Quasi-Two-Dimensional Anomalous Hall Mott Insulator of Topologically Engineered J eff = 1 / 2 Electrons

Yang, Junyi; Suwa, Hidemaro; Meyers, Derek; Zhang, Han; Horak, Lukas; Wang, Zhaosheng; Fabbris, Gilberto; Choi, Yongseong; Karapetrova, Jenia; Kim, Jong-Woo; Haskel, Daniel; Ryan, Philip J.; Dean, M. P. M.; Hao, Lin; Liu, Jian

doi:10.1103/PhysRevX.12.031015

Title: Quasi-Two-Dimensional Anomalous Hall Mott Insulator of Topologically Engineered $J_{eff} = 1 / 2$ Electrons

Journal Article · Fri Jul 22 00:00:00 EDT 2022 · Physical Review. X

DOI:https://doi.org/10.1103/PhysRevX.12.031015· OSTI ID:1877443

Yang, Junyi;

; Meyers, Derek; Zhang, Han;

; Wang, Zhaosheng;

;

; Karapetrova, Jenia;

; Haskel, Daniel;

;

We investigate an experimental toy-model system of a pseudospin-half square-lattice Hubbard Hamiltonian in [(SrIrO₃)₁/(CaTiO₃)₁] to include both nontrivial complex hopping and moderate electronic correlation. While the former induces electronic Berry phases as anticipated from the weak-coupling limit, the later stabilizes an antiferromagnetic (AFM) Mott insulator ground state in analogous to the strong-coupling limit. Their combined results in the real system are found to be an anomalous Hall effect with a non-monotonic temperature dependence due to the self-competition of the electron-hole pairing in the Mott state, and an exceptionally large Ising anisotropy that is captured as a giant magnon gap beyond the superexchange approach. The unusual phenomena highlight the rich interplay of electronic topology and electronic correlation in the intermediate-coupling regime that is largely unexplored and challenging in theoretical modelling.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States); Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); US Department of the Navy, Office of Naval Research (ONR); JSPS KAKENHI; National Natural Science Foundation of China (NSFC); High Magnetic Field Laboratory of Anhui Province

Grant/Contract Number:: SC0012704; AC02-06CH11357; DMR-1848269; N00014-20-1-2809; JP19K14650; JP22K03508; 12104460; AHHM-FX-2021-03

OSTI ID:: 1877443

Alternate ID(s):: OSTI ID: 1881978; OSTI ID: 1909697

Report Number(s):: BNL-223256-2022-JAAM; PRXHAE; 031015

Journal Information:: Physical Review. X, Journal Name: Physical Review. X Vol. 12 Journal Issue: 3; ISSN 2160-3308

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Quasi-Two-Dimensional Anomalous Hall Mott Insulator of Topologically Engineered J eff = 1 / 2 Electrons

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Title: Quasi-Two-Dimensional Anomalous Hall Mott Insulator of Topologically Engineered $J_{eff} = 1 / 2$ Electrons