264 research outputs found
Spin Excitation Spectra of Anisotropic Spin- Triangular Lattice Heisenberg Antiferromagnets
Investigation of dynamical excitations is difficult but crucial to the
understanding of many exotic quantum phenomena discovered in quantum materials.
This is particularly true for highly frustrated quantum antiferromagnets whose
dynamical properties deviate strongly from theoretical predictions made based
on the spin-wave or other approximations. Here we present a large-scale
numerical calculation on the dynamical correlation functions of spin-
triangular Heisenberg model using a state-of-the-art tensor network
renormalization group method. The calculated results allow us to gain for the
first time a comprehensive picture on the nature of spin excitation spectra in
this highly frustrated quantum system. It provides a quantitative account for
all the key features of the dynamical spectra disclosed by inelastic neutron
scattering measurements for , revealing the importance of
the interplay between low- and high-energy excitations and its renormalization
effect to the low-energy magnon bands and high-energy continuums. We identify
the longitudinal Higgs modes in the intermediate-energy scale and predict the
energy and momentum dependence of spectral functions along the three principal
axes that can be verified by polarized neutron scattering experiments.
Furthermore, we find that the spin excitation spectra weakly depend on the
anisotropic ratio of the antiferromagnetic interaction.Comment: 6 pages, 3 figures, and a Supplemental Materia
Toxicities comparison of rotenone and acetone extract of Tephrosiavogelii and Derris trifoliate against Solenopsis invicta
The high rotenone content and the rotenone crude extract of Tephrosia vogelii and Derris trifoliata were evaluated for its efficacy in the control of red imported fire (RIFA), Solenopsis invicta under both laboratory and field conditions. The acetone extracts of D. trifoliata roots and T. vogelii leaves exhibited strong toxicity to macroergate and micrergate of RIFA. When active ingredients of the crude extracts were convert to rotenone, the activity of the acetone extracts were higher than that of rotenone technical material. At the same time, the extracts showed significant inhibitory effect on walking ability and grasping ability of worker ants and stronger than the effect of 98.6% rotenone technical material. Under field conditions, the 0.01% rotenone-bait, formulated with the acetone extract of D. trifoliata roots and T. vogelii leaves, had the same control effect on RIFA as that of 0.01% fipronil-bait when treated after 30 d. The bait formulated with the extract of D. trifoliata exhibited quicker and higher effect on RIFA than that of rotenone technical material. It was showed that the acetone extracts of D. trifoliata roots and T. vogelii leaves are able to control S. invicta under both laboratory and field conditions and can be used as an effective agent against RIFA
Detection of Quasi-periodic Oscillations in SGR 150228213
The detection of quasi-periodic oscillations (QPOs) in magnetar giant flares
(GFs) has brought a new perspective to study the mechanism of magnetar bursts.
Due to the scarcity of GFs, searching QPOs from magnetar short bursts is
reasonable. Here we report the detection of a high frequency QPO at
approximately 110 Hz and a wide QPO at approximately 60 Hz in a short magnetar
burst SGR 150228213, with a confidence level of 3.35. This burst was
initially attributed to 4U 0142+61 by /GBM on location, but we haven't
detected such QPOs in other bursts from this magnetar. We also found that there
was a repeating fast radio burst associated with SGR 150228213 on location.
Finally, we discuss the possible origins of SGR 150228213
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