Electronic correlations in nodal-line semimetals

Yinming Shao, A. N. Rudenko, Jin Hu, Zhiyuan Sun, Yanglin Zhu, Seongphill Moon, A. J. Millis, Shengjun Yuan, A. I. Lichtenstein, Dmitry Smirnov, Z. Q. Mao, M. I. Katsnelson, D. N. Basov

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

Dirac fermions with highly dispersive linear bands1–3 are usually considered weakly correlated due to the relatively large bandwidths (W) compared to Coulomb interactions (U). With the discovery of nodal-line semimetals, the notion of the Dirac point has been extended to lines and loops in momentum space. The anisotropy associated with nodal-line structure gives rise to greatly reduced kinetic energy along the line. However, experimental evidence for the anticipated enhanced correlations in nodal-line semimetals is sparse. Here, we report on prominent correlation effects in a nodal-line semimetal compound, ZrSiSe, through a combination of optical spectroscopy and density functional theory calculations. We observed two fundamental spectroscopic hallmarks of electronic correlations: strong reduction (1/3) of the free-carrier Drude weight and also the Fermi velocity compared to predictions of density functional band theory. The renormalization of Fermi velocity can be further controlled with an external magnetic field. ZrSiSe therefore offers the rare opportunity to investigate correlation-driven physics in a Dirac system.

Original languageEnglish (US)
Pages (from-to)636-641
Number of pages6
JournalNature Physics
Volume16
Issue number6
DOIs
StatePublished - Jun 1 2020

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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