Dynamical Structure Factor of Triangular Heisenberg Model

GHIOLDI, ESTEBAN A.; KAMIYA, YOSHITOMO; BATISTA, CRISTIAN D.; ZHANG, SHANG-SHUN; TRUMPER, ADOLFO E.; GONZALEZ, MATÍAS G.; MANUEL, LUIS O.

Los Angeles

Congreso; APS March Meeting 2018; 2018

American Physical Society (APS)

We compute the zero temperature dynamical structure factor S(q,w) of the triangular lattice Heisenberg model using a Schwinger Boson approach that includes the Gaussian fluctuations (1/N correction) of the saddle point solution. While the ground state of this model exhibits a well-known 120° magnetic ordering, the excitation spectrum revealed by S(q,w) has a strong quantum character that is not captured by low-order 1/S expansions. The low-energy magnons consist of two spinon bound states confined by gauge fluctuations of the auxiliary fields, which can produce internal structure of the magnon peaks. In addition, the high-energy continuum of spinon modes extends up to about three times the single-magnon bandwidth.