Unconventional Fermi surface in an insulating state

Abstract

Insulators occur in more than one guise, a recent finding was a class of topological insulators, which host a conducting surface juxtaposed with an insulating bulk. Here we report the observation of an unusual insulating state with an electrically insulating bulk that simultaneously yields bulk quantum oscillations with characteristics of an unconventional Fermi liquid. We present quantum oscillation measurements of magnetic torque in high purity single crystals of the Kondo insulator SmB6, which reveal quantum oscillation frequencies characteristic of a large three-dimensional conduction electron Fermi surface similar to the metallic rare earth hexaborides such as PrB6 and LaB6. The quantum oscillation amplitude strongly increases at low temperatures, appearing strikingly at variance with conventional metallic behaviour.

References in corpus (13)

• Topological Kondo Insulators
• String Theory, Quantum Phase Transitions and the Emergent Fermi-Liquid
• Hall-effect evolution across a heavy-fermion quantum critical point
• Singular Fermi Liquids
• Quantum oscillations in Kondo Insulator SmB${}_6$
• Quantum Criticality without Tuning in the Mixed Valence Compound beta-YbAlB4
• Towards resolution of the Fermi surface in underdoped high-Tc superconductors
• Correlation between bulk thermodynamic measurements and the low temperature resistance plateau in SmB6
• Quantum phase transitions in heavy fermion metals and Kondo insulators
• Large, high quality single-crystals of the new Topological Kondo Insulator, SmB6
• Valence and magnetic ordering in intermediate valence compounds : TmSe versus SmB6
• Generalized Lifshitz-Kosevich scaling at quantum criticality from the holographic correspondence
• Low-temperature magnetic fluctuations in the Kondo insulator SmB6

Cited by in corpus (173)

