Numerical investigation of spin excitations in a doped spin chain

Pärschke, Ekaterina M.; Wang, Yao; Moritz, Brian; Devereaux, Thomas P.; Chen, Cheng -Chien; Wohlfeld, Krzysztof

doi:10.1103/physrevb.99.205102

Title: Numerical investigation of spin excitations in a doped spin chain

Journal Article · Wed May 01 00:00:00 EDT 2019 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.99.205102· OSTI ID:1526412

Pärschke, Ekaterina M. ^[1]; Wang, Yao ^[2]; Moritz, Brian ^[3]; Devereaux, Thomas P. ^[4]; Chen, Cheng -Chien ^[1]; Wohlfeld, Krzysztof ^[5]

Univ. of Alabama at Birmingham, Birmingham, AL (United States)
Harvard Univ., Cambridge, MA (United States)
Stanford Univ., Menlo Park, CA (United States)
Stanford Univ., Menlo Park, CA (United States); Stanford Univ., Stanford, CA (United States)
Univ. of Warsaw, Warsaw (Poland)

We study the doping evolution of spin excitations in a one-dimensional (1D) Hubbard model and its downfolded spin Hamiltonians, by using exact diagonalization combined with cluster perturbation theory. In all models we observe hardening (softening) of spin excitations upon electron (hole) doping, which are reminiscent of recent experiments on two-dimensional (2D) cuprate materials. We also find that the three-site and even higher-order terms are crucial for the low-energy effective spin models to reproduce the magnetic spectra of doped Hubbard systems at a quantitative level. To interpret the numerical results, we further employ a strong coupling slave-boson mean-field theory. The mean-field theory provides an intuitive understanding of the overall compact support of dynamic spin structure factors, including the shift of zero-energy modes and change of spin excitation bandwidth with doping. In conclusion, our results can serve as predictive benchmarks for future inelastic x-ray or neutron scattering experiments on doped 1D antiferromagnetic Mott insulators.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-76SF00515; AC02-05CH11231; 2016/22/E/ST3/00560; 2016/23/B/ST3/00839

OSTI ID:: 1526412

Alternate ID(s):: OSTI ID: 1510141

Journal Information:: Physical Review. B, Vol. 99, Issue 20; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 9 works

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Title: Numerical investigation of spin excitations in a doped spin chain

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