تقرير
Thermal decay of two-spinon bound states in quasi-2D triangular antiferromagnets
| العنوان: | Thermal decay of two-spinon bound states in quasi-2D triangular antiferromagnets |
|---|---|
| المؤلفون: | Pomponio, I. L., Ghioldi, E. A., Gazza, C. J., Manuel, L. O., Trumper, A. E. |
| سنة النشر: | 2024 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Strongly Correlated Electrons |
| الوصف: | We analyze the temperature evolution of the anomalous magnetic spectrum of the spin-1/2 triangular quantum Heisenberg antiferromagnet, which is proximate to a quantum critical point. Recently, its low energy excitations have been identified with two-spinon bound states, well defined in an ample region of the Brillouin zone. In this work, we compute the thermal magnetic spectrum within a Schwinger boson approach, incorporating Gaussian fluctuations around the saddle-point approximation. In order to account for a finite N\'eel temperature $T_N$, we incorporate an exchange interaction between triangular layers. As temperature rises, the dispersion relation of the two-spinon bound states, representing single-magnon excitations, remains unchanged but becomes mixed with the thermally activated spinon continuum. Consequently, a crossover occurs at a temperature $T^* \simeq 0.75 T_N$, defining a "terminated Goldstone regime" between $T^*$ and $T_N$, where only the Goldstone modes survives as well-defined magnon excitations, up to the N\'eel temperature. Our results support the idea that the fractionalization of magnons near a quantum critical point can be extended to more realistic quasi-2D frustrated antiferromagnets. Comment: 13 pages, 8 figures |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/2406.17165 |
| رقم الأكسشن: | edsarx.2406.17165 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |