Two distinct topological phases in the mixed valence compound YbB6 and its differences from SmB6

Abstract

We discuss the evolution of topological states and their orbital textures in the mixed valence compounds SmB6 and YbB6 within the framework of the generalized gradient approximation plus onsite Coulomb interaction (GGA+U) scheme for a wide range of values of U. In SmB6, the topological Kondo insulator (TKI) gap is found to be insensitive to the value of U, but in sharp contrast, Kondo physics in isostructural YbB6 displays a surprising sensitivity to U. In particular, as U is increased in YbB6, the correlated TKI state in the weak-coupling regime transforms into a d-p-type topological insulator phase with a band inversion between Yb-5d and B-2p orbitals in the intermediate coupling range, without closing the insulating energy gap throughout this process. Our theoretical predictions related to the TKI and non-TKI phases in SmB6 and YbB6 are in substantial accord with recent angle-resolved photoemission spectroscopy (ARPES) experiments.

arXiv comment6 pages, 4 figures URL: http://link.aps.org/doi/10.1103/PhysRevB.91.155151

References in corpus (33)

• Topological Insulators
• Topological insulators and superconductors
• Quantum Spin Hall Effect and Topological Phase Transition in HgTe Quantum Wells
• $Z_2$ Topological Order and the Quantum Spin Hall Effect
• Topological Insulators in Three Dimensions
• Topological Insulators with Inversion Symmetry
• Topological Crystalline Insulators
• Mott physics and band topology in materials with strong spin-orbit interaction
• Topological Kondo Insulators
• Antiferromagnetic topological insulators
• Topological Mott Insulators
• Topological Anderson Insulator
• Theory of the topological Anderson insulator
• Surface electronic structure of the topological Kondo insulator candidate correlated electron system SmB6
• Low-temperature surface conduction in the Kondo insulator SmB${}_6$
• Correlated Topological Insulators with Mixed Valence
• Robust Surface Hall Effect and Nonlocal Transport in SmB6: Indication for an Ideal Topological Insulator
• Observation of in-gap surface states in the Kondo insulator SmB6 by photoemission
• A theory of Topological Kondo Insulators
• Surface and Bulk Electronic Structure of the Strongly Correlated System SmB${}_6$ and Implications for a Topological Kondo Insulator
• Hybridization, Inter-Ion Correlation, and Surface States in the Kondo Insulator SmB6
• Topological Crystalline Kondo Insulator in Mixed Valence Ytterbium Borides
• Polarity-driven surface metallicity in SmB${}_6$
• Actinide Topological Insulator Materials with Strong Interaction
• Momentum-Dependent Hybridization Gap and dispersive in-gap state of The Kondo Semiconductor SmB6
• Plutonium hexaboride is a correlated topological insulator
• Kondo hybridisation and the origin of metallic states at the (001) surface of SmB6
• Topological insulators from the Perspective of first-principles calculations
• Interaction-driven transition between topological states in a Kondo insulator
• Non-Kondo-like Electronic Structure in the Correlated Rare-Earth Hexaboride YbB${}_6$
• Weyl semimetals and superconductors designed in an orbital selective superlattice
• Spin-orbit density wave induced hidden topological order in URu2Si2
• Angle-resolved Photoemission Spectroscopy Study on the Surface States of the Correlated Topological Insulator YbB6

Cited by in corpus (9)

• Electronic structure of YbB${}_6$: Is it a Topological Insulator or not?
• $f$-electron hybridised metallic Fermi surface in magnetic field-induced metallic YbB${}_{12}$
• Critical role of magnetic moments in heavy-fermion materials: revisiting mysteries of SmB${}_6$
• The anomalous antiferromagnetic topological phase in pressurized SmB6
• Electronic and magnetic properties of the topological semimetal SmMg${}_2$Bi${}_2$
• Fermi-Surface Modeling of Light-Rare-Earth Hexaborides with 2D-ACAR Spectroscopy
• Isolated highly localized bands in $\mathrm{Yb}{\mathrm{I}}_2$ monolayer caused by $4f$ orbitals
• Quantum spin Hall density wave insulator of correlated fermions
• Nanoscale Conducting and Insulating Domains on YbB${}_6$