Nature of the current-induced insulator-to-metal transition in Ca$_2$RuO$_4$ as revealed by transport-ARPES
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arXiv
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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866910624540262400 |
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| author | Suen, Cissy T Marković, Igor Zonno, Marta Heinsdorf, Niclas Zhdanovich, Sergey Jo, Na-Hyun Schmid, Michael Hansmann, Philipp Puphal, Pascal Fürsich, Katrin Zimmerman, Valentin Smit, Steef Au-Yeung, Christine Zwartsenberg, Berend Krautloher, Maximilian Elfimov, Ilya S Koch, Roland Gorovikov, Sergey Jozwiak, Chris Bostwick, Aaron Franz, Marcel Rotenberg, Eli Keimer, Bernhard Damascelli, Andrea |
| author_facet | Suen, Cissy T Marković, Igor Zonno, Marta Heinsdorf, Niclas Zhdanovich, Sergey Jo, Na-Hyun Schmid, Michael Hansmann, Philipp Puphal, Pascal Fürsich, Katrin Zimmerman, Valentin Smit, Steef Au-Yeung, Christine Zwartsenberg, Berend Krautloher, Maximilian Elfimov, Ilya S Koch, Roland Gorovikov, Sergey Jozwiak, Chris Bostwick, Aaron Franz, Marcel Rotenberg, Eli Keimer, Bernhard Damascelli, Andrea |
| contents | The Mott insulator Ca$_2$RuO$_4$ exhibits a rare insulator-to-metal transition (IMT) induced by DC current. While structural changes associated with this transition have been tracked by neutron diffraction, Raman scattering, and x-ray spectroscopy, work on elucidating the response of the electronic degrees of freedom is still in progress. Here we unveil the current-induced modifications of the electronic states of Ca$_2$RuO$_4$ by employing angle-resolved photoemission spectroscopy (ARPES) in conjunction with four-probe transport. Two main effects emerge: a clear reduction of the Mott gap and a modification in the dispersion of the Ru-bands. The changes in dispersion occur exclusively along the $XM$ high-symmetry direction, parallel to the $b$-axis where the greatest in-plane lattice change occurs. These experimental observations, together with dynamical mean-field theory (DMFT) calculations simulated from the current-induced structural distortions, indicate the intimate interplay of lattice and orbital-dependent electronic response in the current-driven IMT. Furthermore, based on a free energy analysis, we demonstrate that the current-induced phase, albeit thermodynamically equivalent, is electronically distinct from the high-temperature zero-current metallic phase. Our results provide insight into the elusive nature of the current-induced IMT of Ca$_2$RuO$_4$ and advance the challenging, yet powerful, technique of transport-ARPES. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2308_05803 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Nature of the current-induced insulator-to-metal transition in Ca$_2$RuO$_4$ as revealed by transport-ARPES Suen, Cissy T Marković, Igor Zonno, Marta Heinsdorf, Niclas Zhdanovich, Sergey Jo, Na-Hyun Schmid, Michael Hansmann, Philipp Puphal, Pascal Fürsich, Katrin Zimmerman, Valentin Smit, Steef Au-Yeung, Christine Zwartsenberg, Berend Krautloher, Maximilian Elfimov, Ilya S Koch, Roland Gorovikov, Sergey Jozwiak, Chris Bostwick, Aaron Franz, Marcel Rotenberg, Eli Keimer, Bernhard Damascelli, Andrea Strongly Correlated Electrons The Mott insulator Ca$_2$RuO$_4$ exhibits a rare insulator-to-metal transition (IMT) induced by DC current. While structural changes associated with this transition have been tracked by neutron diffraction, Raman scattering, and x-ray spectroscopy, work on elucidating the response of the electronic degrees of freedom is still in progress. Here we unveil the current-induced modifications of the electronic states of Ca$_2$RuO$_4$ by employing angle-resolved photoemission spectroscopy (ARPES) in conjunction with four-probe transport. Two main effects emerge: a clear reduction of the Mott gap and a modification in the dispersion of the Ru-bands. The changes in dispersion occur exclusively along the $XM$ high-symmetry direction, parallel to the $b$-axis where the greatest in-plane lattice change occurs. These experimental observations, together with dynamical mean-field theory (DMFT) calculations simulated from the current-induced structural distortions, indicate the intimate interplay of lattice and orbital-dependent electronic response in the current-driven IMT. Furthermore, based on a free energy analysis, we demonstrate that the current-induced phase, albeit thermodynamically equivalent, is electronically distinct from the high-temperature zero-current metallic phase. Our results provide insight into the elusive nature of the current-induced IMT of Ca$_2$RuO$_4$ and advance the challenging, yet powerful, technique of transport-ARPES. |
| title | Nature of the current-induced insulator-to-metal transition in Ca$_2$RuO$_4$ as revealed by transport-ARPES |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2308.05803 |