Universality of charge doping driven metal-insulator transition in Sr2RhO4 and role of spin-orbit coupling
Journal article, 2022
We performed angle-resolved photoemission spectroscopy (ARPES) experiments on an electron-doped Sr2RhO4 system Sr2-xCexRhO4 in order to investigate the electron doping-induced metal-insulator transition (MIT). We establish the universality of MIT in electron-doped Sr2RhO4 by comparing results from Sr2-xLaxRhO4 and Sr2-xCexRhO4. Via a systematic analysis of doping-dependent transport and ARPES data, we show that the correlation driven MIT with a noninteger electron number in electron-doped Sr2RhO4 is universal and thus independent of the dopant. Within the universality, the ARPES analysis shows that the band topology determined by the spin-orbit coupling (SOC) is likely a control parameter of the insulating gap size and critical electron number of the MIT. We present a phase diagram of the insulating phase as a function of the effective SOC and electron number.
Author
Junyoung Kwon
Seoul National University
Korea Basic Science Institute
Shoresh Soltani
MAX IV Laboratory
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics
C. M. Polley
MAX IV Laboratory
Jongkeun Jung
Korea Basic Science Institute
Seoul National University
Minsoo Kim
Korea Basic Science Institute
Seoul National University
Donghan Kim
Seoul National University
Korea Basic Science Institute
Jonathan Denlinger
Advanced Light Source, Berkeley
Dongjoon Song
Korea Basic Science Institute
Yoshiyuki Yoshida
National Institute of Advanced Industrial Science and Technology (AIST)
Wonshik Kyung
Korea Basic Science Institute
Changyoung Kim
Korea Basic Science Institute
Seoul National University
Physical Review B
24699950 (ISSN) 24699969 (eISSN)
Vol. 106 24 L241114Subject Categories
Atom and Molecular Physics and Optics
Other Physics Topics
Condensed Matter Physics
DOI
10.1103/PhysRevB.106.L241114