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Signatures of Dirac Cones in a DMRG Study of the Kagome Heisenberg Model

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He,  Yin-Chen
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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Pollmann,  Frank
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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Citation

He, Y.-C., Zaletel, M. P., Oshikawa, M., & Pollmann, F. (2017). Signatures of Dirac Cones in a DMRG Study of the Kagome Heisenberg Model. Physical Review X, 7(3): 031020. doi:10.1103/PhysRevX.7.031020.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002D-E294-2
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 p-flux free-fermion model [the parton mean-field ansatz of a U(1) Dirac spin liquid].