Thermally populated versus field-induced triplon bound states in the Shastry-Sutherland lattice SrCu2(BO3)2
Thermally populated versus field-induced triplon bound states in the Shastry-Sutherland lattice SrCu2(BO3)2
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DOI：
10.1038/s41535-021-00405-7
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发表时间：
2021-11
影响因子：
5.7
通讯作者：
D. Wulferding;Youngsu Choi;Seungyeol Lee;M. Prosnikov;Y. Gallais;P. Lemmens;Cheng-Cheng Zhong-Cheng;H. Kageyama;Kwang-Yong Choi
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作者：
D. Wulferding;Youngsu Choi;Seungyeol Lee;M. Prosnikov;Y. Gallais;P. Lemmens;Cheng-Cheng Zhong-Cheng;H. Kageyama;Kwang-Yong Choi
Shastry-Sutherland化合物SrCu_2（BO_3）_2具有S = 0的单重基态。强烈的二聚体间相互作用和挫折的汇合产生了一个低能量的激发光谱，包括本地化的三重态以及单重态和三重态的束缚态。它们的动力学由外部磁场和温度控制。在这里，我们采用高场拉曼光谱映射的领域和温度的演变，这种玻色子复合准粒子接近1/8磁化平台。我们的研究揭示了磁场和热涨落在熔化单重态束缚态方面表现出非常相似的效果，但在它们对精细光谱形状的影响上是不同的。这一点，以及在中间场dB = 10 − 16 T中两个单重态束缚态的反交叉，将在受抑相互作用玻色子的相关动力学中进行讨论。
The Shastry–Sutherland compound SrCu2(BO3)2constituting orthogonally coupled dimers harbors anS= 0 singlet ground state. The confluence of strong interdimer interaction and frustration engenders a spectrum of low-energy excitations including localized triplons as well as singlet and triplet bound states. Their dynamics are controlled by an external magnetic field and temperature. Here, we employ high-field Raman spectroscopy to map the field and temperature evolution of such bosonic composite quasiparticles on approaching the 1/8 magnetization plateau. Our study unveils that the magnetic field and thermal fluctuations show remarkably similar effects in melting the singlet bound states, but are disparate in their effects on the fine spectral shapes. This, together with the anti-crossing of two singlet bound states in the intermediate fieldB= 10 − 16 T, is discussed in terms of the correlated dynamics of frustrated, interacting bosons.