»ã±¨±êÌâ (Title)£ºNew Materials Exploration in Quantum Spin Liquid and Topological Semimetals£¨Á¿×Ó×ÔÐýÒºÌåºÍÍØÆË°ë½ðÊôµÄÐÂ×ÊÁÏË÷Çó£©
»ã±¨ÈË (Speaker)£º·ë×ÓÁ¦£¨ÈÕ±¾¶«¾©´óѧ£©
»ã±¨¹¦·ò (Time)£º2023Äê7ÔÂ3ÈÕ(ÖÜÒ») 14:00
»ã±¨µØÖ· (Place)£ºÐ£±¾²¿ E106
Ô¼ÇëÈË (Inviter)£ºÈÎΰ ½ÌÊÚ
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ÌáÒª (Abstract)£º
New material exploration is essential for searching for exotic phenomena and extending our understanding of fundamental physics. In this talk, I will mainly talk about our new materials exploration in quantum spin liquid (QSL) and topological semimetals (TSM).
In the first part, by introducing the NMR-friendly element fluorine, we synthesized a new QSL candidate Cu3Zn(OH)6FBr and observed the spin-1/2 spinon excitation providing firm evidence for spin fractionalization in a topologically ordered spin system. Then we built a phase diagram between magnetic ordered Cu4(OH)6FBr and topological order Cu3Zn(OH)6FBr[1-2]. In the second part, since the type of high-energy fermion is limited by Poincare symmetry, new types of fermions without any high-energy counterpart may exist in solid-sate materials. Collaborating with the ARPES group, we observed three fermions in MoP grown by the flux method for the first time, and multiple fermions coexisting in PdBiSe [3-4]. Finally, as a typical transport character in topological magnets, the large anomalous Nernst effect (ANE) was studied. We obtained a recorded ANE signal in polycrystalline topological ferromagnet Fe3Ga alloy by tuning the position of the nodal web. This compound provides a promising candidate for waste heat harvest using ANE [5].
Reference:
[1] Z.L. Feng, W. Yi, et. al. Chin. Phys. Lett. 36, 017502, (2018).
[2] Z.L. Feng, Y. Wei, et. al., Phys. Rev. B 98, 155127, (2018).
[3] B.Q. Lv, Z.L. Feng, Q.N. Xu, et. al. Nature 546, 627-631, (2017).
[4] B.Q. Lv, Z.F. Feng, J.Z. Zhao, et. al., Phys. Rev. B 99, 241104(R) (2019).
[5] Z.L. Feng, S. Minami, et. al., Adv. Funct. Mater. 2206519. (2022)
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