Oxygen vacancy-driven orbital multichannel Kondo effect in Dirac nodal line metals IrO2 and RuO2

Sheng-Shiuan Yeh, Ta Kang Su, An Shao Lien, Farzaneh Zamani, Johann Kroha, Chao Ching Liao, Stefan Bernd Kirchner, Juhn-Jong Lin*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


Strong electron correlations have long been recognized as driving the emergence of novel phases of matter. A well recognized example is high-temperature superconductivity which cannot be understood in terms of the standard weak-coupling theory. The exotic properties that accompany the formation of the two-channel Kondo (2CK) effect, including the emergence of an unconventional metallic state in the low-energy limit, also originate from strong electron interactions. Despite its paradigmatic role for the formation of non-standard metal behavior, the stringent conditions required for its emergence have made the observation of the nonmagnetic, orbital 2CK effect in real quantum materials difficult, if not impossible. We report the observation of orbital one- and two-channel Kondo physics in the symmetry-enforced Dirac nodal line (DNL) metals IrO2 and RuO2 nanowires and show that the symmetries that enforce the existence of DNLs also promote the formation of nonmagnetic Kondo correlations. Rutile oxide nanostructures thus form a versatile quantum matter platform to engineer and explore intrinsic, interacting topological states of matter.

Original languageEnglish
Article number4749
Pages (from-to)1-8
Number of pages8
JournalNature Communications
Issue number1
StatePublished - 1 Dec 2020


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