تقرير
Nature of the current-induced insulator-to-metal transition in Ca$_2$RuO$_4$ as revealed by transport-ARPES
| العنوان: | Nature of the current-induced insulator-to-metal transition in Ca$_2$RuO$_4$ as revealed by transport-ARPES |
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| المؤلفون: | 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 |
| سنة النشر: | 2023 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Strongly Correlated Electrons |
| الوصف: | 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. Comment: 10 pages, 5 figures |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/2308.05803 |
| رقم الأكسشن: | edsarx.2308.05803 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |