Boston University Libraries OpenBU
    JavaScript is disabled for your browser. Some features of this site may not work without it.
    View Item 
    •   OpenBU
    • BU Open Access Articles
    • BU Open Access Articles
    • View Item
    •   OpenBU
    • BU Open Access Articles
    • BU Open Access Articles
    • View Item

    Critical level crossings and gapless spin liquid in the square-lattice spin-1/2 J1-J2 Heisenberg antiferromagnet

    Thumbnail
    Date Issued
    2017-02-27
    Author(s)
    Wang, Ling
    Sandvik, Anders W.
    Share to FacebookShare to TwitterShare by Email
    Export Citation
    Download to BibTex
    Download to EndNote/RefMan (RIS)
    Metadata
    Show full item record
    Permanent Link
    https://hdl.handle.net/2144/32891
    Version
    Accepted manuscript
    Citation (published version)
    Ling Wang, Anders W Sandvik. 2017. "Critical level crossings and gapless spin liquid in the square-lattice spin-1/2 J1-J2 Heisenberg antiferromagnet."
    Abstract
    We use the DMRG method to calculate several energy eigenvalues of the frustrated S = 1 / 2 square-lattice J 1 - J 2 Heisenberg model on 2 L × L cylinders with L ≤ 10. We identify excited-level crossings versus the coupling ratio g = J 2 /J 1 and study their drifts with the system size L . The lowest singlet-triplet and singlet-quintuplet crossings converge rapidly (with corrections ∝ L − 2 ) to different g values, and we argue that these correspond to ground-state transitions between the N ́eel antiferromagnet and a gapless spin liquid, at g c 1 ≈ 0 . 46, and between the spin liquid and a valence-bond-solid at g c 2 ≈ 0 . 52. Previous studies of order parameters were not able to positively discriminate between an extended spin liquid phase and a critical point. We expect level-crossing analysis to be a generically powerful tool in DMRG studies of quantum phase transitions.
    Collections
    • BU Open Access Articles [1490]
    • CAS: Physics: Scholarly Papers [56]


    Boston University
    Contact Us | Send Feedback | Help
     

     

    Browse

    All of OpenBUCommunities & CollectionsIssue DateAuthorsTitlesSubjectsThis CollectionIssue DateAuthorsTitlesSubjects

    Deposit Materials

    LoginNon-BU Registration

    Statistics

    Most Popular ItemsStatistics by CountryMost Popular Authors

    Boston University
    Contact Us | Send Feedback | Help