Electronic correlations and topology in Kondo insulator PuB$_6$
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866917184885751808 |
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| author | Gofryk, K. Zhou, S. Poudel, N. Dice, N. Murray, D. Pavlov, T. Marianetti, C. |
| author_facet | Gofryk, K. Zhou, S. Poudel, N. Dice, N. Murray, D. Pavlov, T. Marianetti, C. |
| contents | Utilizing a combination of dynamical mean field theory and density functional theory (DMFT/DFT), it has been theoretically proposed that PuB$_6$ is a strongly correlated topological insulator characterized by nontrivial $\mathbf{Z}_{2}$ topological invariants and metallic surface states (\textit{X. Deng et al., Phys. Rev. Lett. 111, 176404 (2013)}). Here, we demonstrate through low-temperature magneto-transport measurements and first-principles calculations that PuB$6$ exhibits characteristics of a topological Kondo insulating state. These features include a transition in electrical resistivity from high-temperature, thermally activated behavior with a narrow gap at the Fermi level ($Δρ \sim$ 20 meV) to a distinctive low-temperature plateau, as well as a surface-to-volume dependence of electrical resistivity at low temperatures. The topological nature of PuB$_6$ is further supported by the theoretical calculations, which show that GGA+$U$ is capable of capturing electronic, topological, and lattice properties of PuB$_6$ with much lower computational cost than DMFT. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2601_02312 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Electronic correlations and topology in Kondo insulator PuB$_6$ Gofryk, K. Zhou, S. Poudel, N. Dice, N. Murray, D. Pavlov, T. Marianetti, C. Strongly Correlated Electrons Materials Science Utilizing a combination of dynamical mean field theory and density functional theory (DMFT/DFT), it has been theoretically proposed that PuB$_6$ is a strongly correlated topological insulator characterized by nontrivial $\mathbf{Z}_{2}$ topological invariants and metallic surface states (\textit{X. Deng et al., Phys. Rev. Lett. 111, 176404 (2013)}). Here, we demonstrate through low-temperature magneto-transport measurements and first-principles calculations that PuB$6$ exhibits characteristics of a topological Kondo insulating state. These features include a transition in electrical resistivity from high-temperature, thermally activated behavior with a narrow gap at the Fermi level ($Δρ \sim$ 20 meV) to a distinctive low-temperature plateau, as well as a surface-to-volume dependence of electrical resistivity at low temperatures. The topological nature of PuB$_6$ is further supported by the theoretical calculations, which show that GGA+$U$ is capable of capturing electronic, topological, and lattice properties of PuB$_6$ with much lower computational cost than DMFT. |
| title | Electronic correlations and topology in Kondo insulator PuB$_6$ |
| topic | Strongly Correlated Electrons Materials Science |
| url | https://arxiv.org/abs/2601.02312 |