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Density matrix renormalization group study of a three-orbital Hubbard model with spin-orbit coupling in one dimension

Journal Article · · Physical Review B

Using the density matrix renormalization group technique we study the effect of spin-orbit coupling on a three-orbital Hubbard model in the (t2g)4 sector and in one dimension. Fixing the Hund coupling to a robust value compatible with some multiorbital materials, we present the phase diagram varying the Hubbard U and spin-orbit coupling λ, at zero temperature. Our results are shown to be qualitatively similar to those recently reported using the dynamical mean-field theory in higher dimensions, providing a robust basis to approximate many-body techniques. Among many results, we observe an interesting transition from an orbital-selective Mott phase to an excitonic insulator with increasing λ at intermediate U. In the strong U coupling limit, we find a nonmagnetic insulator with an effective angular momentum <(Jeff)2>≠0 near the excitonic phase, smoothly connected to the <(Jeff)2>=0 regime. In conclusion, we also provide a list of quasi-one-dimensional materials where the physics discussed in this paper could be realized.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1413618
Alternate ID(s):
OSTI ID: 1398741
Journal Information:
Physical Review B, Journal Name: Physical Review B Journal Issue: 15 Vol. 96; ISSN 2469-9950; ISSN PRBMDO
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (3)

Spin dynamics of the block orbital-selective Mott phase journal September 2018
Block excitonic condensate at n = 3.5 in a spin-orbit coupled t 2 g multiorbital Hubbard model journal April 2019
Novel Magnetic Block States in Low-Dimensional Iron-Based Superconductors journal July 2019

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