@article{49fb8bc7e82346a08e0019b8e9ba184d,
title = "Signatures of Dirac cones in a DMRG study of the Kagome Heisenberg model",
abstract = "The antiferromagnetic spin-1=2 Heisenberg model on a kagome lattice is one of the most paradigmatic models in the context of spin liquids, yet the precise nature of its ground state is not understood. We use large-scale density matrix renormalization group simulations (DMRG) on infinitely long cylinders and find indications for the formation of a gapless Dirac spin liquid. First, we use adiabatic flux insertion to demonstrate that the spin gap is much smaller than estimated from previous DMRG simulation. Second, we find that the momentum-dependent excitation spectrum, as extracted from the DMRG transfer matrix, exhibits Dirac cones that match those of a π-flux free-fermion model [the parton mean-field ansatz of a U{\dh}1{\TH} Dirac spin liquid].",
author = "He, {Yin Chen} and Zaletel, {Michael P.} and Masaki Oshikawa and Frank Pollmann",
note = "Funding Information: We thank M. Barkeshli, Y.M Lu, M. Metlitski, A. Vishwanath, and C. Wang for useful discussions. M. Z. thanks D. Huse and S. White for collaboration on related work. Y. C. H. thanks the Institute for the Solid State Physics, University of Tokyo, where this project was initiated, for hospitality. Y. C. H. is supported by a postdoctoral fellowship from the Gordon and Betty Moore Foundation, under the EPiQS initiative, GBMF4306, at Harvard University. This work was supported in part by JSPS Strategic International Networks Program No. R2604 “TopoNet” (Y. C. H. and M. O.), JSPS Grant-in-Aid for Scientific Research (KAKENHI) No. 16K05469 (M. O.), and DFG via SFB 1143. The work of M. Z. was performed in part at the Aspen Center for Physics, which is supported by National Science Foundation Grant No. PHY-1066293. Y. C. H., M. Z., M. O., and F. P. acknowledge the hospitality of the Kavli Institute for Theoretical Physics, which is supported in part by the National Science Foundation under Grant No. PHY-11-25915.",
year = "2017",
month = jul,
day = "28",
doi = "10.1103/PhysRevX.7.031020",
language = "English (US)",
volume = "7",
journal = "Physical Review X",
issn = "2160-3308",
publisher = "American Physical Society",
number = "3",
}