Hybridization gap and Fano resonance in SmB${}_6$

Abstract

We present results of Scanning Tunneling Microscopy and Spectroscopy (STS) measurements on the "Kondo insulator" SmB${}_6$. The vast majority of surface areas investigated was reconstructed but, infrequently, also patches of varying size of non-reconstructed, Sm- or B-terminated surfaces were found. On the smallest patches, clear indications for the hybridization gap and inter-multiplet transitions were observed. On non-reconstructed surface areas large enough for coherent co-tunneling we were able to observe clear-cut Fano resonances. Our locally resolved STS indicated considerable finite conductance on all surfaces independent of their structure.

5 pages, 4 figures

References in corpus (11)

• Surface electronic structure of the topological Kondo insulator candidate correlated electron system SmB6
• Topological surface state in the Kondo Insulator Samarium Hexaboride
• Observation of in-gap surface states in the Kondo insulator SmB6 by photoemission
• Imaging the Fano Lattice to 'Hidden Order' Transition in URu2Si2
• Visualizing heavy fermions emerging in a quantum critical Kondo lattice
• Surface and Bulk Electronic Structure of the Strongly Correlated System SmB${}_6$ and Implications for a Topological Kondo Insulator
• Polarity-driven surface metallicity in SmB${}_6$
• Electron Cotunneling into a Kondo Lattice
• Kondo hybridisation and the origin of metallic states at the (001) surface of SmB6
• The Fano effect in the point contact spectroscopy of heavy electron materials
• Imaging the Kondo Insulating Gap on SmB6

Cited by in corpus (74)

