在早期的工作中，我们预测了在未掺杂的石墨烯和石墨中存在中性三重态集体模式[Phys. Rev. Lett. { \bf 89}（2002）16402]。本文研究了蜂窝晶格上紧束缚电子与色散中性玻色子相互作用的唯象哈密顿量。我们的哈密顿量是一个推广的Holstein极化子问题的情况下，三重态玻色子与非平凡的色散整个布里渊区。这种集体模式构成了一个重要的激发分支，它可以有助于电子激发的衰减率。这种集体模式的存在改变了石墨和未掺杂石墨烯中电子的光谱性质。特别是这样的集体模式，将在本文中显示，可以解释在石墨上进行的时域测量中丢失的衰变率的一部分。
英文摘要：
In an earlier work we predicted the existence of a neutral triplet collective mode in undoped graphene and graphite [Phys. Rev. Lett. {\bf 89} (2002) 16402]. In this work we study a phenomenological Hamiltonian describing the interaction of tight-binding electrons on honeycomb lattice with such a dispersive neutral triplet boson. Our Hamiltonian is a generalization of the Holstein polaron problem to the case of triplet bosons with non-trivial dispersion all over the Brillouin zone. This collective mode constitutes an important excitation branch which can contribute to the decay rate of the electronic excitations. The presence of such collective mode, modifies the spectral properties of electrons in graphite and undoped graphene. In particular such collective mode, as will be shown in this paper, can account for some part of the missing decay rate in a time-domain measurement done on graphite.
Modes of magnetic resonance of S=1 dimer chain compound NTENP
用电子自旋共振（ESR）技术研究了准一维$S=1$键交替自旋带隙反铁磁体Ni（$_9$ H $_{24}$ N $_4$）NO $_2$（ClO $_4$）（简称NTENP）的自旋动力学.观察到了五种ESR跃迁模式：单重态基态和激发三重态之间的跃迁，集体三重态自旋子能级之间的三种跃迁模式和场诱导反铁磁有序相的反铁磁共振吸收。单重态-三重态和三重态内模表现出一种双峰结构，这是由于在低频范围内磁振子态密度的两个最大值。联合分析所观察到的光谱和其他实验结果允许测试的费米和玻色子模型的适用性。我们的结论是，费米的方法是更合适的特定情况下的NTENP。
Collective excitations in chiral spin liquid: chiral roton and long-wavelength nematic mode
New Cornerstone Science Lab, Department of Physics, The University of Hong Kong（香港大学物理系新基石科学实验室）；HK Institute of Quantum Science & Technology, The University of Hong Kong（香港大学量子科学与技术研究所）；State Key Laboratory of Optical Quantum Materials, The University of Hong Kong（香港大学光学量子材料国家重点实验室）；Department of Physics, School of Science, Westlake University（西湖大学理学院物理系）
