Electronic correlation determining correlated plasmons in Sb-doped Bi${}_2$Se${}_3$

Abstract

Electronic correlation is believed to play an important role in exotic phenomena such as insulator-metal transition, colossal magneto resistance and high temperature superconductivity in correlated electron systems. Recently, it has been shown that electronic correlation may also be responsible for the formation of unconventional plasmons. Herewith, using a combination of angle-dependent spectroscopic ellipsometry, angle resolved photoemission spectroscopy and Hall measurements all as a function of temperature supported by first-principles calculations, the existence of low-loss high-energy correlated plasmons accompanied by spectral weight transfer, a fingerprint of electronic correlation, in topological insulator (Bi${}_{0.8}$Sb${}_{0.2}$)${}_2$Se${}_3$ is revealed. Upon cooling, the density of free charge carriers in the surface states decreases whereas those in the bulk states increase, and that the newly-discovered correlated plasmons are key to explaining this phenomenon. Our result shows the importance of electronic correlation in determining new correlated plasmons and opens a new path in engineering plasmonic-based topologically-insulating devices.

References in corpus (32)

• Topological Insulators
• Superconducting proximity effect and Majorana fermions at the surface of a topological insulator
• Topological Insulators in Three Dimensions
• Topological Insulators with Inversion Symmetry
• The quantum spin Hall effect and topological insulators
• Highly confined low-loss plasmons in graphene-boron nitride heterostructures
• Control over topological insulator photocurrents with light polarization
• Two-dimensional Dirac fermions in a topological insulator: transport in the quantum limit
• Topological origin of subgap conductance in insulating bilayer graphene
• Bulk Fermi surface coexistence with Dirac surface state in Bi${}_2$Se${}_3$: a comparison of photoemission and Shubnikov-de Haas measurements
• Strong surface scattering in ultrahigh mobility Bi2Se3 topological insulator crystals
• Observation of Dirac plasmons in a topological insulator
• Rapid Surface Oxidation as a Source of Surface Degradation Factor for Bi2Se3
• Reactive chemical doping of the $B{i}_{2}S{e}_3$ topological insulator
• Probing topological insulators surface states via plasma-wave Terahertz detection
• Photoelectron spin-flipping and texture manipulation in a topological insulator
• Insulating behavior in ultra-thin bismuth selenide field effect transistors
• Measurement of an Exceptionally Weak Electron-Phonon Coupling on the Surface of the Topological Insulator Bi${}_2$Se${}_3$ Using Angle-Resolved Photoemission Spectroscopy
• Mottness: Identifying the Propagating Charge Modes in doped Mott Insulators
• Efficient nonlinear generation of THz plasmons in graphene and topological insulators
• Transport Properties of Topological Insulators: Band Bending, Bulk Metal-to-Insulator Transition, and Weak Anti-Localization
• Interface Between Topological and Superconducting Qubits
• The Nature of Electron Transport and visible light absorption in Strontium Niobate -- A Plasmonic Water Splitter
• Surface Plasmons and Topological Insulators
• Plasmons in strongly correlated systems: spectral weight transfer and renormalized dispersion
• Temperature-induced topological phase transitions: promoted vs. suppressed non-trivial topology
• Topological insulator Bi2Se3 thin films as an alternative channel material in MOSFETs
• Anisotropic optical properties of rhombohedral and tetragonal thin film BiFeO${}_3$ phases
• Generation of multiple plasmons in strontium niobates mediated by local field effects
• Termination of Single Crystal Bi2Se3 Surfaces Prepared by Various Methods
• Self-consistent iteration procedure in analyzing reflectivity and spectroscopic ellipsometry data of multilayered materials and their interfaces
• Plasmon-polaron of the topological metallic surface states