The Mott insulator Ca₂RuO₄ exhibits an insulator-to-metal transition induced by d.c. current. This study uses transport-ARPES to probe the electronic structure under current, revealing a clear reduction of the Mott gap and a modification in the Ru band dispersion. A free-energy analysis shows the current-induced phase is distinct from the high-temperature metallic phase, highlighting the interplay between lattice and orbital-dependent electronic responses in the current-driven transition.

C. T. Suen, I. Marković, M. Zonno, N. Heinsdorf, S. Zhdanovich, N. H. Jo, M. Schmid, P. Hansmann, P. Puphal, K. Fürsich, S. Smit, C. Au-Yeung, V. Zimmermann, B. Zwartsenberg, M. Krautloher, I. S. Elfimov, R. Koch, S. Gorovikov, C. Jozwiak, A. Bostwick, M. Franz, Eli Rotenberg, B. Keimer, A. Damascelli