Chapter 11 Kondo insulators

doi:10.1016/s1570-002x(08)80013-4

Cited by 2 publications

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References 77 publications

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“…The emergent electronic properties of Kondo insulators are caused by the interaction of itinerant conduction electrons with a magnetic Kondo lattice formed by localized f electrons. [1,2]. At high temperatures the conduction electrons scatter only weakly at the localized moments but below the Kondo temperature T K the scattering is strong enough that the conduction electrons hybridize with the f -band, opening a gap at E F .…”

Section: Introductionmentioning

confidence: 99%

Consistency between ARPES and STM measurements on SmB6

et al. 2020

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Strongly correlated topological surface states are promising platforms for next-generation quantum applications, but they remain elusive in real materials. The correlated Kondo insulator SmB6 is one of the most promising candidates, with theoretically predicted heavy Dirac surface states supported by transport and scanning tunneling microscopy (STM) experiments. However, a puzzling discrepancy appears between STM and angle-resolved photoemission (ARPES) experiments on SmB6. Although ARPES detects spin-textured surface states, their velocity is an order of magnitude higher than expected, while the Dirac point -the hallmark of any topological system -can only be inferred deep within the bulk valence band. A significant challenge is that SmB6 lacks a natural cleavage plane, resulting in ordered surface domains limited to 10s of nanometers. Here we use STM to show that surface band bending can shift energy features by 10s of meV between domains. Starting from our STM spectra, we simulate the full spectral function as an average over multiple domains with different surface potentials. Our simulation shows excellent agreement with ARPES data, and thus resolves the apparent discrepancy between large-area measurements that average over multiple band-shifted domains and atomically-resolved measurements within a single domain.

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Section: Introductionmentioning

confidence: 99%

Consistency between ARPES and STM measurements on SmB6

et al. 2020

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“…By contrast, the 4 f level in Cerium-based HF systems is located well below the Fermi level, due to which the charge fluctuations are frozen out and the spin fluctuations play the central role. The effective model describing their low-energy physics is known as the Kondo lattice model [2,[4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Phase diagram of the Hubbard-Kondo lattice model from the variational cluster approximation

et al. 2018

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The interplay between the Kondo effect and magnetic ordering driven by the Ruderman-Kittel-Kasuya-Yosida interaction is studied within the two-dimensional Hubbard-Kondo lattice model. In addition to the antiferromagnetic exchange interaction, J ⊥ , between the localized and the conduction electrons, this model also contains the local repulsion, U, between the conduction electrons. We use variational cluster approximation to investigate the competition between the antiferromagnetic phase, the Kondo singlet phase, and a ferrimagnetic phase on square lattice. At half-filling, the Néel antiferromagnetic phase dominates from small to moderate J ⊥ and UJ ⊥ , and the Kondo singlet elsewhere. Sufficiently away from half-filling, the antiferromagnetic phase first gives way to a ferrimagnetic phase (in which the localized spins order ferromagnetically, and the conduction electrons do likewise, but the two mutually align antiferromagnetically), and then to the Kondo singlet phase. arXiv:1804.00917v1 [cond-mat.str-el]

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Chapter 11 Kondo insulators

Cited by 2 publications

References 77 publications

Consistency between ARPES and STM measurements on SmB6

Consistency between ARPES and STM measurements on SmB6

Phase diagram of the Hubbard-Kondo lattice model from the variational cluster approximation

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