Evidence for a quantum-spin-Hall phase in graphene decorated with Bi2Te3 nanoparticles

Abstract

Realization of the quantum-spin-Hall effect in graphene devices has remained an outstanding challenge dating back to the inception of the field of topological insulators. Graphene's exceptionally weak spin-orbit coupling -stemming from carbon's low mass- poses the primary obstacle. We experimentally and theoretically study artificially enhanced spin-orbit coupling in graphene via random decoration with dilute Bi2Te3 nanoparticles. Remarkably, multi-terminal resistance measurements suggest the presence of helical edge states characteristic of a quantum-spin-Hall phase; the magnetic-field and temperature dependence of the resistance peaks, X-ray photoelectron spectra, scanning tunneling spectroscopy, and first-principles calculations further support this scenario. These observations highlight a pathway to spintronics and quantum-information applications in graphene-based quantum-spin-Hall platforms.

References in corpus (31)

• Topological Insulators
• Topological insulators and superconductors
• Quantum Spin Hall Effect in Graphene
• Fault-tolerant quantum computation by anyons
• Quantum Spin Hall Effect and Topological Phase Transition in HgTe Quantum Wells
• Non-Abelian Anyons and Topological Quantum Computation
• Quantum Spin Hall Insulator State in HgTe Quantum Wells
• Van der Waals density functionals applied to solids
• Quantum Spin Hall Effect and Topological Field Effect Transistor in Two-Dimensional Transition Metal Dichalcogenides
• Bismuthene on a SiC Substrate: A Candidate for a New High-Temperature Quantum Spin Hall Paradigm
• Josephson Current and Noise at a Superconductor-Quantum Spin Hall Insulator-Superconductor Junction
• Nonlocal edge state transport in the quantum spin Hall state
• Realization of Quantum Spin Hall State in Monolayer 1T'-WTe2
• Observation of the Quantum Spin Hall Effect up to 100 Kelvin in a Monolayer Crystal
• Quantum Spin Hall Effect in Inverted Type II Semiconductors
• Topological Phases in Two-Dimensional Materials: A Brief Review
• Observation of Quantum Spin Hall States in InAs/GaSb Bilayers under Broken Time-Reversal Symmetry
• Half-Heusler Compounds as a New Class of Three-Dimensional Topological Insulators
• Spin polarization of the quantum spin Hall edge states
• Quantum spin Hall effect in three dimensional materials: Lattice computation of Z${}_2$ topological invariants and its application to Bi and Sb
• Giant topological insulator gap in graphene with 5d adatoms
• Stacked topological insulator built from bismuth-based graphene sheet analogues
• Sub-nm wide electron channels protected by topology
• Spatially resolved edge currents and guided-wave electronic states in graphene
• Edge Transport in the Trivial Phase of InAs/GaSb
• Stabilizing topological phases in graphene via random adsorption
• Edge currents shunt the insulating bulk in gapped graphene
• Absence of a transport signature of spin-orbit coupling in graphene with indium adatoms
• Transport in indium-decorated graphene
• Electronic transport properties of Ir-decorated graphene
• Spin-orbit interaction in Pt or Bi2Te3 nanoparticle-decorated graphene realized by a nanoneedle method

Cited by in corpus (20)

• Helical quantum Hall phase in graphene on SrTiO${}_3$
• Topological flat band, Dirac fermions and quantum spin Hall phase in 2D Archimedean lattices
• Electric-field-tunable valley Zeeman effect in bilayer graphene heterostructures: Realization of the spin-orbit valve effect
• Laser-beam patterned topological insulating states on thin semiconducting MoS2
• Experimental observation of spin-split energy dispersion in high-mobility single-layer graphene/WSe2 heterostructures
• Room-temperature quantum spin Hall phase in laser-patterned few-layer 1T'- MoS2
• Quantum Spin Hall Effect in Magnetic Graphene
• Volkov-Pankratov states in topological graphene nanoribbons
• Enhanced Majorana bound states in magnetic chains on superconducting topological insulator edges
• Breakdown of topological protection due to non-magnetic edge disorder in two-dimensional materials in the Quantum Spin Hall phase
• Spin-valley Hall transport induced by spontaneous symmetry breaking in half-filled zero Landau level of bilayer graphene
• Quantum spin Hall effect in III-V semiconductors at elevated temperatures: advancing topological electronics
• Gap oscillations and Majorana bound states in magnetic chains on superconducting honeycomb lattices
• Engineering metal-$s{p}_{xy}$ Dirac bands on the oxidized SiC surface
• Measurement of enhanced spin-orbit coupling strength for donor-bound electron spins in silicon
• Exploring Topological Transport in Pt${}_2$HgSe${}_3$ Nanoribbons: Insights for Spintronic Device Integration
• Harmonic generation in bent graphene with artificially-enhanced spin-orbit coupling
• In-gap states of magnetic impurity in quantum spin Hall insulator proximitized to a superconductor
• Disorder and quantum transport of the helical quantum Hall phase in graphene
• Determination of Out-of-plane Spin Polarization of Topological Surface States by Spin Hall Effect Tunneling Spectroscopy