Angle-resolved Photoemission Spectroscopy Study on the Surface States of the Correlated Topological Insulator YbB6

Xia, Mingxu; Jiang, Juan; Ye, Z. R.; Wang, Y. H.; Zhang, Y.; Chen, Sudi; Niu, X. H.; Xu, D. F.; Chen, F.; Chen, X. H.; Xie, B. P.; Zhang, T.; Feng, D. L.

doi:10.1038/srep05999

Cited by 39 publications

(19 citation statements)

References 43 publications

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“…It also implies that understanding phonon dynamics will be critical in elucidating any topological properties of related hexaborides, e.g. YbB 6 , as has recently been suggested [41][42][43].…”

Section: Resultsmentioning

confidence: 99%

Correlation between Bulk Thermodynamic Measurements and the Low-Temperature-Resistance Plateau inSmB6

et al. 2014

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Topological insulators are materials characterized by dissipationless, spin-polarized surface states resulting from nontrivial band topologies. Recent theoretical models and experiments suggest that SmB 6 is the first topological Kondo insulator, in which the topologically nontrivial band structure results from electron-electron interactions via Kondo hybridization. Here, we report that the surface conductivity of SmB 6 increases systematically with bulk carbon content. Further, addition of carbon is linked to an increase in n-type carriers, larger low-temperature electronic contributions to the specific heat with a characteristic temperature scale of T Ã ¼ 17 K, and a broadening of the crossover to the insulating state. Additionally, x-ray absorption spectroscopy shows a change in Sm valence at the surface. Our results highlight the importance of phonon dynamics in producing a Kondo insulating state and demonstrate a correlation between the bulk thermodynamic state and the low-temperature resistance of SmB 6 .

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Section: Resultsmentioning

confidence: 99%

Correlation between Bulk Thermodynamic Measurements and the Low-Temperature-Resistance Plateau inSmB6

et al. 2014

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“…GdB 6 is a localized 4f system with a ferromagnetic order at low temperatures [ 19 ]. YbB 6 is a topology Kondo insulator at low temperatures, and is a classical mixed valence narrow band gap semiconductor [ 1 , 20 , 21 ]. Structural studies are also presented in Ref.…”

Section: Introductionmentioning

confidence: 99%

Topological Phase and Strong Correlation in Rare-Earth Hexaborides XB6 (X = La, Ce, Pr, Nd, Pm, Sm, Eu)

Hung

Jeng

2020

Materials

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The rare-earth hexaboride SmB6, known as the topological Kondo insulator, has attracted tremendous attention in recent years. It was revealed that the topological phase of SmB6 is insensitive to the value of on-site Coulomb interactions (Hubbard U), indicating that the topological phase in SmB6 is robust against strong correlations. On the contrary, the isostructural YbB6 displays a sensitivity to the Hubbard U value. As U increases, YbB6 transforms from topological Kondo insulator to trivial insulator, showing the weak robustness of the topological phase of YbB6 against U. Consequently, the dependence of the topological phase on Hubbard U is a crucial issue in the rare-earth hexaboride family. In this work, we investigate the structural and electronic properties of rare-earth hexaboride compounds through first-principles calculations based on density functional theory. By taking the strong correlations into consideration using a wide range of on-site U values, we study the evolution of the topological phases in rare-earth hexaboride (XB6, X = La, Ce, Pr, Nd, Pm, Sm, Eu). Unlike YbB6, the topological trends in all the examples of XB6 studied in this work are insensitive to the U values. We conclude that in addition to the well-known SmB6, PmB6, NdB6 and EuB6 are also topologically nontrivial compounds, whereas LaB6, CeB6 and PrB6 are topologically trivial metal.

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“…Meanwhile, YbB 6 is also predicted to be a TKI. Shi and Feng et al [80,81] investigated the surface and bulk gap structures of YbB 6 by angle-resolved photoemission spectroscopy (ARPES). Shi disclosed that the f -orbitals of YbB 6 are fully occupied, and Yb exists in bivalence states, which is different from mixed-valence Sm in SmB 6 .…”

Section: Optoelectronic Propertiesmentioning

confidence: 99%

“…Furthermore, the metallic surface states of YbB 6 are believed to be topological surface states, which are spin-polarized in plane and locked to the crystal momentum. Feng et al [81] directly observed the bands around the time-reversal invariant momenta exhibiting an obvious linearly dispersive relationship. The in-gap states possess the chirality of orbital angular momentum, which is attributed to the chiral spin texture.…”

Section: Optoelectronic Propertiesmentioning

confidence: 99%

Inorganic Boron-Based Nanostructures: Synthesis, Optoelectronic Properties, and Prospective Applications

et al. 2019

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Inorganic boron-based nanostructures have great potential for field emission (FE), flexible displays, superconductors, and energy storage because of their high melting point, low density, extreme hardness, and good chemical stability. Until now, most researchers have been focused on one-dimensional (1D) boron-based nanostructures (rare-earth boride (REB6) nanowires, boron nanowires, and nanotubes). Currently, two-dimensional (2D) borophene attracts most of the attention, due to its unique physical and chemical properties, which make it quite different from its corresponding bulk counterpart. Here, we offer a comprehensive review on the synthesis methods and optoelectronics properties of inorganic boron-based nanostructures, which are mainly concentrated on 1D rare-earth boride nanowires, boron monoelement nanowires, and nanotubes, as well as 2D borophene and borophane. This review paper is organized as follows. In Section I, the synthesis methods of inorganic boron-based nanostructures are systematically introduced. In Section II, we classify their optical and electrical transport properties (field emission, optical absorption, and photoconductive properties). In the last section, we evaluate the optoelectronic behaviors of the known inorganic boron-based nanostructures and propose their future applications.

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Angle-resolved Photoemission Spectroscopy Study on the Surface States of the Correlated Topological Insulator YbB6

Cited by 39 publications

References 43 publications

Correlation between Bulk Thermodynamic Measurements and the Low-Temperature-Resistance Plateau inSmB6

Correlation between Bulk Thermodynamic Measurements and the Low-Temperature-Resistance Plateau inSmB6

Topological Phase and Strong Correlation in Rare-Earth Hexaborides XB6 (X = La, Ce, Pr, Nd, Pm, Sm, Eu)

Inorganic Boron-Based Nanostructures: Synthesis, Optoelectronic Properties, and Prospective Applications

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