Sublattice symmetry breaking and ultra low energy excitations in Graphene-on-hBN Heterostructures

Abstract

The low-lying states of graphene contain exciting topological properties that depend on the interplay of different symmetry breaking terms. The corresponding energy gaps remained unexplored until recently, owing to the low energy scale of the terms involved (few tens of ueV). These low energy terms include sublattice splitting, the Rashba and the intrinsic spin-orbit coupling, whose balance determines the topological properties. In this work, we unravel the contributions arising from the sublattice and the intrinsic spin orbit splitting in graphene on hexagonal boron-nitride. Employing resistively-detected electron spin resonance, we measure a sublattice splitting of the order of 20E-6 eV, and confirm an intrinsic spin orbit coupling of approximately 45E-6 eV. The dominance of the latter suggests a topologically non-trivial state, involving fascinating properties. Electron spin resonance is a promising route towards unveiling the intriguing band structure at low energy scales.

References in corpus (22)

• The electronic properties of graphene
• Quantum Spin Hall Effect in Graphene
• Boron nitride substrates for high-quality graphene electronics
• $Z_2$ Topological Order and the Quantum Spin Hall Effect
• Chiral tunneling and the Klein paradox in graphene
• Massive Dirac fermions and Hofstadter butterfly in a van der Waals heterostructure
• Emergence of Superlattice Dirac Points in Graphene on Hexagonal Boron Nitride
• Structure and electronic transport in graphene wrinkles
• Origin of band gaps in graphene on hexagonal boron nitride
• Graphene with Structure-Induced Spin-Orbit Coupling: Spin-Polarized States, Spin Zero Modes, and Quantum Hall Effect
• Fractional fractal quantum Hall effect in graphene superlattices
• Electron Interactions and Gap Opening in Graphene Superlattices
• Intrinsic spin-orbit coupling gap and the evidence of a topological state in graphene
• Insulating behavior at the neutrality point in dual-gated, single-layer graphene
• Observation of Resistively Detected Hole Spin Resonance and Zero-field Pseudo-spin Splitting in Epitaxial Graphene
• Electrical spin injection, transport, and detection in graphene-hexagonal boron nitride van der Waals heterostructures: progress and perspectives
• Heterostructures of graphene and hBN: electronic, spin-orbit, and spin relaxation properties from first principles
• Observation of the spin-orbit gap in bilayer graphene by one-dimensional ballistic transport
• Probing Electron Spin Resonance in Monolayer Graphene
• Upscaling High-Quality CVD Graphene Devices to 100 Micron-Scale and Beyond
• Universal spin diffusion length in polycrystalline graphene
• The geometric phase of Z${}_n$- and T-symmetric nanomagnets as a classification toolkit

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• Atomistic theory of moiré Hofstadter's butterfly in magic-angle graphene
• Dirac imprints on the $g$-factor anisotropy in graphene
• Electric-field independent spin-orbit coupling gap in hBN-encapsulated bilayer graphene
• Nuclear-induced dephasing and signatures of hyperfine effects in isotopically purified ${}^{13}$C graphene
• Polarization amplification by spin-doping in nanomagnetic/graphene hybrid systems
• Spin-dependent photovoltage in graphene/MoS2-based field-effect transistors