• Colloquium: Topological Band Theory
• Discovery of a quantum limit Chern magnet TbMn6Sn6
• Nanoscale manipulation of the Mott insulating state coupled to charge order in 1T-TaS2
• Tuning bulk and surface conduction in topological Kondo insulator SmB6
• Correlation between bulk thermodynamic measurements and the low temperature resistance plateau in SmB6
• Samarium hexaboride: A trivial surface conductor
• Additional energy scale in SmB${}_6$ at low temperature
• The importance of Charge Fluctuations for the Topological Phase in SmB${}_6$
• Imaging emergent heavy Dirac fermions of a topological Kondo insulator
• Observation of perfect Andreev reflection due to Klein paradox in a topological superconducting state
• Two-Fluid Model for Heavy Electron Physics
• Termination-dependent Surface In-gap States in a Mixed-valent Topological Insulator: SmB${}_6$
• Topological surface states interacting with bulk excitations in the Kondo insulator SmB${}_6$ revealed via planar tunneling spectroscopy
• Composition-spread Growth and the Robust Topological Surface State of Kondo insulator SmB6 Thin Films
• 4$f$ crystal field ground state of the strongly correlated topological insulator SmB${}_6$
• Coexistence of light and heavy surface states in a topological multi-band Kondo insulator
• Magnetotransport Measurements of the Surface States of Samarium Hexaboride using Corbino Structures
• Hysteretic Magnetotransport in SmB6 at Low Magnetic Fields
• Magnetic and defect probes of the SmB${}_6$ surface state
• Bulk Fermi surface of charge-neutral excitations in SmB6 or not: a heat-transport study
• Electronic structure of YbB${}_6$: Is it a Topological Insulator or not?
• Bulk and surface electronic properties of SmB6: a hard x-ray photoelectron spectroscopy study
• Pressure-induced quantum phase transitions in topological insulator YbB6
• Orbital-selective Kondo-lattice and enigmatic f-electrons emerging from inside the antiferromagnetic phase of a heavy fermion
• Surface state reconstruction in ion-damaged SmB_6
• Scanning tunneling spectroscopy and surface quasiparticle interference in models for the strongly correlated topological insulators SmB6 and PuB6
• Racah materials: role of atomic multiplets in intermediate valence systems
• Consistency between ARPES and STM measurements on SmB${}_6$
• Non-trivial surface states of samarium hexaboride at the (111) surface
• Properties of the donor impurity band in mixed valence insulators
• Surface and electronic structure of SmB${}_6$ through Scanning Tunneling Microscopy
• In-gap collective mode spectrum of the Topological Kondo Insulator SmB6
• Observation of a well-defined hybridization gap and in-gap states on the SmB6 (001) surface
• Incomplete Protection of the Surface Weyl Cones of the Kondo Insulator SmB${}_6$: Spin Exciton Scattering
• Theory of Scanning Tunneling Spectroscopy: from Kondo Impurities to Heavy Fermion Materials
• Observation of the superconducting proximity effect in the surface state of SmB6 thin films
• Two-dimensional heavy fermions on the strongly correlated boundaries of Kondo topological insulators
• Chemical and valence reconstruction at the surface of SmB6 revealed with resonant soft x-ray reflectometry
• Comparative study of rare earth hexaborides using high resolution angle-resolved photoemission
• Critical role of magnetic moments in heavy-fermion materials: revisiting mysteries of SmB${}_6$
• The Effects of Spin-Excitons on the Surface States of SmB6: A Photoemission Study
• Spin textures on general surfaces of the correlated topological insulator SmB6
• Bulk Rotational Symmetry Breaking in Kondo Insulator SmB6
• Spin- and angle-resolved photoemission on the topological Kondo Insulator candidate: SmB6
• ARPES insights on the metallic states of YbB6(001): E(k) dispersion, temporal changes and spatial variation
• Surface properties of SmB6 from x-ray photoelectron spectroscopy
• Planar tunneling spectroscopy of the topological Kondo insulator SmB${}_6$
• Chern Kondo Insulator in an Optical Lattice
• Multiple topological Dirac cones in a mixed-valent Kondo semimetal: g-SmS
• A RIXS investigation of the crystal-field splitting of Sm${}^{3+}$ in SmB${}_6$
• Understanding low-temperature bulk transport in samarium hexaboride without relying on in-gap bulk states
• Electronic tuneability of a structurally rigid surface intermetallic and Kondo lattice: CePt${}_5$ / Pt(111)
• Artificial heavy fermions in a van der Waals heterostructure
• Spin-selective tunneling from nanowires of the candidate topological Kondo insulator SmB6
• Direct Evidence for the Existence of Heavy Quasiparticles in the Magnetically Ordered Phase of CeRhIn${}_5$
• Universal properties of the near-gap spectra of SmB6: dynamical mean-field calculations and photoemission experiments
• Robust surface states and coherence phenomena in magnetically alloyed SmB6
• From bad metal to Kondo insulator: temperature evolution of the optical properties of SmB${}_6$
• Irreversible proliferation of magnetic moments at cleaved surfaces of the topological Kondo insulator SmB6
• Breakdown of bulk-projected isotropy in surface electronic states of topological Kondo insulator SmB${}_6$(001)
• Comparative Scanning Tunneling Microscopy Study on Hexaborides
• An STM perspective on hexaborides: Surface states of the Kondo insulator SmB${}_6$
• Topological nature of the Kondo insulator SmB${}_6$ and its sensitiveness to Sm vacancy
• Surface reconstruction in a tight-binding model for the topological Kondo insulator SmB6
• Topological surface states in the Kondo insulator YbB${}_{12}$ revealed via planar tunneling spectroscopy
• Hall coefficient diagnostics of surface state in pressurized SmB6
• Phase stability in SmB${}_6$
• Cotunneling into a Kondo lattice with odd hybridization
• Magnetic effects on Chern Kondo insulator
• Spatial interferences in the electron transport of heavy fermion materials
• Nanoscale Conducting and Insulating Domains on YbB${}_6$
• Emergent photovoltage on SmB6 surface upon bulk-gap evolution revealed by pump-and-probe photoemission spectroscopy
• f-electron charge densities probed using core level non-resonant inelastic x-ray scattering
• Diagnosing a strong topological insulator by quantum oscillations