• Electronic structure of quantum materials studied by angle-resolved photoemission spectroscopy
• Interacting topological insulators: a review
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• Non-Hermitian perspective of the band structure in heavy-fermion systems
• Quantum Oscillation from In-gap States and non-Hermitian Landau Level Problem
• Topological quantum materials from the viewpoint of chemistry
• Unconventional mass enhancement around the Dirac nodal loop in ZrSiS
• Flat bands, strange metals, and the Kondo effect
• Quantum Oscillations of Electrical Resistivity in an Insulator
• Quantum oscillations without a Fermi surface and the anomalous de Haas-van Alphen effect
• Incoherent transport across the strange metal regime of highly overdoped cuprates
• Fermi surface in the absence of a Fermi liquid in the Kondo insulator SmB${}_6$
• Temperature-field phase diagram of extreme magnetoresistance in lanthanum monopnictides
• Quantum oscillation in narrow-gap topological insulators
• Kondo Breakdown and Quantum Oscillations in SmB${}_6$
• Excitons in topological Kondo insulators - theory of thermodynamic and transport anomalies in SmB${}_6$
• DMFT reveals the non-Hermitian topology in heavy-fermion systems
• Mixed-valence insulators with neutral Fermi surfaces
• Skyrme insulators: insulators at the brink of superconductivity
• Landau Quantization and Highly Mobile Fermions in an Insulator
• Quantum oscillations in insulators with neutral Fermi surfaces
• Emergence of supersymmetric quantum electrodynamics
• Extremely high conductivity observed in the triple point topological metal MoP
• Additional energy scale in SmB${}_6$ at low temperature
• Imaging emergent heavy Dirac fermions of a topological Kondo insulator
• Anomalous 3D bulk AC conduction within the Kondo gap of SmB${}_6$ single crystals
• Fermi surfaces in Kondo insulators
• Chemical potential asymmetry and quantum oscillations in insulators
• Exceptional band touching for strongly correlated systems in equilibrium
• Quantum oscillations in flux-grown SmB6 with embedded aluminum
• Robustness of the Insulating Bulk in the Topological Kondo Insulator SmB${}_6$
• Relation between exceptional points and the Kondo effect in $f$-electron materials
• Unconventional thermal metallic state of charge-neutral fermions in an insulator
• Topological surface states interacting with bulk excitations in the Kondo insulator SmB${}_6$ revealed via planar tunneling spectroscopy
• The Anomalous de Haas-van Alphen Effect in InAs/GaSb quantum wells
• Breakdown of the Kondo insulating state in SmB6 by introducing Sm vacancies
• Bulk Fermi surface of charge-neutral excitations in SmB6 or not: a heat-transport study
• Anomalous Quantum Oscillations in a Heterostructure of Graphene on a Proximate Quantum Spin Liquid
• Unusual high-field metal in a Kondo insulator
• Anomalous Quantum Oscillations of Interacting Electron-hole Gases in Inverted Type-II InAs/GaSb Quantum Wells
• Theory of Quantum Oscillations of Magnetization in Kondo Insulators
• Majoranas in mixed-valence insulators
• Anomalous Conductance Oscillations in the Hybridization Gap of InAs/GaSb Quantum Wells
• Pressure-induced quantum phase transitions in topological insulator YbB6
• Quantum oscillations in strongly correlated topological Kondo insulators
• A solvable 3D Kondo lattice exhibiting odd-frequency pairing and order fractionalization
• Non-trivial surface states of samarium hexaboride at the (111) surface
• Field-dependent heat transport in the Kondo insulator SmB6 : phonons scattered by magnetic impurities
• Properties of the donor impurity band in mixed valence insulators
• Quantum Oscillations from Fermi Sea
• Surface and electronic structure of SmB${}_6$ through Scanning Tunneling Microscopy
• Spin-liquid insulators can be Landau's Fermi liquids
• Magnetic field-tuned quantum criticality in a Kondo insulator
• Quantum oscillations in interaction-driven insulators
• Unconventional Magnetic Oscillations in Kagome Mott Insulators
• Observation of the superconducting proximity effect in the surface state of SmB6 thin films
• Anomalous quantum oscillations and evidence for a non-trivial Berry phase in SmSb
• A highly asymmetric nodal semimetal in bulk SmB6
• Visualizing the atomic-scale origin of metallic behavior in Kondo insulators
• Magnetic states in a three-dimensional topological Kondo insulator
• Quantum oscillations in 2D insulators induced by graphite gates
• Solvable Periodic Anderson Model with Infinite-Range Hatsugai-Kohmoto Interaction: Ground-states and beyond
• Intrinsic bulk quantum oscillations in a bulk unconventional insulator SmB${}_6$
• Topological phase in $1D$ topological Kondo insulator: $Z_2$ topological insulator, Haldane-like phase and Kondo breakdown
• Fractionalized Fermi liquid on the surface of a topological Kondo insulator
• Cyclotron resonance inside the Mott gap: a fingerprint of emergent neutral fermions
• Metallic surface states in a correlated d-electron topological Kondo insulator candidate FeSb2
• Quantum Oscillation of Thermally Activated Conductivity in a Monolayer WTe${}_2$-like Excitonic Insulator
• Quantum Oscillations of the Quasiparticle Lifetime in a Metal
• Topological surface conduction in Kondo insulator YbB${}_{12}$
• $f$-electron hybridised metallic Fermi surface in magnetic field-induced metallic YbB${}_{12}$
• A Quantum Impurity Model for Anyons
• Resistivity saturation in Kondo insulators
• Theory of Difference Frequency Quantum Oscillations
• Quantum Oscillations in the Magnetisation and Density of States of Insulators
• Critical role of magnetic moments in heavy-fermion materials: revisiting mysteries of SmB${}_6$
• Definitive Surface Magnetotransport Study of SmB${}_6$
• Topological Kondo insulators in one dimension: Continuous Haldane-type ground-state evolution from the strongly-interacting to the non-interacting limit
• The Effects of Spin-Excitons on the Surface States of SmB6: A Photoemission Study
• Hall anomaly, Quantum Oscillations and Possible Lifshitz Transitions in Kondo Insulator YbB${}_{12}$: Evidence for Unconventional Charge Transport
• Magnetic impurities in Kondo insulators: An application to samarium hexaboride
• Spin textures on general surfaces of the correlated topological insulator SmB6
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• Bulk Rotational Symmetry Breaking in Kondo Insulator SmB6
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• Soluble limit and criticality of fermions in Z2 gauge theories
• Evidence of non-trivial Berry phase and Kondo physics in SmBi
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• Enhanced quantum oscillations in Kondo insulators
• Radio Frequency Tunable Oscillator Device Based on SmB6 Microcrystal
