Many-Body Resonance in a Correlated Topological Kagome Antiferromagnet

Songtian Sonia Zhang, Jia Xin Yin, Muhammad Ikhlas, Hung Ju Tien, Rui Wang, Nana Shumiya, Guoqing Chang, Stepan S. Tsirkin, Youguo Shi, Changjiang Yi, Zurab Guguchia, Hang Li, Wenhong Wang, Tay Rong Chang, Ziqiang Wang, Yi Feng Yang, Titus Neupert, Satoru Nakatsuji, M. Zahid Hasan

Research output: Contribution to journalArticle

Abstract

We use scanning tunneling microscopy to elucidate the atomically resolved electronic structure in the strongly correlated kagome Weyl antiferromagnet Mn3Sn. In stark contrast to its broad single-particle electronic structure, we observe a pronounced resonance with a Fano line shape at the Fermi level resembling the many-body Kondo resonance. We find that this resonance does not arise from the step edges or atomic impurities but the intrinsic kagome lattice. Moreover, the resonance is robust against the perturbation of a vector magnetic field, but broadens substantially with increasing temperature, signaling strongly interacting physics. We show that this resonance can be understood as the result of geometrical frustration and strong correlation based on the kagome lattice Hubbard model. Our results point to the emergent many-body resonance behavior in a topological kagome magnet.

Original languageEnglish (US)
Article number046401
JournalPhysical review letters
Volume125
Issue number4
DOIs
StatePublished - Jul 24 2020

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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    Zhang, S. S., Yin, J. X., Ikhlas, M., Tien, H. J., Wang, R., Shumiya, N., Chang, G., Tsirkin, S. S., Shi, Y., Yi, C., Guguchia, Z., Li, H., Wang, W., Chang, T. R., Wang, Z., Yang, Y. F., Neupert, T., Nakatsuji, S., & Hasan, M. Z. (2020). Many-Body Resonance in a Correlated Topological Kagome Antiferromagnet. Physical review letters, 125(4), [046401]. https://doi.org/10.1103/PhysRevLett.125.046401