Few-layer Nanoplates of Bi2Se3 and Bi2Te3 with Highly Tunable Chemical Potential

Abstract

Topological insulator (TI) represents an unconventional quantum phase of matter with insulating bulk bandgap and metallic surface states. Recent theoretical calculations and photoemission spectroscopy measurements show that Group V-VI materials Bi2Se3, Bi2Te3 and Sb2Te3 are TI with a single Dirac cone on the surface. These materials have anisotropic, layered structures, in which five atomic layers are covalently bonded to form a quintuple layer, and quintuple layers interact weakly through van der Waals interaction to form the crystal. A few quintuple layers of these materials are predicted to exhibit interesting surface properties. Different from our previous nanoribbon study, here we report the synthesis and characterizations of ultrathin Bi2Te3 and Bi2Se3 nanoplates with thickness down to 3 nm (3 quintuple layers), via catalyst-free vapor-solid (VS) growth mechanism. Optical images reveal thickness-dependant color and contrast for nanoplates grown on oxidized silicon (300nm SiO2/Si). As a new member of TI nanomaterials, ultrathin TI nanoplates have an extremely large surface-to-volume ratio and can be electrically gated more effectively than the bulk form, potentially enhancing surface states effects in transport measurements. Low temperature transport measurements of a single nanoplate device, with a high-k dielectric top gate, show decrease in carrier concentration by several times and large tuning of chemical potential.

arXiv comment6 figures

References in corpus (12)

• Electric Field Effect in Atomically Thin Carbon Films
• Quantum Spin Hall Effect and Topological Phase Transition in HgTe Quantum Wells
• Quantum Spin Hall Insulator State in HgTe Quantum Wells
• Topological Insulators with Inversion Symmetry
• Discovery (theoretical prediction and experimental observation) of a large-gap topological-insulator class with spin-polarized single-Dirac-cone on the surface
• A topological Dirac insulator in a quantum spin Hall phase : Experimental observation of first strong topological insulator
• First observation of Spin-Momentum Helical Locking in Bi2Se3 and Bi2Te3, demonstration of Topological-Order at 300K and a realization of topological-transport-regime
• The quantum spin Hall effect and topological insulators
• Aharonov-Bohm interference in topological insulator nanoribbons
• Topological Insulator Nanowires and Nanoribbons
• Colors Of Graphite On Silicon Dioxide
• Magnetic Doping and Kondo Effect in Bi2Se3 Nanoribbons

Cited by in corpus (45)

• Topological insulators and superconductors
• Topological Insulator Materials
• Phonon and Raman scattering of two-dimensional transition metal dichalcogenides from monolayer, multilayer to bulk material
• The Computational 2D Materials Database: High-Throughput Modeling and Discovery of Atomically Thin Crystals
• Band structure engineering in (Bi1-xSbx)2Te3 ternary topological insulators
• Quantitative Determination of the Band-Gap of WS2 with Ambipolar Ionic Liquid-Gated Transistors
• Spin Polarization and Transport of Surface States in the Topological Insulators Bi2Se3 and Bi2Te3 from First Principles
• Bulk Band Gap and Surface State Conduction Observed in Voltage-Tuned Crystals of the Topological Insulator Bi${}_2$Se${}_3$
• Vapor-Solid Growth of High Optical Quality MoS2 Monolayers With Near-Unity Valley Polarization
• Ambipolar Field Effect in Topological Insulator Nanoplates of (BixSb1-x)2Te3
• Rapid Surface Oxidation as a Source of Surface Degradation Factor for Bi2Se3
• Topological insulators for high performance terahertz to infrared applications
• Statistical Study of Deep Sub-Micron Dual-Gated Field-Effect Transistors on Monolayer CVD Molybdenum Disulfide Films
• Transport in three-dimensional topological insulators: theory and experiment
• ZT enhancement in solution-grown Sb(2-x)Bi(x)Te3 nanoplatelets
• Growth of High-Mobility Bi2Te2Se Nanoplatelets on hBN Sheets by van der Waals Epitaxy
• Synthesis of SnTe Nanoplates with {100} and {111} Surfaces
• Thermal Stability and Anisotropic Sublimation of Two-Dimensional Colloidal Bi2Te3 and Bi2Se3 Nanocrystals
• Molecular Beam Epitaxial Growth of Bi2Te3 and Sb2Te3 Topological Insulators on GaAs (111) Substrates: A Potential Route to Fabricate Topological Insulator p-n Junction
• Ordered Growth of Topological Insulator Bi2Se3 Thin Films on Dielectric Amorphous SiO2 by MBE
• 2D layered transport properties from topological insulator Bi${}_2$Se${}_3$ single crystals and micro flakes
• Electron-hole pairing in topological insulator thin film
• Growth, characterization, and transport properties of ternary (Bi1-xSbx)2Te3 topological insulator layers
• NMR Probe of Metallic States in Nanoscale Topological Insulators
• Large-Area and Transferred High-Quality Three-Dimensional Topological Insulator Bi2-xSbxTe3-ySey Ultrathin Film by Catalyst-Free Physical Vapor Deposition
• Synthesis and characterisation of nanomaterials of the topological crystalline insulator SnTe
• Stable topological insulators achieved using high energy electron beams
• Two-dimensional magnetotransport in Bi2Te2Se nanoplatelets
• Stoichiometric Bi2Se3 Topological Insulator Ultra-Thin Films Obtained Through a New Fabrication Process for Optoelectronic Applications
• Ultra-High Mechanical Flexibility of 2D Silicon Telluride
• Van der Waals epitaxial growth of topological insulator Bi${}_{2-x}$Sb${}_x$Te${}_{3-y}$Se${}_y$ ultrathin nanoplate on electrically insulating fluorophlogopite mica
• Indications of the topological transport by the universal conductance fluctuations in the Bi2Te2Se microflakes
• Nanomaterials of the topological crystalline insulators, Pb_(1-x)Sn_(x)Te and Pb_(1-x)Sn_(x)Se
• Dirac fermions at high-index surfaces of bismuth chalcogenide topological insulator nanostructures
• Phase-coherent transport in catalyst-free vapor phase deposited Bi${}_2$Se${}_3$ crystals
• MOCVD synthesis of compositionally tuned topological insulator nanowires
• Time-reversal-broken Weyl semimetal in the Hofstadter regime
• Substrate-Independent Catalyst-Free Synthesis of High-Purity Bi2Se3 Nanostructures
• Interaction proximity effect at the interface between a superconductor and a topological insulator quantum well
• Electronic properties of one-dimensional nanostructures of the Bi${}_2$Se${}_3$ topological insulator
• Pairing instabilities in topological insulator quantum wells
• Accessing topological surface states and negative MR in sculpted nanowires of Bi2Te3 at ultra-low temperature
• An ab initio investigation of Bi${}_2$Se${}_3$ topological insulator deposited on amorphous SiO${}_2$
• Quantum matter and gravitation: photons in a waveguide
• Exploring Structural and Electronic Properties of Topological Insulator/Graphene Nano-heterostructures