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Slope-reversed Mott transition in multiorbital systems

Title
Slope-reversed Mott transition in multiorbital systems
Authors
KimA.J.ChoiM.JeonG.S.
Ewha Authors
전건상
SCOPUS Author ID
전건상scopus
Issue Date
2015
Journal Title
Physical Review B - Condensed Matter and Materials Physics
ISSN
1098-0121JCR Link
Citation
vol. 92, no. 12
Publisher
American Physical Society
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
We examine finite-temperature phase transitions in the two-orbital Hubbard model with different bandwidths by means of the dynamical mean-field theory combined with the continuous-time quantum Monte Carlo method. It is found that there emerges a peculiar slope-reversed first-order Mott transition between the orbital-selective Mott phase and the Mott insulator phase in the presence of Ising-type Hund's coupling. The origin of the slope-reversed phase transition is clarified by the analysis of the temperature dependence of the energy density. It turns out that the increase of Hund's coupling lowers the critical temperature of the slope-reversed Mott transition. Beyond a certain critical value of Hund's coupling the first-order transition turns into a finite-temperature crossover. We also reveal that the orbital-selective Mott phase exhibits frozen local moments in the wide orbital, which is demonstrated by the spin-spin correlation functions. © 2015 American Physical Society.
DOI
10.1103/PhysRevB.92.125127
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자연과학대학 > 물리학전공 > Journal papers
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