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Intermediate and spin-liquid phase of the half-filled honeycomb Hubbard model

Chen, Qiaoni and Booth, George H. and Sharma, Sandeep and Knizia, Gerald and Chan, Garnet Kin-Lic (2014) Intermediate and spin-liquid phase of the half-filled honeycomb Hubbard model. Physical Review B, 89 (16). Art. No. 165134. ISSN 2469-9950. https://resolver.caltech.edu/CaltechAUTHORS:20170113-123256350

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Abstract

We obtain the phase diagram of the half-filled honeycomb Hubbard model with density matrix embedding theory, to address recent controversy at intermediate couplings. We use clusters from 2–12 sites and lattices at the thermodynamic limit. We identify a paramagnetic insulating state, with possible hexagonal cluster order, competitive with the antiferromagnetic phase at intermediate coupling. However, its stability is strongly cluster and lattice size dependent, explaining controversies in earlier work. Our results support the paramagnetic insulator as being a metastable, rather than a true, intermediate phase, in the thermodynamic limit.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1103/PhysRevB.89.165134DOIArticle
http://journals.aps.org/prb/abstract/10.1103/PhysRevB.89.165134PublisherArticle
https://arxiv.org/abs/1402.5622arXivDiscussion Paper
ORCID:
AuthorORCID
Sharma, Sandeep0000-0002-6598-8887
Knizia, Gerald0000-0002-7163-4823
Chan, Garnet Kin-Lic0000-0001-8009-6038
Additional Information:© 2014 American Physical Society. Received 23 February 2014; revised manuscript received 7 April 2014; published 28 April 2014. We gratefully acknowledge S. Sorella and Y. Otsuka for providing the energy data from their QMC calculations. The main funding for this work was from the U.S Department of Energy, DE-SC0008624 and DE-SC0010530. Additional funding was provided through the DOE-CMCSN program DESC0006613 through support of G.K. Initial funding for Q.C. was provided by a seed grant from the NSF, MRSEC Award No. NSF-DMR 0819860.
Funders:
Funding AgencyGrant Number
Department of Energy (DOE)DE-SC0008624
Department of Energy (DOE)DE-SC0010530
Department of Energy (DOE)DE-SC0006613
NSFDMR-0819860
Issue or Number:16
Classification Code:PACS 75.10.Kt, 71.10.Fd, 71.30.+h
Record Number:CaltechAUTHORS:20170113-123256350
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20170113-123256350
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:73486
Collection:CaltechAUTHORS
Deposited By: Donna Wrublewski
Deposited On:20 Jan 2017 00:15
Last Modified:03 Oct 2019 16:28

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