• The anomalous antiferromagnetic topological phase in pressurized SmB6
• Nonequilibrium Magnetic Oscillation with Cylindrical Vector Beams
• Topology of SmB${}_6$ determined by dynamical mean field theory
• Topological Kondo semimetal and insulator in AB-stacked heterobilayer transition metal dichalcogenides
• Luttinger sum rules and spin fractionalization in the SU(N) Kondo Lattice
• Planar tunneling spectroscopy of the topological Kondo insulator SmB${}_6$
• Electronic Density of States of a $U\left(1\right)$ Quantum Spin Liquid with Spinon Fermi Surface. I. Orbital Magnetic Field Effects
• Oscillations of the thermal conductivity observed in the spin-liquid state of $\alpha$-RuCl${}_3$
• Quantum oscillations in a doped Mott insulator beyond Onsager's relation
• Quantum spin fluctuations in the bulk insulating state of pure and Fe-doped SmB6
• Reduction of the low-temperature bulk gap in samarium hexaboride under high magnetic fields
• Three-quarter Dirac points, Landau levels and magnetization in $\alpha$-(BEDT-TTF)${}_2$I${}_3$
• A RIXS investigation of the crystal-field splitting of Sm${}^{3+}$ in SmB${}_6$
• Signature of surface state coupling in thin films of the topological Kondo insulator SmB${}_6$ from anisotropic magnetoresistance
• Low-frequency Quantum Oscillations from Interactions in Layered Metals
• Puzzle maker in SmB6: accompany-type valence fluctuation state
• Fragility of the Kondo insulating gap against disorder: relevance to recent puzzles in topological Kondo insulators
• Charge-Neutral Electronic Excitations in Quantum Insulators
• Ultrafast terahertz spectroscopy study of Kondo insulating thin film SmB${}_6$: evidence for an emergent surface state
• Charge neutral fermions and magnetic field driven instability in insulating YbIr${}_3$Si${}_7$
• Bulk transport paths through defects in floating zone and Al flux grown SmB${}_6$
• Global Phase Diagram and Momentum Distribution of Single-Particle Excitations in Kondo insulators
• Impurities or a neutral Fermi surface? A further examination of the low-energy ac optical conductivity of SmB${}_6$
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• Finite temperature physics of $1D$ topological Kondo insulator: Stable Haldane phase, Emergent energy scale and Beyond
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• Altermagnetism in Heavy Fermion Systems: Mean-Field study on Kondo Lattice
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• Fluctuation-dominated quantum oscillations in excitonic insulators
• Cyclotron resonance in Kondo insulator
• Anomalies in a slightly doped insulator with strong particle-hole asymmetry and narrow gap---the case for SmB${}_6$?
• How to identify and characterize strongly correlated topological semimetals
• Tunable skyrmion crystals and topological quantum oscillations in magnetic metals
• From bad metal to Kondo insulator: temperature evolution of the optical properties of SmB${}_6$
• Effect of many-body interaction on de Haas-van Alphen oscillations in insulators
• Quantum Oscillations in an Impurity-Band Anderson Insulator
• Fermi-Surface Modeling of Light-Rare-Earth Hexaborides with 2D-ACAR Spectroscopy
• de Haas van Alphen oscillations in hybridization-gap insulators as a sudden change in the diamagnetic moment of Landau levels
• Breakdown of bulk-projected isotropy in surface electronic states of topological Kondo insulator SmB${}_6$(001)
• Quantum oscillations in field-induced correlated insulators of a moiré superlattice
• Topological nature of the Kondo insulator SmB${}_6$ and its sensitiveness to Sm vacancy
• Microwave Meissner Screening of Proximity coupled Topological Insulator / Superconductor Bilayers
• Tunable non-Lifshitz-Kosevich temperature dependence of Shubnikov-de Haas oscillation amplitudes in SmSb
• Quantum Oscillation in Excitonic Insulating Electron-Hole Bilayer
• Low-energy excitations and transport functions of the one-dimensional Kondo insulator
• Notes on Quantum oscillation for Hatsugai-Kohmoto model
• The Future of the Correlated Electron Problem
• Universal Signatures of Majorana-like Quasiparticles in Strongly Correlated Landau-Fermi Liquids
• The Detection of Unconventional Quantum Oscillations in Insulating 2D Materials
• Interband scattering- and nematicity-induced quantum oscillation frequency in FeSe
• Hall coefficient diagnostics of surface state in pressurized SmB6
• Topological surface states in the Kondo insulator YbB${}_{12}$ revealed via planar tunneling spectroscopy
• Temperature-driven change in band structure reflecting spin-charge separation of Mott and Kondo insulators
• Slow crystalline electric field fluctuations in the Kondo lattice SmB${}_6$
• Emergence of electronic modes by doping Kondo insulators in the Kondo lattice and periodic Anderson models
• Mixed-valence state in the dilute-impurity regime of La-substituted SmB${}_6$
• Anomalously large spin-current voltages on the surface of SmB${}_6$
• Exotic quantum statistics and thermodynamics from a number-conserving theory of Majorana fermions
• Low-temperature theory of inversion and quantum oscillations in Kondo insulators
• Magnetic effects on Chern Kondo insulator
• Disordered 2D ferromagnetism at the surface of FeSi
• A Mean-Field Study of Quantum Oscillations in Two-Dimensional Kondo Insulators
• Surface excitations relaxation in the Kondo insulator Sm${}_{1-x}$Gd${}_x$B${}_6$
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• Thermoelectric signals of state transition in polycrystalline SmB6
• Quantum oscillations in the heat capacity of Kondo insulator YbB12
• Importance of orbital fluctuations for the magnetic dynamics in heavy-fermion compound SmB${}_6$
• Kondo-coupled van der Waals antiferromagnet with high-mobility quasiparticles
• Understanding one-dimensional topological Kondo insulator: Poor man's non-uniform antiferromagnetic mean-field theory versus quantum Monte Carlo simulation
• Observation of the superconducting proximity effect from surface states in SmB${}_6$/YB${}_6$ thin film heterostructures via terahertz spectroscopy
• Inverse-current quantum electro-oscillations in a charge-density wave insulator
• Anomalous quantum oscillations from boson-mediated interband scattering
• Quantum oscillations of Kondo screening phases in strong magnetic fields
• Anomalous Landau levels and quantum oscillation in rotation-invariant insulators
• CeFe${}_2$Al${}_{10}$: a Correlated Metal with a Fermi Surface Exhibiting Nonmetallic Conduction
• Theoretical investigation of quantum oscillations of specific heat in Kondo insulators
• Search for magnetoacoustic quantum oscillations in the insulating phase of YbB${}_{12}$
• Resolving the Thermal Paradox: Many-body localization or fractionalization?
• Anomalous 4$f$ fine structure in TmSe${}_{1-x}$Te${}_x$ across the metal-insulator transition