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Nonlocal correlations in the orbital selective Mott phase of a one-dimensional multiorbital Hubbard model

Journal Article · · Physical Review B
 [1];  [2];  [1];  [3];  [4];  [4];  [4];  [2];  [1]
  1. The Univ. of Tennessee, Knoxville, TN (United States)
  2. The Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
+ Show Author Affiliations
Here, we study nonlocal correlations in a three-orbital Hubbard model defined on an extended one-dimensional chain using determinant quantum Monte Carlo and density matrix renormalization group methods. We focus on a parameter regime with robust Hund's coupling, which produces an orbital selective Mott phase (OSMP) at intermediate values of the Hubbard U, as well as an orbitally ordered ferromagnetic insulating state at stronger coupling. An examination of the orbital- and spin-correlation functions indicates that the orbital ordering occurs before the onset of magnetic correlations in this parameter regime as a function of temperature. In the OSMP, we find that the self-energy for the itinerant electrons is momentum dependent, indicating a degree of nonlocal correlations while the localized electrons have largely momentum independent self-energies. These nonlocal correlations also produce relative shifts of the holelike and electronlike bands within our model. The overall momentum dependence of these quantities is strongly suppressed in the orbitally ordered insulating phase.
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:
1376329
Alternate ID(s):
OSTI ID: 1335198
Journal Information:
Physical Review B, Journal Name: Physical Review B Journal Issue: 23 Vol. 94; 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 (12)

Spin dynamics of the block orbital-selective Mott phase journal September 2018
Fingerprints of an orbital-selective Mott phase in the block magnetic state of BaFe2Se3 ladders journal June 2019
Orbital-selective Mott phase in multiorbital models for iron pnictides and chalcogenides journal September 2017
Density matrix renormalization group study of a three-orbital Hubbard model with spin-orbit coupling in one dimension journal October 2017
Electronic and spin dynamics in the insulating iron pnictide NaFe 0.5 Cu 0.5 As journal December 2017
Excitonic density waves, biexcitons, and orbital-selective pairing in two-orbital correlated chains journal July 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
Effect of Nonlocal Correlations on the Electronic Structure of LiFeAs journal December 2019
Strong electronic correlations and Fermi surface reconstruction in the quasi-one-dimensional iron superconductor BaFe 2 S 3 journal January 2019
Density matrix renormalization group study of a three-orbital Hubbard model with spin-orbit coupling in one dimension text January 2017
Fingerprints of an Exotic Orbital-Selective Mott Phase in the Block Magnetic State of BaFe$_2$Se$_3$ Ladders text January 2018

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