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TT: Fachverband Tiefe Temperaturen

TT 30: Frustrated Magnets - Spin Liquids 2 (joint session TT/MA)

TT 30.2: Vortrag

Dienstag, 17. März 2020, 14:15–14:30, HSZ 304

Dirac Spin Liquid on the Spin-1/2 Triangular Heisenberg Antiferromagnet — •Shijie Hu¹, Wei Zhu², Sebastian Eggert¹, and Yin-Chen He³ — ¹Physik und OPTIMAS, Technische Universität Kaiserslautern — ²Natural Sciences, Westlake Institute of Advanced Study, Hangzhou — ³Perimeter Institute, Waterloo

We study the spin liquid candidate of the spin-1/2 J₁-J₂ Heisenberg antiferromagnet on the triangular lattice by means of density matrix renormalization group (DMRG) simulations. By applying an external Aharonov-Bohm flux insertion in an infinitely long cylinder, we find unambiguous evidence for gapless U(1) Dirac spin liquid behavior. The flux insertion overcomes the finite size restriction for energy gaps and clearly shows gapless behavior at the expected wave-vectors. Using the DMRG transfer matrix, the low-lying excitation spectrum can be extracted, which shows characteristic Dirac cone structures of both spinon-bilinear and monopole excitations. Finally, we confirm that the entanglement entropy follows the predicted universal response under the flux insertion [1].

[1] Phys. Rev. Lett. 123, 207203 (2019).