transition induced by d.c. current. Despite the thorough examination of the structural changes associated with this transition, a comprehensive knowledge of the response of electronic degrees of freedom is still lacking. Here we demonstrate current-induced modifications of the electronic states of Ca2RuO4. Angle-resolved photoemission spectroscopy in conjunction with four-probe electrical transport (transport-ARPES) measurements reveal a clear reduction of the Mott gap and a modification in the dispersion of the Ru bands. Based on a free-energy analysis, we show that the current-induced phase is electronically distinct from the high-temperature zero-current metallic phase. Our results highlight strong interplay of lattice- and orbital-dependent electronic responses in the current-driven insulator-to-metal transition.

Authors with CRIS profile

Philipp Hansmann Professur für Theoretische Physik mit dem Schwerpunkt Molekulare Materialien

Involved external institutions

Max-Planck-Institut für Festkörperforschung DE Germany (DE) University of British Columbia CA Canada (CA) Canadian Light Source (CLS) / Centre canadien de rayonnement synchrotron (CCRS) CA Canada (CA) Lawrence Berkeley National Laboratory (LBNL) US United States (USA) (US)

How to cite

APA:

Suen, C.T., Marković, I., Zonno, M., Heinsdorf, N., Zhdanovich, S., Jo, N.H.,... Damascelli, A. (2024). Electronic response of a Mott insulator at a current-induced insulator-to-metal transition. Nature Physics. https://doi.org/10.1038/s41567-024-02629-3

MLA:

Suen, C. T., et al. "Electronic response of a Mott insulator at a current-induced insulator-to-metal transition." Nature Physics (2024).

BibTeX: Download